EVALUATION KIT AVAILABLE MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners General Description The MAX15500/MAX15501 analog output conditioners provide a programmable current up to Q24mA, or a voltage up to Q12V proportional to a control voltage signal. The control voltage is typically supplied by an external DAC with an output voltage range of 0 to 4.096V for the MAX15500 and 0 to 2.5V for the MAX15501. The output current and voltage are selectable as either unipolar or bipolar. In the unipolar configuration, a control voltage of 5% full-scale (FS) produces a nominal output of 0A or 0V to achieve underrange capability. A control voltage of 100%FS produces one of two programmable levels (105%FS or 120%FS) to achieve overrange capability. The outputs of the MAX15500/MAX15501 are protected against overcurrent conditions and a short to ground or supply voltages up to Q35V. The devices also monitor for overtemperature and supply brownout conditions. The supply brownout threshold is programmable. The MAX15500/MAX15501 are programmed through an SPIK interface capable of daisy-chained operation. The MAX15500/MAX15501 provide extensive error reporting through the SPI interface and an additional open-drain interrupt output. The devices include an analog output to monitor load conditions. The MAX15500/MAX15501 operate over the -40NC to +105NC temperature range. The devices are available in a 32-pin, 5mm x 5mm TQFN package. Applications Programmable Logic Controllers (PLCs) Distributed I/Os Embedded Systems Industrial Control and Automation REFIN ERROR HANDLING FSMODE FSSEL AVSS AVSSO +4.096V 32 TQFN-EP* +2.5V MAX15501KGTJ+ 32 TQFN-EP* +2.5V Note: All devices are specified over the -40NC to +105NC operating temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. SPI is a trademark of Motorola, Inc. OUTDIS SENSEVN SENSERN SENSERP AVDDO OUT COMP AVSSO 22 21 20 19 18 17 16 N.C. 15 AGND SENSERP AVSS 28 COMP MON 29 MAX15500 MAX15501 CS1 30 CS2 31 EP* + N.C. 32 SENSEVN DGND 23 AVDD 26 AGND 27 SENSEVP AGND 24 SENSEVP 25 SENSERN OUT N.C. TOP VIEW *EXPOSED PAD. 1 2 3 4 5 6 7 8 N.C. MON 32 TQFN-EP* MAX15501GTJ+ DVDD BIDIRECTIONAL VOLTAGE DRIVER ERROR MAX15500KGTJ+ DGND ERROR HANDLING AIN OVERCURRENT PROTECTION +4.096V ERROR READY REFERENCE 32 TQFN-EP* DOUT BIDIRECTIONAL CURRENT DRIVER PIN-PACKAGE DIN SPI INTERFACE PART MAX15500GTJ+ READY AVDDO MAX15500 MAX15501 Ordering Information SCLK SCLK DIN DOUT CS1 CS2 AVDD 10V 0 to 10V 0 to 5V 20mA 0 to 20mA 4 to 20mA S Current Output Drives 0 to 1kI S Voltage Output Drives Loads Down to 1kI S HART Compliant S 2ppm Gain Error Drift Over Temperature S SPI Interface, with Daisy-Chain Capability S Supports +4.096V (MAX15500) or +2.5V (MAX15501) Full-Scale Input Signals S Extensive Error Reporting Short-Circuit and Overcurrent Protection Open-Circuit Detection Brownout Detection Overtemperature Protection S Fast, 40s Settling Time Pin Configuration Simplified Block Diagram DVDD Features S Supply Voltage Up to Q32.5V S Output Protected Up to Q35V S Programmable Output (Plus Overrange) 14 AIN 13 REFIN 12 AGND 11 FSMODE 10 FSSEL 9 OUTDIS TQFN 19-4602; Rev 2; 10/15 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ABSOLUTE MAXIMUM RATINGS AVDD to AGND......................................................-0.3V to +35V AVSS to AGND.......................................................-35V to +0.3V AVDD to AVSS.............................................................. 0 to +70V AVDD to AVDDO............................................................ 0 to +4V AVSS to AVSSO............................................................. -4V to 0V DGND to AGND....................................................-0.3V to +0.3V AVDD to DVDD..........................................................-6V to +35V DVDD to DGND.....................................................-0.3V to +6.0V CS1, CS2, SCLK, DIN, DOUT, READY, ERROR, FSMODE, MON, OUTDIS, FSSEL to DGND.......................-0.3V to +6.0V AIN, REFIN to AGND.............................................-0.3V to +6.0V SENSEVP, SENSEVN, SENSERP, SENSERN to AGND. the higher of -35V and (VAVSS - 0.3V) to the lower of (VAVDD + 0.3V) and +35V OUT, COMP to AGND... the higher of -35V and (VAVSS - 0.3V) to the lower of (VAVDD + 0.3V) and +35V Maximum Current on Pin................................................ 100mA Continuous Power Dissipation (derate 34.5mW/NC above +70NC) 32-Pin TQFN (TA = +70NC, multilayer board)..........2758.6mW Operating Temperature Range......................... -40NC to +105NC Storage Temperature Range............................. -65NC to +150NC Lead Temperature (soldering, 10s).................................+300NC Soldering Temperature (reflow).......................................+260NC Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VAVDD = +24V, VAVSS = -24V, VDVDD = 5.0V, CLOAD = 1nF, CCOMP = 0nF, VREFIN = 4.096V for the MAX15500, VREFIN = 2.5V for the MAX15501. All specifications for TA = -40NC to +105NC. Typical values are at TA = +25NC, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLY (Note 1) 5% overrange (FSMODE = DVDD) 15 24 32.5 20% overrange (FSMODE = DGND) 18.5 24 32.5 5% overrange (FSMODE = DVDD) -32.5 -24 -15 20% overrange (FSMODE = DGND) -32.5 -24 -18.5 Analog Positive Supply Voltage VAVDD Analog Negative Supply Voltage VAVSS AVDD to AVDDO Voltage Difference VAVDDO (Note 1) 2.5 V AVSS to AVSSO Voltage Difference VAVSSO (Note 1) 2.5 V Digital Supply Voltage VDVDD 2.7 Analog Positive Supply Current IAP IAP = IAVDD + IAVDDO, ILOAD = 0A Analog Negative Supply Current IAN IAN = IAVSS + IAVSSO, ILOAD = 0A Digital Supply Current 5 -7 V 5.25 V 7 mA -4.5 0.1 V mA IDVDD VDVDD = 5V Analog Positive Standby Current ISTBYP ISTBYP = IAVDD + IAVDDO, OUTDIS = DGND or software standby mode 0.4 mA 1 mA Analog Negative Standby Current ISTBYN ISTBYN = IAVSS + IAVSSO, OUTDIS = DGND or software standby mode -0.5 mA ANALOG INPUT (AIN, REFIN) Input Impedance RIN 10 kI Input Capacitance CIN 10 pF Analog Input Full Scale VAIN REFIN Full-Scale Input VREFIN 2 FSSEL = DVDD, MAX15500 4.0 4.096 4.2 FSSEL = DGND, MAX15501 2.4 2.5 2.6 FSSEL = DVDD, MAX15500 4.0 4.096 4.2 FSSEL = DGND, MAX15501 2.4 2.5 2.6 V V Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ELECTRICAL CHARACTERISTICS (continued) (VAVDD = +24V, VAVSS = -24V, VDVDD = 5.0V, CLOAD = 1nF, CCOMP = 0nF, VREFIN = 4.096V for the MAX15500, VREFIN = 2.5V for the MAX15501. All specifications for TA = -40NC to +105NC. Typical values are at TA = +25NC, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS CURRENT OUTPUT (Note 2) Maximum Load Resistance RLOAD VAVDD = +24V, VAVSS = -24V 750 VAVDD = +32.5V, VAVSS = -32.5V 1000 I Maximum Load Inductance LLOAD CCOMP = 100nF (Note 3) 15 mH Maximum Load Capacitance CLOAD CCOMP = 4.7nF 100 FF Full-scale step from 0 to 20mA or -20mA to + 20mA, RLOAD = 750I Maximum Settling Time 1% full-scale step, RLOAD = 750I Full-Scale Output Current Maxim Integrated IOUT To 0.1% accuracy, LLOAD = 20FH, CCOMP = 0nF 40 To 0.1% accuracy, LLOAD = 1mH, CCOMP = 0.15nF 500 To 0.1% accuracy, LLOAD = 10mH, CCOMP = 0.15nF 500 To 0.01% accuracy, LLOAD = 20FH, CCOMP = 0nF 60 To 0.01% accuracy, LLOAD = 10mH, CCOMP = 0.15nF 600 To 0.1% accuracy, LLOAD = 20FH, CCOMP = 0nF 20 To 0.1% accuracy, LLOAD = 1mH, CCOMP = 0.15nF 100 To 0.1% accuracy, LLOAD = 10mH, CCOMP = 0.15nF 100 To 0.01% accuracy, LLOAD = 20FH, CCOMP = 0nF 40 To 0.01% accuracy, LLOAD = 10mH, CCOMP = 0.15nF 200 Fs VFSMODE = VDVDD Q21 VFSMODE = VDGND Q24 mA 3 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ELECTRICAL CHARACTERISTICS (continued) (VAVDD = +24V, VAVSS = -24V, VDVDD = 5.0V, CLOAD = 1nF, CCOMP = 0nF, VREFIN = 4.096V for the MAX15500, VREFIN = 2.5V for the MAX15501. All specifications for TA = -40NC to +105NC. Typical values are at TA = +25NC, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN VAIN = 5% of VREFIN (unipolar mode), VAIN = 50% of VREFIN (bipolar mode) Offset Error Offset-Error Drift Gain Error GE 0.01% precision RSENSE, tested according to the ideal transfer functions shown in Table 8 MAX15500 UNITS Q0.1 Q0.5 %FS Q0.1 ppm/NC MAX15501 Q0.1 No RSENSE drift PSRR Overcurrent Limit Q0.5 Q2 ppm/NC 0.05 %FS (dIOUT/dVOUT), IOUT = 24mA, RLOAD = 750I to 0I, FSMODE = DGND, unipolar mode 1.0 FA/V At DC, VAVDD = +24V to +32.5V, VAVSS = -24V to -32.5V, VAIN = VREFIN, unipolar mode, FSMODE = DVDD 1.6 FA/V RSENSE shorted Output Current Noise Q0.51 %FS INL Output Conductance Power-Supply Rejection Ratio MAX Q5 Gain-Error Drift Integral Nonlinearity Error TYP 25 30 40 mA 0.1Hz to 10Hz 20 nARMS At 1kHz 2.6 Output Slew Rate 1.5 nA/Hz mA/Fs Small-Signal Bandwidth 30 kHz Maximum OUT Voltage to AVDDO VAVDDO - VOUT 2.0 V Minimum OUT Voltage to AVSSO VOUT - VAVSSO 2.0 V 1 kI CCOMP = 4.7nF 100 FF To 0.1% accuracy, load = 1kI in parallel with 1nF, CCOMP = 0nF 20 To 0.1% accuracy, load = 1kI in parallel with 1FF, CCOMP = 4.7nF 1000 To 0.01% accuracy, load = 1kI in parallel with 1nF, CCOMP = 0nF 30 VOLTAGE OUTPUT (RLOAD = 1kI) Minimum Resistive Load RLOAD Maximum Capacitive Load CLOAD Maximum Settling Time (FullScale Step) To 0.01% accuracy, load = 1kI in parallel with 1FF, CCOMP = 4.7nF 4 Fs 1300 Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ELECTRICAL CHARACTERISTICS (continued) (VAVDD = +24V, VAVSS = -24V, VDVDD = 5.0V, CLOAD = 1nF, CCOMP = 0nF, VREFIN = 4.096V for the MAX15500, VREFIN = 2.5V for the MAX15501. All specifications for TA = -40NC to +105NC. Typical values are at TA = +25NC, unless otherwise noted.) PARAMETER SYMBOL Maximum Settling Time (1% Full-Scale Step) Gain Error CONDITIONS MIN 10 To 0.1% accuracy, load = 1kI in parallel with 1FF, CCOMP = 4.7nF 300 To 0.01% accuracy, load = 1kI in parallel with 1nF, CCOMP = 0nF 20 To 0.01% accuracy, load = 1kI in parallel with 1FF, CCOMP = 4.7nF 600 Tested according to the ideal transfer functions shown in Table 9 Q0.1 VOUT FSMODE = DGND 5V range 5.25 10V range 10.5 5V range 6 10V range 12 VAIN = 5% of VREFIN (unipolar mode), VAIN = 50% of VREFIN (bipolar mode) Offset Error Q0.1 Offset-Error Drift Power-Supply Rejection Output-Voltage Noise Q0.5 %FS V Q0.5 %FS Q2 ppm/NC 0.05 %FS 30 FV/V 0.1Hz to 10Hz 16.3 FVRMS 1kHz 250 nV/Hz V/Fs INL PSRR UNITS ppm/NC Q2 FSMODE = DVDD Integral Nonlinearity Error MAX Fs Gain-Error Drift Full-Scale Output Voltage TYP To 0.1% accuracy, load = 1kI in parallel with 1nF, CCOMP = 0nF At DC, VAVDD = +18.5V to +32.5V, VAVSS = -18.5V to -32.5V, VAIN = VREFIN Output-Voltage Slew Rate 1.5 Short-Circuit Current 20 30 45 mA Maximum OUT Voltage to AVDDO VAVDDO - VOUT 2.0 V Minimum OUT Voltage to AVSSO VOUT - VAVSSO 2.0 V Maxim Integrated 5 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ELECTRICAL CHARACTERISTICS (continued) (VAVDD = +24V, VAVSS = -24V, VDVDD = 5.0V, CLOAD = 1nF, CCOMP = 0nF, VREFIN = 4.096V for the MAX15500, VREFIN = 2.5V for the MAX15501. All specifications for TA = -40NC to +105NC. Typical values are at TA = +25NC, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS OUTPUT MONITOR (MON) Maximum Output Voltage Current mode, see the Output Monitor section for VMON equations 3 Voltage mode, see the Output Monitor section for VMON equations 3 V Output Resistance 35 kI Overtemperature Threshold +150 NC Overtemperature Threshold Hysteresis 10 NC OVERTEMPERATURE DETECTION DIGITAL INPUTS (CS1, CS2, SCLK, DIN, OUTDIS, FSSEL, FSMODE) Input High Voltage VIH Input Low Voltage VIL Input Hysteresis 0.7 x VDVDD 0.3 x VDVDD VIHYST Input Leakage Current IIN Input Capacitance CIN V 300 VINPUT = 0V or VDVDD Q0.1 V mV Q1.0 10 FA pF DIGITAL OUTPUT (DOUT, READY) Output Low Voltage VOL ISINK = 4mA Output High Voltage VOH ISOURCE = 4mA Output Three-State Leakage IOZ DOUT only Q0.1 Output Three-State Capacitance COZ DOUT only 15 pF Output Short-Circuit Current IOSS VDVDD = 5.25V Q150 mA DIGITAL INTERRUPT (ERROR) Interrupt Active Voltage VINT ISINK = 5.0mA Interrupt Inactive Leakage IINTZ Interrupt Inactive Capacitance CINTZ Interrupt Short-Circuit Current IINTSS 6 0.4 VDVDD 0.5 V Q0.1 VDVDD = 2.7V 5 V Q10 FA 0.4 V Q1.0 FA 15 pF 30 mA Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ELECTRICAL CHARACTERISTICS (continued) (VAVDD = +24V, VAVSS = -24V, VDVDD = 5.0V, CLOAD = 1nF, CCOMP = 0nF, VREFIN = 4.096V for the MAX15500, VREFIN = 2.5V for the MAX15501. All specifications for TA = -40NC to +105NC. Typical values are at TA = +25NC, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 20 MHz TIMING CHARACTERISTICS Serial-Clock Frequency fSCLK (Note 4) 0 SCLK Pulse-Width High tCH 40% duty cycle 20 ns SCLK Pulse-Width Low tCL 60% duty cycle 20 ns CS_ Fall to SCLK Fall Setup Time tCSS To 1st SCLK falling edge 15 ns SCLK Fall to CS_ Fall Hold Time DIN to SCLK Fall Setup Time tCSH (Note 5) 0 ns tDS 15 ns DIN to SCLK Fall Hold Time tDH 0 SCLK Fall to DOUT Settle Time tDOT CLOAD = 20pF SCLK Fall to DOUT Hold Time tDOH CLOAD = 0pF SCLK Fall to DOUT Disable tDOZ 14th SCLK deassertion (Note 6) SCLK Fall to READY Fall tCR CS_ Fall to DOUT Enable tDOE CS_ Rise to DOUT Disable tCSDOZ CS_ Rise to READY Rise tCSR CS_ Pulse-Width High tCSW ns 30 2 ns ns 30 ns 16th SCLK assertion, CLOAD = 0pF or 20pF 2 30 ns Asynchronous assertion 1 35 ns Asynchronous deassertion 35 ns Asynchronous deassertion, CLOAD = 20pF 35 ns 15 ns Note 1: Use diodes as shown in the Typical Operating Circuit/Functional Diagram to ensure a voltage difference of 2V to 3.5V from AVDD to AVDDO and from AVSS to AVSSO. Note 2: RLOAD = 750I. For the MAX15500, RSENSE = 48.7I for FSMODE = DVDD and RSENSE = 42.2I for FSMODE = DGND. For the MAX15501, RSENSE = 47.3I for FSMODE = DVDD and RSENSE = 41.2I for FSMODE = DGND. See the Typical Operating Circuit/Functional Diagram. Note 3: Condition at which part is stable. Note 4: The maximum clock speed for daisy-chain applications is 10MHz. Note 5: tCSH is applied to CS_ falling to determine the 1st SCLK falling edge in a free-running SCLK application. It is also applied to CS_ rising with respect to the 15th SCLK falling edge to determine the end of the frame. Note 6: After the 14th SCLK falling edge, the MAX15500/MAX15501 outputs are high impedance and DOUT data is ignored. Maxim Integrated 7 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Typical Operating Characteristics (VAVDD = +24V, VDVDD = +5V, VAVSS = -24V, CLOAD = 1nF, 5% overrange mode, unipolar current output or bipolar voltage-output mode, VREFIN = +4.096V, TA = +25NC, unless otherwise specified.) 2.5 4 IAVDD 0 -2 -4 -6 -8 2.0 1.5 1.0 0.5 IAVSS -40 -25 -10 5 20 35 50 65 80 95 105 TEMPERATURE (NC) 20 35 50 65 80 95 105 TEMPERATURE (NC) VOLTAGE-MODE OUTPUT NOISE vs. FREQUENCY 700 MAX15500 toc04 1000 1.0 -40 -25 -10 5 20 35 50 65 80 95 105 TEMPERATURE (NC) 600 500 400 300 VAIN = 200mV UNIPOLAR CURRENT MODE (0 to 20mA) 900 OUTPUT NOISE (FV/ Hz) OUTPUT NOISE (FV/ Hz) 800 1.5 CURRENT-MODE OUTPUT NOISE vs. FREQUENCY VAIN = 0V UNIPOLAR VOLTAGE MODE (0 to 5V) 900 2.0 0 -40 -25 -10 5 1000 2.5 0.5 0 10 RLOAD = 750I CLOAD = 1FF 800 700 600 500 400 300 200 200 100 100 0 0 10 10k 100 1k FREQUENCY (Hz) 10 10k 100 1k FREQUENCY (Hz) VOLTAGE-MODE PSRR vs. SUPPLY VOLTAGE DIGITAL FEEDTHROUGH MAX15500 toc06 100 VAIN = 4.096V 90 80 70 PSRR (FV/V) SCLK 2V/div VOUT (AC-COUPLED) 1mV/div SCLK = DIN SCLK = 1MHz CS_ = HIGH VAIN = 0.5 x VREFIN 400ns/div 8 MAX15500 toc07 2 3.0 MAX15500 toc03 NO LOAD MAX15500 toc05 6 SUPPLY CURRENT (mA) 3.0 OUTPUT SLEW RATE (mA/Fs) NO LOAD OUTPUT SLEW RATE (V/Fs) 8 MAX15500 toc01 10 CURRENT-MODE OUTPUT SLEW RATE vs. TEMPERATURE MAX15500 toc02 VOLTAGE-MODE OUTPUT SLEW RATE vs. TEMPERATURE SUPPLY CURRENT vs. TEMPERATURE 60 50 40 30 20 10 0 24 26 28 30 SUPPLY VOLTAGE (V) 32 Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Typical Operating Characteristics (continued) (VAVDD = +24V, VDVDD = +5V, VAVSS = -24V, CLOAD = 1nF, 5% overrange mode, unipolar current output or bipolar voltage-output mode, VREFIN = +4.096V, TA = +25NC, unless otherwise specified.) CURRENT-MODE PSRR vs. SUPPLY VOLTAGE LOAD TRANSIENT (VOLTAGE MODE) MAX15500 toc09 MAX15500 toc08 1.0 0.9 0.8 PSRR (FA/V) 0.7 0.6 IOUT 10mA/div OmA VOUT (AC-COUPLED) 20mV/div 0.5 0.4 0.3 0.2 0.1 0 25 26 27 28 29 30 SUPPLY VOLTAGE (V) 31 32 40Fs/div FULL-SCALE OUTPUT VOLTAGE vs. TEMPERATURE LOAD TRANSIENT (CURRENT MODE) MAX15500 toc10 FULL-SCALE OUTPUT VOLTAGE (ppm/NC) 20 VOUT 10V/div O IOUT 10mA/div 0mA VAIN = 4.096V 16 12 MAX15500 toc11 24 8 4 0 -4 -8 -12 -16 -20 -40 -25 -10 5 20 35 50 65 80 95 TEMPERATURE (NC) 40Fs/div OUTPUT CURRENT DRIFT vs. TEMPERATURE 2 -2 -6 NO LOAD 1.0 0.5 IAVDD 0 -0.5 -1.0 IAVSS -1.5 -10 -2.0 -40 -25 -10 5 20 35 50 65 80 95 TEMPERATURE (NC) Maxim Integrated 1.5 SUPPLY CURRENT (mA) 6 2.0 MAX15500 toc13 VAIN = 4.096V MAX15500 toc12 OUTPUT CURRENT DRIFT (ppm/NC) 10 STANDBY SUPPLY CURRENT vs. TEMPERATURE -40 -25 -10 5 20 35 50 65 80 95 TEMPERATURE (NC) 9 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Typical Operating Characteristics (continued) (VAVDD = +24V, VDVDD = +5V, VAVSS = -24V, CLOAD = 1nF, 5% overrange mode, unipolar current output or bipolar voltage-output mode, VREFIN = +4.096V, TA = +25NC, unless otherwise specified.) GAIN vs. FREQUENCY (HART COMPLIANT) WAKEUP FROM STANDBY (CURRENT MODE) MAX15500 toc15 0 OUTDIS 2V/div 0V 5V/div VOUT 0V IOUT 10mA/div FULL-SCALE INPUT BIPOLAR VOLTAGE MODE 5% OVERRANGE BIPOLAR CURRENT MODE -4 GAIN (dB) 2V/div OUTDIS -8 -12 UNIPOLAR CURRENT MODE -16 VAIN = 40mVP-P -20 10 50Fs/div 40Fs/div SMALL-SIGNAL STEP RESPONSE (CURRENT MODE) SMALL-SIGNAL STEP RESPONSE (VOLTAGE MODE) MAX15500 toc17 35.0 34.5 SHORT-CIRCUIT CURRENT (mA) VAIN (AC-COUPLED) 50mV/div VOUT (AC-COUPLED) 100mV/div IOUT 100FA/div 100 1k 10k FREQUENCY (Hz) 100k OUTPUT SHORT-CIRCUIT CURRENT vs. TEMPERATURE MAX15500 toc18 VAIN 20mV/div MAX15500 toc16 MAX15500 toc14 VAIN = 4.096V 34.0 MAX15500 toc19 WAKEUP FROM STANDBY (VOLTAGE MODE) 33.5 33.0 32.5 32.0 31.5 31.0 30.5 30.0 5Fs/div 1Fs/div VOLTAGE-MODE MON TRANSFER CURVE vs. OUTPUT CURRENT CURRENT-MODE MON TRANSFER CURVE vs. OUTPUT VOLTAGE 2.6 2.2 MON (V) MON (V) 2.4 1.8 2.2 2.0 1.8 1.6 1.4 1.4 1.2 0 10 1 2 3 4 5 6 7 IOUT (mA) 8 9 10 11 0.9 VAIN = 4.096V 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 1.0 1.0 1.0 MAX15500 toc22 VAIN = 4.096V NO LOAD ON MON 2.8 MAXIMUM INTERNAL VOLTAGE DROP (V) 2.6 3.0 VOLTAGE-MODE MAXIMUM OUT TO AVDDO VOLTAGE vs. TEMPERATURE MAX15500 toc21 VAIN = 4.096V NO LOAD ON MON MAX15500 toc20 3.0 -40 -25 -10 5 20 35 50 65 80 95 TEMPERATURE (NC) 0 4 8 VOUT (V) 12 16 -40 -25 -10 5 20 35 50 65 80 95 TEMPERATURE (NC) Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Typical Operating Characteristics (continued) (VAVDD = +24V, VDVDD = +5V, VAVSS = -24V, CLOAD = 1nF, 5% overrange mode, unipolar current output or bipolar voltage-output mode, VREFIN = +4.096V, TA = +25NC, unless otherwise specified.) LARGE-SIGNAL SETTLING TIME (VOLTAGE MODE, RISING EDGE) CURRENT-MODE OUTPUT CONDUCTANCE vs. OUTPUT VOLTAGE 1.8 OUTPUT CONDUCTANCE (FA/V) MAX15500 toc24 MAX15500 toc23 2.0 1.6 LARGE-SIGNAL SETTLING TIME (VOLTAGE MODE, FALLING EDGE) 1.4 RL = 1kI VAIN 5V/div 1.2 1.0 CL = 1nF, CCOMP = 0nF MAX15500 toc25 VAIN 5V/div VOUT 5V/div CL = 47nF, CCOMP = 0nF 0.8 0 0.6 VOUT 5V/div 0.4 CL = 470nF, CCOMP = 4.7nF CL = 470nF, CCOMP = 4.7nF CL = 47nF, CCOMP = 0nF 0.2 CL = 1nF, CCOMP = 0nF 0 0 2 4 6 8 10 12 OUTPUT VOLTAGE (V) 14 16 LARGE-SIGNAL SETTLING TIME (VOLTAGE MODE, RISING EDGE) MAX15500 toc26 100Fs/div 100Fs/div LARGE-SIGNAL SETTLING TIME (VOLTAGE MODE, RISING EDGE) LARGE-SIGNAL SETTLING TIME (CURRENT MODE, RISING EDGE) MAX15500 toc27 RL = 1kI VAIN 5V/div RL = 1kI CL = 10FF, CCOMP = 4.7nF VOUT 5V/div VOUT CL = 100FF, CCOMP = 4.7nF CL = 100FF, CCOMP = 4.7nF LL = 1mH, CCOMP = 1nF CL = 10FF, CCOMP = 4.7nF IOUT 4mA/div 10ms/div 200Fs/div LARGE-SIGNAL SETTLING TIME (CURRENT MODE, RISING EDGE) LARGE-SIGNAL SETTLING TIME (CURRENT MODE, FALLING EDGE) LL = 22FH, CCOMP = 0nF LL = 1mH, CCOMP = 1nF Maxim Integrated LL = 22FH, CCOMP = 0.15nF RL = 20I VAIN LL = 220FH, CCOMP = 0.47nF LL = 220FH, CCOMP = 0nF LL = 1mH, CCOMP = 1nF IOUT 4mA/div IOUT 4mA/div 200Fs/div MAX15500 toc31 RL = 20I VAIN 5V/div IOUT 4mA/div LARGE-SIGNAL SETTLING TIME (CURRENT MODE, FALLING EDGE) MAX15500 toc30 MAX15500 toc29 RL = 750I VAIN 5V/div LL = 22FH, CCOMP = 0nF LL = 220FH, CCOMP = 0nF CL = 1FF, CCOMP = 4.7nF 10ms/div RL = 750I VAIN 5V/div VAIN 5V/div CL = 1FF, CCOMP = 4.7nF MAX15500 toc28 RL = 1kI 20Fs/div LL = 1mH, CCOMP = 1nF LL = 220FH, CCOMP = 0.47nF LL = 22FH, CCOMP = 0.15nF 20Fs/div 11 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Typical Operating Characteristics (continued) (VAVDD = +24V, VDVDD = +5V, VAVSS = -24V, CLOAD = 1nF, 5% overrange mode, unipolar current output or bipolar voltage-output mode, VREFIN = +4.096V, TA = +25NC, unless otherwise specified.) LARGE-SIGNAL SETTLING TIME (CURRENT MODE, RISING EDGE) MAX15500 toc32 LL = 50mH, CCOMP = 100nF MAX15500 toc34 MAX15500 toc33 RL = 750I RL = 20I RL = 750I VAIN 5V/div LL = 80mH, CCOMP = 470nF LL = 80mH, CCOMP = 470nF LL = 50mH, CCOMP = 100nF LL = 50mH, CCOMP = 100nF LL = 10mH, CCOMP = 10nF IOUT 4mA/div 100ms/div LL = 80mH, CCOMP = 470nF IOUT 4mA/div LL = 10mH, CCOMP = 10nF IOUT 4mA/div LL = 10mH, CCOMP = 10nF VAIN 5V/div 10ms/div 100ms/div LARGE-SIGNAL SETTLING TIME (CURRENT MODE, FALLING EDGE) CURRENT-MODE INL MAX15500 toc35 VOLTAGE-MODE INL RL = 20I 0.03 VAIN 20V/div LL = 10mH, CCOMP = 10nF IOUT 4mA/div 0.01 0 0.02 0.01 0 -0.01 -0.01 -0.02 -0.02 -0.03 -0.03 -0.04 -0.04 0 10ms/div 0.03 INL (%FS) LL = 50mH, CCOMP = 100nF INL (%FS) 0.02 LL = 80mH, CCOMP = 470nF 0.04 MAX15500 toc36 0.04 MAX15500 toc37 VAIN 5V/div LARGE-SIGNAL SETTLING TIME (CURRENT MODE, RISING EDGE) LARGE-SIGNAL SETTLING TIME (CURRENT MODE, FALLING EDGE) 0.6 1.2 1.8 2.4 VAIN (V) 3.0 3.6 4.2 0 1.8 2.4 VAIN (V) 3.0 3.6 4.2 MAX15500 toc39 MAX15500 toc38 IOUT 0mA 50mA/div IOUT 0mA ERROR ERROR 2V/div 2V/div 100ms/div 12 1.2 CURRENT-MODE OPEN-CIRCUIT DETECTION VOLTAGE-MODE SHORT-CIRCUIT DETECTION 50mA/div 0.6 100ms/div Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Pin Description PIN NAME 1 SCLK 2 DIN 3 DOUT SPI Data Output. Data transitions at DOUT on the falling edge of SCLK. DOUT is high impedance when either CS1 or CS2 is high. READY Active-Low Device Ready Output. READY is an active-low output that goes low when the device successfully completes processing an SPI data frame. READY returns high at the next rising edge of CS_. In daisy-chain applications, the READY output typically drives the CS_ input of the next device in the chain or a GPIO of a microcontroller. 5 ERROR Active-Low Flag Output. ERROR is an open-drain output that pulls low when output short circuit, output open circuit, overtemperature, or brownout conditions occur. ERROR typically drives an interrupt input of a microcontroller. The ERROR output is cleared after the internal error register is read through the SPI interface. Connect a 10k pullup resistor from ERROR to DVDD. The MAX15500K/MAX15501K offer enhanced error mode logic. See the Error Handling section and Figures 11a and 11b for more details. 6 DVDD Digital Power-Supply Voltage Input. Apply either a 3V or 5V nominal voltage supply to DVDD. DVDD powers the digital portion of the MAX15500/MAX15501. Bypass DVDD to DGND with a 0.1FF capacitor as close as possible to the device. Digital Ground 4 FUNCTION SPI Clock Input. Activate SCLK only when CS_ is low to minimize noise coupling. SPI Data Input. Data is clocked into the serial interface on the falling edge of SCLK. 7 DGND 8, 16, 24, 32 N.C. 9 OUTDIS Active-Low Output Disable Input. OUTDIS is an active-low logic input that forces the analog output to 0A or 0V and puts the device in standby mode when connected to DGND. Connect OUTDIS to DVDD for normal operation. 10 FSSEL Full-Scale Select Input. Connect FSSEL to DVDD for the MAX15500 when applying a +4.096V reference at REFIN. Connect FSSEL to DGND for the MAX15501 when applying a +2.50V reference at REFIN. 11 FSMODE Overrange Mode Select Input. Connect FSMODE to DVDD to set the output voltage to 105%FS when the input voltage is equal to the full-scale value. Connect FSMODE to DGND to set the output voltage to 120%FS when the input voltage is equal to the full-scale value. FSMODE has no effect in current mode. 12, 15, 27 AGND Analog Ground 13 REFIN Reference Voltage Input. Connect REFIN to an external +4.096V reference for the MAX15500 or +2.5V reference for the MAX15501. REFIN is used to set the offset for unipolar and bipolar modes. 14 AIN 17 AVSSO Negative Output Driver Supply Voltage Input. AVSSO provides power to the driver output stage. Bypass AVSSO to AVSS with a 0.1FF capacitor. Use diodes as shown in the Typical Operating Circuit/Functional Diagram to ensure a voltage difference of 2V to 3.5V between AVSS and AVSSO. 18 COMP Output Amplifier Compensation Feedback Node. Connect a compensation capacitor from COMP to OUT. See Table 10 for the recommended compensation capacitor values. Maxim Integrated No Connection. Not internally connected. Analog Signal Input. The analog input signal range at AIN is from 0V to the nominal full scale of +4.096V for the MAX15500 and +2.5V for the MAX15501. 13 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Pin Description (continued) 14 PIN NAME FUNCTION 19 OUT Analog Output. The analog voltage or current output range at OUT is programmable. See Tables 1 to 4 for possible output range settings. 20 AVDDO Positive Output Driver Supply Voltage Input. AVDDO provides power to the driver output stage. Bypass AVDDO to AVDD with a 0.1FF capacitor. Use diodes as shown in the Typical Operating Circuit/Functional Diagram to ensure a voltage difference of 2V to 3.5V between AVDD and AVDDO. 21 SENSERP Sense Resistor Positive Connection. See the Typical Operating Circuit/Functional Diagram for the typical connection. 22 SENSERN Sense Resistor Negative Connection. See the Typical Operating Circuit/Functional Diagram for the typical connection. 23 SENSEVN Kelvin Sense Voltage Negative Input. See the Typical Operating Circuit/Functional Diagram for the typical connection. 25 SENSEVP Kelvin Sense Voltage Positive Input. See the Typical Operating Circuit/Functional Diagram for the typical connection. 26 AVDD Positive Analog Supply Voltage Input. Bypass AVDD to AGND with a 0.1FF capacitor. 28 AVSS Negative Analog Supply Voltage Input. Bypass AVSS to AGND with a 0.1FF capacitor. 29 MON Load Monitoring Output. MON provides an analog 0 to 3V output. See the Output Monitor section. 30 CS1 Active-Low SPI Chip-Select Input 1. See the SPI Interface section. 31 CS2 Active-Low SPI Chip-Select Input 2. See the SPI Interface section. -- EP Exposed Pad. Internally connected to AVSS. Connect to AVSS. Connect to a large copper area to maximize thermal performance. Do not connect ground or signal lines through EP. Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Typical Operating Circuit/Functional Diagram 24V 5V 0.1FF 0.1FF 0.1FF DVDD AVDDO 10kI AIN DAC AVDD SENSEVP CABLE1 SENSERP PGA 2.5V/4.096V REF REFIN COMP OUT 10kI CCOMP RSENSE CABLE2 SENSERN RLOAD SENSEVN CLOAD CABLE3 OFFSET GENERATOR OUTPUT STAGE READ INT GPIO SPI INTERFACE/ LOGIC I/O ERROR READY FSSEL* FC POR FSMODE CS DIN SCLK CS1 CS2 DOUT DVDD OUTDIS WRITE SCLK MON BROWNOUT AGND DGND ADC MAX15500 MAX15501 TEMP MONITOR AVSSO AVSS 0.1FF DVDD 0.1FF -24V *FSSEL IS CONNECTED TO DGND FOR THE MAX15501. Maxim Integrated 15 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners _Detailed Description The MAX15500/MAX15501 output a programmable current up to Q24mA or a voltage up to Q12V proportional to a control signal at AIN. The devices operate from a dual 15V to 32.5V supply. The control voltage applied at AIN is typically supplied by an external DAC with an output voltage range of 0 to 4.096V for the MAX15500 and 0 to 2.5V for the MAX15501. The MAX15500/MAX15501 are capable of both unipolar and bipolar current and voltage outputs. In current mode, the devices produce currents of -1.2mA to +24mA or -24mA to +24mA. In voltage mode, the devices produce voltages of -0.3V to +6V, -0.6V to +12V, or Q12V. To allow for overrange and underrange capability in unipolar mode, the transfer function of the MAX15500/MAX15501 is offset such that when the voltage at AIN is 5% of full scale, IOUT is 0mA and VOUT is 0V. Once VAIN attains full scale, VOUT or IOUT becomes full scale +5% or +20% depending on the state of FSMODE. The devices are protected against overcurrent and short-circuit conditions when OUT goes to ground or a voltage up to Q32.5V. The devices also monitor for overtemperature and supply brownout conditions. The supply brownout threshold is programmable between 10V and 24V in 2V increments. The MAX15500/MAX15501 are programmed through an SPI interface with daisy-chain capability. A device ready logic output (READY) and two device select inputs (CS1 and CS2) facilitate a daisy-chain arrangement for multiple device applications. The MAX15500/MAX15501 provide Table 1. Output Values for FSMODE = DVDD, Unipolar 5% Overrange OUTPUT RANGE OUTPUT VALUES VAIN = 5%FS VAIN = FS 0 to 20mA (4mA to 20mA) 0mA 21mA 0 to 5V 0V 5.25V 0 to 10V 0V 10.5V Table 2. Output Values for FSMODE = DGND, Unipolar 20% Overrange OUTPUT RANGE OUTPUT VALUES VAIN = 5%FS VAIN = FS 0 to 20mA (4mA to 20mA) 0mA 24mA 0 to 5V 0V 6V 0 to 10V 0V 12V 16 extensive error reporting of short-circuit, open-circuit, brownout, and overtemperature conditions through the SPI interface and an additional open-drain interrupt output (ERROR). The MAX15500/MAX15501 include an analog 0 to 3V output (MON) to monitor the load condition at OUT. Analog Section The MAX15500/MAX15501 support two output modes: current and voltage. Each mode has different full-scale output values depending on the state of FSMODE as detailed in Table 1 through Table 4 and Figures 1 and 2. Use the device configuration register in Table 6 to select the desired voltage or current output range. Startup During startup, the MAX15500/MAX15501 output is set to zero and all register bits are set to zero. The devices remain in standby mode until they are configured through the SPI interface. Input Voltage Range The input voltage full-scale level is selectable between 2.5V and 4.096V using logic input FSSEL. The MAX15500 is specified for a 0 to 4.096V input voltage range, while the MAX15501 is specified for a 0 to 2.500V input voltage range. Connect FSSEL to DVDD to set the input range to 0 to 4.096V for the MAX15500. Connect FSSEL to DGND to set the input range to 0 to 2.500V for the MAX15501. Table 3. Output Values for FSMODE = DVDD, Bipolar 5% Overrange OUTPUT RANGE OUTPUT VALUES VAIN = 0V VAIN = FS Q20mA -21mA +21mA Q10V -10.5V +10.5V Table 4. Output Values for FSMODE = DGND, Bipolar 20% Overrange OUTPUT RANGE OUTPUT VALUES VAIN = 0V VAIN = FS Q20mA -24mA +24mA Q10V -12V +12V Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Output Monitor The MON output provides an analog voltage signal proportional to the output voltage in current mode and proportional to the output current in voltage mode. Use this signal to measure the system load presented to the output. The full-scale signal on MON is 3V with a typical accuracy of 10%. The signal range is typically 1.5V to 3V in unipolar mode and 0 to 3V in bipolar mode. In current mode, the MAX15500/MAX15501 program IOUT and monitor the voltage at SENSERN. VMON = 1.425V + (VSENSERN/20) RLOAD = ((VMON - 1.425V) x 20)/IOUT(PROGRAMMED) In voltage mode, the MAX15500/MAX15501 program VOUT and monitor IOUT. VMON = 1.521V + 62.4 x ILOAD RLOAD = VOUT(PROGRAMMED)/((VMON - 1.521V)/62.4) Error Handling Many industrial control systems require error detection and handling. The devices provide extensive error status reporting. An open-drain interrupt flag output, ERROR, pulls low when an error condition is detected. An error register stores the error source. Reading the error register once resets the ERROR pin but not the error register itself, allowing the system to determine the source of the error and take steps to fix the error condition. After the error condition has been fixed, read the error register for the second time to allow the device to clear the error register. Read the error register for the third time to verify if the error register has been cleared. If another error occurs after the first read, ERROR goes low again. More information on reading and clearing the error register is described in the SPI Interface section. When an output short-circuit or output open-load error occurs and disappears before the error register is read, the intermittent bit is set in the error register. The intermittent bit does not assert for brownout and overtemperature error conditions. The MAX15500/MAX15501 and MAX15500K/ MAX15501K offer different error handling for open circuits and short circuits. See the individual sections, Figure 11a, and Figure 11b for more details. Error Conditions Output Short Circuit The output short-circuit error bit asserts when the output current exceeds 30mA (typ) for longer than 260ms. In current mode, this error occurs when the sense resistor is shorted and the sense voltage is not equal to 0V. In voltage mode, this error occurs when the load is shorted to the supply or ground. The short-circuit error activates the intermittent bit in the error register if the error goes away before the error register is read. The MAX15500/MAX15501 only asserts the short-circuit flag when a short is detected and an open circuit is not detected. VOUT OR IOUT VOUT OR IOUT FS + 20% FS FS + 20% FS FS + 5% FS + 5% FSMODE = DGND FSMODE = DGND VAIN 50%FS FSMODE = DVDD FSMODE = DVDD VAIN 5%FS FS -FS -FS - 5% -FS - 20% FS Figure 1. Unipolar Transfer Function Maxim Integrated Figure 2. Bipolar Transfer Function 17 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Output Short-Circuit: Voltage Mode Only (MAX15500K/MAX15501K) The output short-circuit error bit asserts when the output current exceeds 30mA (typ) for longer than 260ms in voltage mode only. This error occurs when the load is shorted to the supply or ground. The short-circuit error activates the intermittent bit in the error register if the error goes away before the error register is read. Output Open Load (MAX15500/MAX15501) The open-circuit error bit activates when VOUT is within 30mV of AVDDO or AVSSO and there is no short-circuit current in current mode for longer than 260ms. This error activates the intermittent bit in the error register if the error goes away before the error register is read. The MAX15500/MAX15501 open-circuit flag is active when both a short circuit and open circuit are detected. The MAX15500/MAX15501 does not flag open circuit when the load current is between -3.5mA (typ) to +3.5mA (typ). Figure 11a shows the full range of the open circuit detection range and Figure 11b offers a zoomed in view. The MAX15500/MAX15501 are shown in the red lines. Output Open Load (MAX15500K/MAX15501K) The open-circuit error bit activates when VOUT is within 30mV of AVDDO or AVSSO for longer than 260ms. This error activates the intermittent bit in the error register if the error goes away before the error register is read. The MAX15500K/MAX15501K does not flag open circuit when the load current is between -0.5mA (typ) to +0.5mA (typ). Figure 11a shows the full range of the open circuit detection range and Figure 11b offers a zoomed in view. The MAX15500K/MAX15501K are shown in the green lines. Internal Overtemperature The MAX15500/MAX15501 enter standby mode if the die temperature exceeds +150NC and the overtemperature protection is enabled as shown in Table 6. When the die temperature cools down below +140NC, the error register must be read back twice to resume normal operation. The devices provide a 10NC hysteresis. The MAX15500/ MAX15501 and MAX15500K/MAX15501K all trigger the overtemperature ERROR flag in the same manner. 18 Brownout The brownout-error bit activates when the supply voltage (VAVDD or VAVSS) falls below the brownout threshold. The threshold is programmable between Q10V to Q24V in 2V steps. See Table 6 for details. The MAX15500/ MAX15501 provide a 2% hysteresis for the brownout threshold. The accuracy of the threshold is typically within 10%. During power-up, ERROR can go low and the brownout register is set. Users need to read out the error register twice to clear all the error register bits and reset ERROR to high. The MAX15500/MAX15501 and MAX15500K/MAX15501K all trigger the overtemperature ERROR flag in the same manner. Output Protection The MAX15500/MAX15501 supply inputs (AVDD, AVDDO, AVSS, and AVSSO) and sense inputs (SENSERN, SENSERP, SENSEVN, and SENSEVP) are protected against voltages up to Q35V with respect to AGND. See the Typical Operating Circuit/Functional Diagram for the recommended supply-voltage connection. SPI Interface Standard SPI Implementation The MAX15500/MAX15501 SPI interface supports daisychaining. Multiple MAX15500/MAX15501 devices can be controlled from a single 4-wire SPI interface. The MAX15500/MAX15501 feature dual CS_ inputs and an added digital output, READY, that signals when the devices finish processing the SPI frame. CS1 and CS2 are internally OR-ed. Pull both CS1 and CS2 to logic-low to activate the MAX15500/MAX15501. For a daisy-chained application, connect the CS1 input of all of the devices in the chain to the CS driver of the microcontroller. Connect the CS2 input of the first device to ground or to the CS driver of the microcontroller. Connect CS2 of the remaining devices to the READY output of the preceding device in the chain. The READY output of the last device in the chain indicates when all slave devices in the chain are configured. Connect the READY output of the last device in the chain to the microcontroller. Use the open-drain ERROR output as a wired-OR interrupt. See Figures 3 to 6. Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners TO OTHER CHIPS/CHAINS FC RPULLUP MAX15500 MAX15501 CSn CS1 CS SCLK DWRITE DREAD INT MONITOR CS2 CS1 SCLK DIN DOUT ERROR READY OPTIONAL CONNECTION Figure 3. Single Connection (Compatible with Standard SPI) TO OTHER CHIPS/CHAINS FC RPULLUP MAX15500 MAX15501 CSn CS1 CS SCLK DWRITE DREAD INT MONITOR CS2 CS1 SCLK DIN DOUT ERROR READY OPTIONAL CONNECTION Figure 4. Alternate Single Connection (Compatible with Standard SPI) TO OTHER CHIPS/CHAINS FC RPULLUP CSn CS1 CS SCLK DWRITE DREAD INT MONITOR MAX15500 MAX15501 CS2 CS1 SCLK DIN DOUT ERROR READY MAX15500 MAX15501 CS2 CS1 SCLK DIN DOUT ERROR READY MAX15500 MAX15501 OPTIONAL CONNECTION CS2 CS1 SCLK DIN DOUT ERROR READY Figure 5. Daisy-Chain Connection (Compatible with Standard SPI) Maxim Integrated 19 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners TO OTHER CHIPS/CHAINS FC RPULLUP MAX15500 MAX15501 CSn CS1 CS SCLK DWRITE DREAD INT CS2 CS1 SCLK DIN DOUT ERROR READY MAX15500 MAX15501 CS2 CS1 SCLK DIN DOUT ERROR READY SPI DEVICE CS SCLK DIN DOUT Figure 6. Daisy-Chain Terminating (Compatible with Standard SPI) Modified SPI Interface Description The SCLK, DIN, and DOUT of the MAX15500/MAX15501 assume standard SPI functionality. While the basic function of the MAX15500/MAX15501 CS_ inputs is similar to the standard SPI interface protocol, the management of the CS_ input within the chain is modified. When both CS_ inputs are low, the MAX15500/MAX15501 assume control of the DOUT line and continue to control the line until the data frame is finished and READY goes low (Figure 9). Once a complete frame is processed and the READY signal is issued, the devices do not accept any data from DIN, until either CS1 or CS2 rises and returns 20 low. A new communication cycle is initiated by a subsequent falling edge on CS1 or CS2. When either CS1 or CS2 is high, the MAX15500/MAX15501 SPI interface deactivates, DOUT returns to a high-impedance mode, READY (if active) clears, and any partial frames not yet processed are ignored. READY asserts once a valid frame is processed allowing the next device in the chain to begin processing the subsequent frame. A valid frame consists of 16 SCLK cycles following the falling edge of CS_. Once READY asserts, it remains asserted until either CS_ rises, completing the programming of the chain. Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners The MAX15500/MAX15501 relinquish control of DOUT once the devices process the frame(s). DOUT remains high impedance when the SPI interface continues to hold CS_ low beyond the required frame(s). Install a pullup/ puldown resistor at the DOUT line to maintain the desired state when DOUT goes high impedance. Single Device SPI Connection For applications using a single MAX15500 or MAX15501, connect both CS1 and CS2 inputs to the device-select driver of the host microcontroller. Alternatively, connect one of the CS_ inputs to the device-select driver of the host microcontroller and the other CS_ to DGND. Both methods allow standard SPI interface operation. See Figures 3 and 4. Daisy-Chain SPI Connection The MAX15500/MAX15501-modified SPI interface allows a single SPI master to drive multiple devices in a daisychained configuration, saving additional SPI channels for other devices and saving cost in isolated applications. Figure 5 shows multiple MAX15500/MAX15501 devices connected in a daisy chain. The chain behaves as a single device to the microcontroller in terms of timing with an expanded instruction frame requiring 16 SCLK cycles per device for complete programming. No timing parameters are affected by the READY propagation as all devices connect to the microcontroller chip-select through the CS1 inputs. A chain of MAX15500/MAX15501 devices can be terminated with any standard SPI-compatible single device without a READY output. The MAX15500/MAX15501 portion of the chain continues to display timing parameters comparable to a single device. See Figure 6. When using the MAX15500/MAX15501 with mixed chains, the connections could require some modification to accommodate the interfaces of the additional devices in the chain. Construct the daisy chain as shown in Figure 7 when using devices with similar READY outputs but without dual CS_ inputs such as the MAX5134 quad 16-bit DAC. The chain is subject to timing relaxation for parameters given with respect to CS_ rising edges to accommodate READY propagation to and through consecutive MAX5134 devices. The chain can begin and terminate with either device type. Each MAX5134 or MAX15500/MAX15501 device in the chain could be replaced by a subchain of similar devices. If the chain is terminated with a standard SPI device, omit the optional connection from READY to the Maxim Integrated monitor input on the microcontroller. The MAX15500/ MAX15501 portion of the chain continues to display timing parameters comparable to a single device. SPI Digital Specifications and Waveforms Figures 8, 9, and 10 show the operation of the modified SPI interface. The minimum programming operation typically used in single device applications is 16 SCLK periods, the minimum for a valid frame. This cycle can also represent the operation of the final device in a chain. The extended programming operation is typically used for devices in daisy-chained applications. In this case, READY drives the chip-select input of the subsequent device in the chain. The next device in the chain begins its active frame on the 16th SCLK falling edge in response to READY falling (latching DIN[13] on the 17th SCLK falling edge, if present). Aborted SPI Operations Driving a CS_ input high before a valid SPI frame is transmitted to the device can cause an erroneous command. Avoid driving CS_ high before a valid SPI frame is transmitted to the device. See Figures 9 and 10 for valid SPI operation timing. SPI Operation Definitions Input data bits DIN[13:11] represent the SPI command address while DIN[9:0] represent the data written to or read from the command address. The command address directs subsequent input data to the proper internal register for setting up the behavior of the device and selects the correct status data for readback through DOUT. Command address 0h points to a no-op command and does not impact the operation of the device. DOUT is active during this operation and reads back 00h. Command address 1h points to the configuration register used to program the MAX15500/MAX15501. Device configuration takes effect following the 14th SCLK falling edge. DOUT activates and remains low during this operation. Command addresses 4h and 5h point to readback commands of the MAX15500/MAX15501. Readback commands provide configuration and error register status through DOUT[9:0] and do not affect the internal operation of the device. Command addresses 2h, 3h, 6h, and 7h are reserved for future use. Table 5 shows the list of commands. Device Configuration Operation Table 6 shows the function of each bit written to the configuration register 1h. Table 7 shows the data readback registers. 21 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners TO OTHER CHIPS/CHAINS RPULLUP FC MAX15500 MAX15501 CSn CS1 CS SCLK DWRITE DREAD INT MONITOR CS2 CS1 SCLK DIN DOUT ERROR READY MAX15500 MAX15501 CS2 CS1 SCLK DIN DOUT ERROR READY MAX5134 CS SCLK DIN READY OPTIONAL CONNECTION Figure 7. Mixed MAX15500/MAX15501 and MAX5134 Daisy-Chain Connections ERROR REGISTER UPDATED, ERROR RE-EVALUATED COMMAND EXECUTED ACTIVE FRAME DIN X DIN13 DIN12 DIN11 DIN10 DIN9 tDS SCLK tCSH DOUT 1 2 tCSS Z 3 4 DIN8 DIN7 DIN6 tCH 5 6 DIN5 DIN4 DIN3 DIN2 DIN1 DIN0 X X X 9 10 11 12 13 14 15 16 X tCP 7 tCH 8 tCL tDOH tDOT tDOZ HIGH-Z DOUT9 DOUT8 DOUT7 DOUT6 DOUT5 DOUT4 DOUT3 DOUT2 DOUT1 DOUT0 tDOE CS_ tCSH tCSW Figure 8. Minimum SPI Programming Operation (Typically for Single Device Applications) 22 Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners ACTIVE FRAME DIN X DIN13 DIN12 DIN11 DIN10 DIN9 tDS SCLK tCSH DOUT 1 2 3 4 DIN8 DIN7 DIN6 tCH 5 6 tCSS 7 8 DIN4 DIN3 DIN2 DIN1 DIN0 X X 9 10 11 12 13 14 15 16 tDOH tCL tCH Z DIN5 X tCP X 17 tDOZ tDOT HIGH-Z DOUT9 DOUT8 DOUT7 DOUT6 DOUT5 DOUT4 DOUT3 DOUT2 DOUT1 DOUT0 tCSV tDOE CS_ tCR tCSR READY Figure 9. Extended SPI Programming Operation (Daisy-Chained Applications) ERROR REGISTER UPDATED, ERROR RE-EVALUATED SCLK tCSH DOUT 1 2 Z 4 5 6 7 8 9 10 11 12 13 14 15 16 X HIGH-Z DOUT9 tDOE CS_ 3 tCSS tCSDOZ OPERATION ABORTED Figure 10. Aborted SPI Programming Operation (Invalid, Showing tCSDOZ and Internal Activity) Readback Operations Write to the command addresses 4h or 5h to read back the configuration register data or the internal error information through DOUT[9:0]. For error readback operations, each bit corresponds to a specific error condition, with multiple bits indicating multiple error conditions present. Intermittent Errors An intermittent error is defined as an error that is detected and is resolved before the error register is read back. When the error is resolved without intervention, the intermittent bit (bit 9) is set. The output short-circuit and output open-load errors trigger the intermittent bit. Internal over- Maxim Integrated temperature and supply voltage brownout do not trigger the intermittent bit. Error Reporting Applications The ERROR output is typically connected to an interrupt input of the system microcontroller. The MAX15500/ MAX15501 only issue an interrupt when a new error condition is detected. The devices do not issue interrupts when errors (either individual or multiple) are resolved or when already reported errors persist. The system microcontroller resets ERROR when the system microcontroller reads back the error register. ERROR does not assert again unless a different error occurs. 23 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Figure 11a. Diagram Showing the MAX15500/MAX15501 "Plain" (Red) and the MAX15500K/MAX15501K (Teal) OpenCircuit Detection Windows 24 Figure 11b. Zoomed In Diagram Showing the MAX15500/ MAX15501 "Plain" (Red) and the MAX15500K/MAX15501K (Teal) Open-Circuit Detection Windows Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Table 5. SPI Commands COMMAND ADDRESS DIN[13:11] NAME DESCRIPTION 000 No-op No operation. 001 Write configuration Write device configuration register. See Table 6 for details. 010 Reserved Reserved, no operation. 011 Reserved Reserved, no operation. 100 Read error Read error register status. See Table 7 for details. 101 Read configuration Read device configuration register. See Table 6 for details. 110 Reserved Reserved, no operation. 111 Reserved Reserved, no operation. Table 6. Configuration Register LOCATION DIN[9:7] FUNCTION Mode[2:0] DIN[6:4] VBOTH[2:0] DIN[3] Thermal shutdown DIN[10], DIN[2:0] -- DESCRIPTION Sets device operating mode. 000 Mode[0]: Standby 001 Mode[1]: Bipolar current: Q20mA 010 Mode[2]: Unipolar current: 0 to 20mA 011 Mode[3]: Unipolar current: 4mA to 20mA 100 Mode[4]: Standby 101 Mode[5]: Bipolar voltage: Q10V 110 Mode[6]: Unipolar voltage: 0 to 10V 111 Mode[7]: Unipolar voltage: 0 to 5V Sets supply voltage brownout threshold for error reporting. 000: Q10V 100: Q18V 001: Q12V 101: Q20V 010: Q14V 110: Q22V 011: Q16V 111: Q24V 0 = thermal protection off. 1 = thermal protection on. Reserved Note: Modes 2h and 3h are functionally identical. Table 7. Readback Operations and Formatting DOUT BITS DESCRIPTION COMMAND ADDRESS DIN[13:11] = 101. READBACK DEVICE CONFIGURATION REGISTER DOUT[9:0] See configuration register details in Table 6. COMMAND ADDRESS DIN[13:11] = 100. READBACK ERROR REGISTER DOUT[9] Output Intermittent Fault. For details, see the Error Handling section. DOUT[8] Output Short Circuit. Output short circuit. In the MAX15500/MAX15501, this bit asserts when IOUT > 30mA in voltage and current modes for longer than 260ms. In the MAX15500K/MAX15501K, this bit asserts when Iout > 30mA for longer than 260ms (in voltage mode only). DOUT[7] Output Open Load. In the MAX15500/MAX15501, this bit asserts when VOUT is within 30mV of AVDDO or AVSSO and there is no short-circuit condition for longer than 260ms. In the MAX15500K/MAX15501K, the output open load bit asserts when VOUT is within 30mV of AVDDO or AVSSO for longer than 260ms. DOUT[6] Internal Overtemperature. This bit asserts when the die temperature exceeds +150NC. DOUT[5] Supply Brownout. This bit asserts when either supply has entered the brownout limits. See Table 6 for details. DOUT[4:0] Maxim Integrated Reserved 25 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Since the MAX15500/MAX15501 do not use a continuous clock signal, the SPI read cycles are used to cycle the error detection and reporting logic. Continue to poll the device until the error readback reports an all clear status when resolving single or multiple errors. See below for examples of typical error handling situations and the effects of the SPI read operations. 1) Error resolved by the system. a) The MAX15500/MAX15501 detect an error condition and ERROR asserts. b) The host controller reads the error register for the first time. This has the effect of resetting ERROR. The data indicates to the host processor which error is active. c) The host processor resolves the error successfully. d) The host processor reads the error register for the second time. The data still shows that the error is present as the error persisted for some time after step b and before step c. If the error is either an open load or short circuit, the intermittent bit is set. An overtemperature or a brownout does not set the intermittent bit. Reading the register a second time resets the register. e) The host reads the error register for a third time. The data now shows the error is resolved and future occurrences of this error will trigger ERROR assertion. 2) Error resolved before the host processor reads error register. b) The host controller reads the error register for the first time and resets ERROR. The data indicates to the host processor which error is active. c) The host processor takes action to resolve the error unsuccessfully. d) The host processor reads the error register for the second time. The data still shows that the error is present. e) The host processor reads the error for the third time. The data show the error to be unresolved. ERROR does not respond to the same error until the error is resolved and reported. ERROR asserts if different errors occur. Applications Information Setting the Output Gain in Current Mode In current mode, there is approximately 1.0V across the current-sensing resistors at full scale. The current sensing resistor sets the gain and is calculated as follows: RSENSE = VSENSE_FS/IMAX where VSENSE_FS is the full-scale voltage across the sense resistor. See Table 8 for values of VSENSE_FS. Output Gain in Voltage Mode The output gain in voltage mode is fixed as shown in Table 9. Selection of the Compensation Capacitor (CCOMP) a) The MAX15500/MAX15501 detect an error condition and ERROR asserts, but the error resolves itself. Use Table 10 to select the compensation capacitor. b) The host controller reads the error register for the first time resetting ERROR. The data indicates to the host processor which error is active. The data also indicates to the host that the error has been resolved since the intermittent bit is set. In the current-mode application, use Kelvin and a short connection from SENSERN and SENSERP to the RSENSE terminals to minimize gain-error drift. Balance and minimize all analog input traces for optimum performance. Layout Considerations c) The host processor reads the error register for the second time. The data still shows that the error is active. If the error is for an output fault, the data also indicates to the host that the error has been resolved since the intermittent bit is set. Reading the register a second time resets the register. 3) An error that cannot be resolved. a) The MAX15500/MAX15501 detect an error condition and ERROR asserts. 26 Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Table 8. Recommended Current Setting Components VREFIN (V) OVERRANGE (%) BIPOLAR/ UNIPOLAR MODE VSENSE_FS (V) RSENSE (I) IOUT (mA) IDEAL GAIN Unipolar 2 1.02144 42.2 24.205 0.2625/42.2 Bipolar 1 Q1.024 42.2 Q24.27 0.5/42.2 Unipolar 2 1.02144 48.7 20.97 0.2625/48.7 Bipolar 1 Q1.024 48.7 Q21.03 0.5/48.7 Unipolar 2 1.009375 41.2 24.5 0.425/41.2 Bipolar 1 Q1 41.2 Q24.27 0.8/41.2 Unipolar 2 1.009375 47.5 21.25 0.425/47.5 Bipolar 1 Q1 47.5 Q21.05 0.8/47.5 +20 4.096 +5 +20 2.500 +5 IDEAL TRANSFER FUNCTION IOUT = 0.2625 x (VAIN 0.05 x VREFIN)/42.2 IOUT = 0.5 x (VAIN - 0.5 x VREFIN)/42.2 IOUT = 0.2625 x (VAIN 0.05 x VREFIN)/48.7 IOUT = 0.5 x (VAIN - 0.5 x VREFIN)/48.7 IOUT = 0.425 x (VAIN 0.05 x VREFIN)/41.2 IOUT = 0.8 x (VAIN - 0.5 x VREFIN)/41.2 IOUT = 0.425 x (VAIN 0.05 x VREFIN)/47.5 IOUT = 0.8 x (VAIN - 0.5 x VREFIN)/47.5 Table 9. Full-Scale Output Voltages VREFIN (V) OVERRANGE (%) +20 BIPOLAR/ UNIPOLAR Unipolar Bipolar 4.096 +5 Unipolar Bipolar +20 Unipolar Bipolar 2.500 +5 Unipolar Bipolar Maxim Integrated MODE IDEAL GAIN IDEAL TRANSFER FUNCTION 7 1.5625 VOUT = 1.5625 x (VAIN - 0.05 x VREFIN) 6.08 6 3.125 VOUT = 3.125 x (VAIN - 0.05 x VREFIN) 12.16 5 6.0 7 1.375 VOUT = 1.375 x (VAIN - 0.05 x VREFIN) 5.3504 6 2.75 VOUT = 2.75 x (VAIN - 0.05 x VREFIN) 10.7008 5 5.25 VOUT = 5.25 x (VAIN - 0.5 x VREFIN) Q10.752 7 2.5125 VOUT = 2.5125 x (VAIN - 0.05 x VREFIN) 5.96719 6 5.0625 VOUT = 5.0625 x (VAIN - 0.05 x VREFIN) 12.0234 5 9.6 7 2.175 VOUT = 2.175 x (VAIN - 0.05 x VREFIN) 5.16563 6 4.425 VOUT = 4.425 x (VAIN - 0.05 x VREFIN) 10.5094 5 8.4 VOUT = 6.0 x (VAIN - 0.5 x VREFIN) VOUT = 9.6 x (VAIN - 0.5 x VREFIN) VOUT = 8.4 x (VAIN - 0.5 x VREFIN) IDEAL VOUT (V) Q12.288 Q12 Q10.5 27 MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Table 10. Recommended Compensation Capacitor for Various Load Conditions MODE CL (F) RL (kI) LL (H) CCOMP (F) Voltage 0 to 1n 1 0 0 Voltage 1n to 100n 1 0 1n Voltage 100n to 1F 1 0 2.2n Voltage 1F to 100F 1 0 4.7n Current 0 to 1n 20 to 750 0 to 20F 0 Current 0 to 1n 20 to 750 20F to 1m 2.2n Current 0 to 1n 20 to 750 1m to 50m 100n Current 1n to 100n 20 to 750 0 to 20F 1n Current 1n to 100n 20 to 750 20F to 1m 2.2n Current 1n to 100n 20 to 750 1m to 50m 100n Current 100n to 1F 20 to 750 0 to 20F 2.2n Current 100n to 1F 20F to 1m 2.2n Current 100n to 1F 20 to 750 20 to 750 1m to 50m 100n Current 1F to 100F 20 to 750 0 to 20F 2.2n Current 1F to 100F 20 to 750 20F to 1m 2.2n Current 1F to 100F 20 to 750 1m to 50m 100n CL = Load capacitance. RL = Load resistance. LL = Load inductance. CCOMP = Compensation capacitance. Chip Information PROCESS: BiCMOS 28 Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 32 TQFN-EP T3255+4 21-0140 90-0012 Maxim Integrated MAX15500/MAX15501 Industrial Analog Current/ Voltage-Output Conditioners Revision History REVISION NUMBER REVISION DATE 0 7/09 Initial release -- 1 2/11 Corrected description of DOUT pin in Pin Description section 13 2 10/15 Added new figures and text to Applications section and added "K" versions for added ERROR pin functionality. DESCRIPTION PAGES CHANGED 1, 13, 17, 18, 23, 24 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 (c) 2015 Maxim Integrated Products, Inc. 29 Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.