APPLICATION NOTES A V A I L A B L E AN99 * AN115 * AN120 * AN124 * AN133 * AN134 * AN135 Low Noise/Low Power/SPI Bus X9420 Single Digitally Controlled (XDCP) Potentiometer FEATURES DESCRIPTION * Solid-State Potentiometer * SPI serial interface * Register oriented format --Direct read/write/transfer wiper positions --Store as many as four positions per potentiometer * Power supplies --VCC = 2.7V to 5.5V --V+ = 2.7V to 5.5V --V- = -2.7V to -5.5V * Low power CMOS --Standby current < 1A * High reliability --Endurance-100,000 data changes per bit per register --Register data retention-100 years * 8-bytes of nonvolatile EEPROM memory * 10K or 2.5K resistor arrays * Resolution: 64 taps each pot * 14-lead TSSOP, 16-lead SOIC, and 16-pin plastic DIP packages The X9420 integrates a single digitally controlled potentiometers (XDCP) on a monolithic CMOS integrated microcircuit. The digitally controlled potentiometer is implemented using 63 resistive elements in a series array. Between each element are tap points connected to the wiper terminal through switches. The position of the wiper on the array is controlled by the user through the SPI bus interface. The potentiometer has associated with it a volatile Wiper Counter Register (WCR) and 4 nonvolatile Data Registers (DR0:DR3) that can be directly written to and read by the user. The contents of the WCR controls the position of the wiper on the resistor array through the switches. Power up recalls the contents of DR0 to the WCR. The XDCP can be used as a three-terminal potentiometer or as a two-terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing. BLOCK DIAGRAM HOLD CS SCK S0 SI A0 Interface and Control Circuitry R0 R1 8 Data R2 R3 Wiper Counter Register (WCR) VH/RH VL/RL VW/RW REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 1 of 20 X9420 PIN DESCRIPTIONS Potentiometer Pins Host Interface Pins VH/RH, VL/RL The VH/RH and VL/RL input are equivalent to the terminal connections on either end of a mechanical potentiometer. Serial Output (SO) SO is a push/pull serial data output pin. During a read cycle, data is shifted out on this pin. Data is clocked out by the falling edge of the serial clock. Serial Input SI is the serial data input pin. All opcodes, byte addresses and data to be written to the potentiometer and pot register are input on this pin. Data is latched by the rising edge of the serial clock. Serial Clock (SCK) The SCK input is used to clock data into and out of the X9420. Chip Select (CS) When CS is HIGH, the X9420 is deselected and the SO pin is at high impedance, and (unless an internal write cycle is underway) the device will be in the standby state. CS LOW enables the X9420, placing it in the active power mode. It should be noted that after a power-up, a HIGH to LOW transition on CS is required prior to the start of any operation. VW/RW The wiper output is equivalent to the wiper output of a mechanical potentiometer. Hardware Write Protect Input (WP) The WP pin when LOW prevents nonvolatile writes to the Data Registers. Writing to the Wiper Counter Register is not restricted. Analog Supplies (V+, V-) The analog supplies V+, V- are the supply voltages for the XDCP analog section. System/Digital Supply (VCC) VCC is the supply voltage for the system/digital section. VSS is the system ground. PIN CONFIGURATION Hold (HOLD) HOLD is used in conjunction with the CS pin to select the device. Once the part is selected and a serial sequence is underway, HOLD may be used to pause the serial communication with the controller without resetting the serial sequence. To pause, HOLD must be brought LOW while SCK is LOW. To resume communication, HOLD is brought HIGH, again while SCK is LOW. If the pause feature is not used, HOLD should be held HIGH at all times. DIP/SOIC VCC 1 16 V+ CS 2 15 NC RL/VL 3 14 A0 RH/VH 4 13 SO RW/VW 5 12 HOLD SI 6 11 SCK WP 7 10 NC VSS 8 9 X9420 V- TSSOP Device Address (A0) The address inputs is used to set the least significant bit of the 8-bit slave address. A match in the slave address serial data stream must be made with the address input in order to initiate communication with the X9420. A maximum of 2 devices may occupy the SPI serial bus. REV 1.1.6 7/30/02 www.xicor.com CS 1 14 VCC RL/VL 2 13 V+ RH/VH 3 12 A0 RW/VW 4 X9420 11 SO SI 5 10 WP 6 9 SCK VSS 7 8 V- HOLD Characteristics subject to change without notice. 2 of 20 X9420 PIN NAMES Symbol Description SCK Serial Clock SI, SO Serial Data A0 Device Address VH/RH, VL/RL Potentiometer Pins (terminal equivalent) VW/RW Potentiometer Pins (wiper equivalent) WP Hardware Write Protection HOLD Serial Communication Pause V+,V- Analog Supplies VCC System Supply Voltage VSS System Ground NC No Connection The Wiper Counter Register is a volatile register; that is, its contents are lost when the X9420 is powereddown. Although the register is automatically loaded with the value in DR0 upon power-up, this may be different from the value present at power-down. PRINCIPLES OF OPERATION The X9420 is a highly integrated microcircuit incorporating a resistor array and associated registers and counter and the serial interface logic providing direct communication between the host and the XDCP potentiometer. Serial Interface The X9420 supports the SPI interface hardware conventions. The device is accessed via the SI input with data clocked in on the rising SCK. CS must be LOW and the HOLD and WP pins must be HIGH during the entire operation. The SO and SI pins can be connected together, since they have three state outputs. This can help to reduce system pin count. Array Description The X9420 is comprised of one resistor array containing 63 discrete resistive segments that are connected in series. The physical ends of each array are equivalent to the fixed terminals of a mechanical potentiometer (VH/RH and VL/RL inputs). At both ends of the array and between each resistor segment is a CMOS switch connected to the wiper (VW/RW) output. Within the individual array only one switch may be turned on at a time. These switches are controlled by a Wiper Counter Register (WCR). The six bits of the WCR are decoded to select, and enable, one of sixty-four switches. The block diagram of the potentiometer is shown in Figure 1. REV 1.1.6 7/30/02 Wiper Counter Register (WCR) The X9420 contains a Wiper Counter Register. The WCR can be envisioned as a 6-bit parallel and serial load counter with its outputs decoded to select one of sixty-four switches along its resistor array. The contents of the WCR can be altered in four ways: it may be written directly by the host via the Write Wiper Counter Register instruction (serial load); it may be written indirectly by transferring the contents of one of four associated data registers via the XFR Data Register instruction (parallel load); it can be modified one step at a time by the Increment/ Decrement instruction. Finally, it is loaded with the contents of its data register zero (DR0) upon power-up. Data Registers The potentiometer has four 6-bit nonvolatile Data Registers. These can be read or written directly by the host. Data can also be transferred between any of the four Data Registers and the WCR. It should be noted all operations changing data in one of the Data Registers is a nonvolatile operation and will take a maximum of 10ms. If the application does not require storage of multiple settings for the potentiometer, the Data Registers can be used as regular memory locations for system parameters or user preference data. Register Descriptions Table 1. Data Registers, (6-bit), Nonvolatile 0 0 D5 D4 D3 D2 D1 (MSB) D0 (LSB) There are four 6-bit Data Registers associated with the potentiometer. - {D5~D0}: These bits are for general purpose Nonvolatile data storage or for storage of up to four different wiper values. Table 2. Wiper Counter Register, (6-bit), Volatile 0 0 WP5 WP4 WP3 WP2 WP1 WP0 (MSB) (LSB) - {WP5~WP0}: These bits specify the wiper position of the potentiometer. www.xicor.com Characteristics subject to change without notice. 3 of 20 X9420 Figure 1. Detailed Potentiometer Block Diagram Serial Data Path VH Serial Bus Input From Interface Circuitry Register 0 8 REGISTER 2 C O U N T E R Register 1 6 Parallel Bus Input Wiper Counter Register (WCR) REGISTER 3 D E C O D E INC/DEC Logic IF WCR = 00[H] THEN VW = VL IF WCR = 3F[H] THEN VW = VH UP/DN Modified SCK UP/DN VL CLK VW Write in Process The contents of the Data Registers are saved to nonvolatile memory when the CS pin goes from LOW to HIGH after a complete write sequence is received by the device. The progress of this internal write operation can be monitored by a Write In Process bit (WIP). The WIP bit is read with a Read Status command. Figure 2. Address/Identification Byte Format Device Type Identifier 0 1 0 1 1 1 0 A0 Device Address INSTRUCTIONS Address/Identification (ID) Byte The first byte sent to the X9420 from the host, following a CS going HIGH to LOW, is called the Address or Identification byte. The most significant four bits of the slave address are a device type identifier, for the X9420 this is fixed as 0101[B] (refer to Figure 2). Instruction Byte The next byte sent to the X9420 contains the instruction and register pointer information. The four most significant bits are the instruction. The next two bits point to one of four data registers. The format is shown below in Figure 3. The least significant bit in the ID byte selects one of two devices on the bus. The physical device address is defined by the state of the A0 input pin. The X9420 compares the serial data stream with the address input state; a successful compare of the address bit is required for the X9420 to successfully continue the command sequence. The A0 input can be actively driven by a CMOS input signal or tied to VCC or VSS. Figure 3. Instruction Byte Format Register Select I3 I2 I1 I0 R1 R0 0 0 Instructions The remaining three bits in the ID byte must be set to 110. REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 4 of 20 X9420 The four high order bits of the instruction byte specify the operation. The next two bits (R1 and R0) select one of the four registers that is to be acted upon when a register oriented instruction is issued. The last two bits are defined as 0. Five instructions require a three-byte sequence to complete. These instructions transfer data between the host and the X9420; either between the host and one of the Data Registers or directly between the host and the WCR. These instructions are: Two of the eight instructions are two bytes in length and end with the transmission of the instruction byte. These instructions are: - Read Wiper Counter Register--read the current wiper position of the pot, - Write Wiper Counter Register--change current wiper position of the pot, - XFR Data Register to Wiper Counter Register --This instruction transfers the contents of one specified Data Register to the Wiper Counter Register. - Read Data Register--read the contents of the selected data register; - XFR Wiper Counter Register to Data Register--This instruction transfers the contents of the Wiper Counter Register to the specified associated Data Register. - Write Data Register--write a new value to the selected data register. - Read Status--This command returns the contents of the WIP bit which indicates if the internal write cycle is in progress. The basic sequence of the two byte instructions is illustrated in Figure 4. These two-byte instructions exchange data between the WCR and one of the Data Registers. A transfer from a Data Register to a WCR is essentially a write to a static RAM, with the static RAM controlling the wiper position. The response of the wiper to this action will be delayed by tWRL. A transfer from the WCR (current wiper position), to a Data Register is a write to nonvolatile memory and takes a minimum of tWR to complete. The transfer can occur between the potentiometer and one of its associated registers. The sequence of these operations is shown in Figure 5 and Figure 6. The final command is Increment/Decrement. It is different from the other commands, because it's length is indeterminate. Once the command is issued, the master can clock the wiper up and/or down in one resistor segment steps; thereby, providing a fine tuning capability to the host. For each SCK clock pulse (tHIGH) while SI is HIGH, the selected wiper will move one resistor segment towards the VH/RH terminal. Similarly, for each SCK clock pulse while SI is LOW, the selected wiper will move one resistor segment towards the VL/RL terminal. A detailed illustration of the sequence and timing for this operation are shown in Figure 7 and Figure 8. Figure 4. Two-Byte Instruction Sequence CS SCK SI 0 REV 1.1.6 7/30/02 1 0 1 1 1 0 A0 I3 www.xicor.com I2 I1 I0 R1 R0 0 0 Characteristics subject to change without notice. 5 of 20 X9420 Figure 5. Three-Byte Instruction Sequence (Write) CS SCL SI 0 1 0 1 1 1 0 A0 I3 I2 I1 I0 R1 R0 0 0 0 0 D5 D4 D3 D2 D1 D0 Figure 6. Three-Byte Instruction Sequence (Read) CS SCL SI Don't Care 0 1 0 1 1 1 0 A0 I3 I2 I1 I0 R1 R0 0 0 S0 0 0 D5 D4 D3 D2 D1 D0 Figure 7. Increment/Decrement Instruction Sequence CS SCK SI 0 1 0 1 1 1 0 A0 I3 I2 I1 I0 0 0 0 0 I N C 1 I N C 2 I N C n D E C 1 D E C n Figure 8. Increment/Decrement Timing Limits tWRID SCK SI Voltage Out VW INC/DEC CMD Issued REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 6 of 20 X9420 Table 3. Instruction Set I3 I2 Instruction Set I1 I0 R1 R0 Read Wiper Counter Register Write Wiper Counter Register Read Data Register 1 0 0 1 0 0 0 0 Read the contents of the Wiper Counter Register 1 0 1 0 0 0 0 0 Write new value to the Wiper Counter Register 1 0 1 1 R1 R0 0 0 Write Data Register 1 1 0 0 R1 R0 0 0 XFR Data Register to Wiper Counter Register XFR Wiper Counter Register to Data Register Increment/Decrement Wiper Counter Register Read Status (WIP bit) 1 1 0 1 R1 R0 0 0 Read the contents of the Data Register pointed to by R1-R0 Write new value to the Data Register pointed to by R1-R0 Transfer the contents of the Data Register pointed to by R1-R0 to the Wiper Counter Register 1 1 1 0 R1 R0 0 0 Transfer the contents of the Wiper Counter Register to the Data Register pointed to by R1-R0 0 0 1 0 0 0 0 0 Enable Increment/decrement of the Wiper Counter Register 0 1 0 1 0 0 0 1 Read the status of the internal write cycle, by checking the WIP bit. Instruction REV 1.1.6 7/30/02 Operation www.xicor.com Characteristics subject to change without notice. 7 of 20 X9420 Instruction Format Notes: (1) "A1 ~ A0": stands for the device addresses sent by the master. (2) WPx refers to wiper position data in the Wiper Counter Register "I": stands for the increment operation, SI held HIGH during active SCK phase (high). (3) "D": stands for the decrement operation, SI held LOW during active SCK phase (high). Read Wiper Counter Register (WCR) device type device instruction wiper position identifier addresses opcode (sent by X9420 on SO) CS CS Falling Rising W W W W W W Edge 0 1 0 1 1 1 0 A 1 0 0 1 0 0 0 0 0 0 P P P P P P Edge 0 5 4 3 2 1 0 Write Wiper Counter Register (WCR) device type identifier device addresses instruction opcode Data Byte (sent by Host on SI) CS CS Falling W W W W W W Rising Edge 0 1 0 1 1 1 0 A 1 0 1 0 0 0 0 0 0 0 P P P P P P Edge 0 5 4 3 2 1 0 Read Data Register (DR) Read the contents of the Register pointed to by R1-R0. device type device instruction register Data Byte identifier addresses opcode addresses (sent by X9420 on SO) CS CS Falling Rising W W W W W W Edge 0 1 0 1 1 1 0 A 1 0 1 1 R R 0 0 0 0 P P P P P P Edge 0 1 0 5 4 3 2 1 0 Write Data Register (DR) Write a new value to the Register pointed to by R1-R0. device type device identifier addresses instruction opcode register addresses Data Byte (sent by host on SI) CS CS Falling W W W W W W Rising Edge 0 1 0 1 1 1 0 A 1 1 0 0 R R 0 0 0 0 P P P P P P Edge 0 1 0 5 4 3 2 1 0 HIGH-VOLTAGE WRITE CYCLE Transfer Data Register (DR) to Wiper Counter Register (WCR) Transfer the contents of the Register pointed to by R1-R0 to the WCR. device type device instruction register CS CS identifier addresses opcode addresses Falling Rising Edge 0 1 0 1 1 1 0 A 1 1 0 1 R R 0 0 Edge 0 1 0 REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 8 of 20 X9420 Transfer Wiper Counter Register (WCR) to Data Register (DR) device type device instruction register CS CS identifier addresses opcode addresses Falling Rising Edge 0 1 0 1 1 1 0 A 1 1 1 0 R R 0 0 Edge 0 1 0 HIGH-VOLTAGE WRITE CYCLE Increment/Decrement Wiper Counter Register (WCR) device type device instruction increment/decrement CS CS identifier addresses opcode (sent by master on SDA) Falling Rising Edge 0 1 0 1 1 1 0 A 0 0 1 0 0 0 0 0 I/D I/D . . . . I/D I/D Edge 0 Read Status device type identifier device addresses instruction opcode Data Byte (sent by X9420 on SO) CS CS Falling W Rising Edge 0 1 0 1 1 1 0 A 0 1 0 1 0 0 0 1 0 0 0 0 0 0 0 I Edge 0 P REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 9 of 20 X9420 ABSOLUTE MAXIMUM RATINGS COMMENT Temperature under bias.................... -65C to +135C Storage temperature......................... -65C to +150C Voltage on SCK, SCL or any address input with respect to VSS........... -1V to +7V Voltage on V+ (referenced to VSS) .........................10V Voltage on V- (referenced to VSS) ........................ -10V (V+) - (V-) ..............................................................12V Any VH/RH, VL/RL, VW/RW ..............................V- to V+ Lead temperature (soldering, 10 seconds) ........ 300C IW (10 seconds) ..................................................6mA Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only; functional operation of the device (at these or any other conditions above those listed in the operational sections of this specification) is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING CONDITIONS Temp Min. Max. Device Supply Voltage (VCC) Limits Commercial 0C +70C X9420 5V 10% Industrial -40C +85C X9420-2.7 2.7V to 5.5V ANALOG CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.) Symbol RTOTAL IW RW Vv+ Parameter Min. End to End Resistance Power Rating Wiper Current Wiper Resistance Voltage on V+ Pin X9420 X9420-2.7 VvVoltage on V- Pin X9420 X9420-2.7 Voltage on any VH/RH, VL/RL, VW/RW VTERM Noise Resolution(4) Absolute Linearity(1) Relative Linearity(2) Temperature Coefficient of RTOTAL Ratiometric Temperature Coefficient CH/CL/CW Potentiometer Capacitances Rh, RI, Rw leakage current IAL Limits Typ. Max. Units 150 20 50 3 250 % mW mA 40 100 +5.5 +5.5 -4.5 -2.7 V+ V +4.5 +2.7 -5.5 -5.5 V-140 1.6 1 0.2 300 20 10/10/25 0.1 10 Test Conditions 25C, each pot Wiper Current = 1mA, V+/V- = 3V Wiper Current = 1mA, V+/V- = 5V V V dBV % MI(3) MI(3) ppm/C ppm/C pF A Ref: 1kHz See Note 5 Vw(n)(actual) - Vw(n)(expected) Vw(n + 1) - [Vw(n) + MI] See Note 5 See Note 5 See Circuit #3 Vin = V- to V+. Device is in stand-by mode. Notes: (1) Absolute Linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a potentiometer. (2) Relative Linearity is utilized to determine the actual change in voltage between two successive tap positions when used as a potentiometer. It is a measure of the error in step size. (3) MI = RTOT/63 or (VH-VL)/63, single pot (4) Typical = Individual array resolution. REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 10 of 20 X9420 D.C. OPERATING CHARACTERISTICS (Over the recommended operating conditions unless otherwise specified.) Limits Symbol Parameter Min. ICC1 VCC Supply Current (Active) ICC2 Typ. Max. Units Test Conditions 400 A fSCK = 2MHz, SO = Open, Other Inputs = VSS VCC Supply Current (Non-volatile Write) 1 mA fSCK = 2MHz, SO = Open, Other Inputs = VSS ISB VCC Current (Standby) 1 A SCK = SI = VSS, Addr. = VSS ILI Input Leakage Current 10 A VIN = VSS to VCC ILO Output Leakage Current 10 A VOUT = VSS to VCC VIH Input HIGH Voltage VCC x 0.7 VCC + 0.5 V VIL Input LOW Voltage -0.5 VCC x 0.1 V VOL Output LOW Voltage 0.4 V IOL = 3mA ENDURANCE AND DATA RETENTION Parameter Min. Units Minimum Endurance 100,000 Data Changes per Bit per Register Data Retention 100 Years CAPACITANCE Symbol Test Max. Units Test Conditions Output Capacitance (SO) 8 pF VOUT = 0V Input Capacitance (A0, SI, and SCK) 6 pF VIN = 0V (5) COUT (5) CIN POWER-UP TIMING Symbol Parameter Max. Max. Units (6) tPUR Power-up to Initiation of Read Operation 1 1 ms tPUW(6) Power-up to Initiation of Write Operation 5 5 ms tRVCC VCC Power up Ramp 0.2 50 V/msec POWER UP REQUIREMENTS (Power up sequencing can affect correct recall of the wiper registers) The preferred power-on sequence is as follows: First VCC, then V+ and V-, and then the potentiometer pins, RH, RL, and RW. Voltage should not be applied to the potentiometer pins before V+ or V- is applied. The VCC ramp rate specification should be met, and any glitches or slope changes in the VCC line should be held to <100mV if possible. If VCC powers down, it should be held below 0.1V for more than 1 second before powering up again in order for proper wiper register recall. Also, VCC should not reverse polarity by more than 0.5V. Recall of wiper position will not be complete until VCC, V+ and V- reach their final value. Notes: (5) This parameter is periodically sampled and not 100% tested. (6) tPUR and tPUW are the delays required from the time the third (last) power supply (VCC, V+ or V-) is stable until the specific instruction can be issued. These parameters are periodically sampled and not 100% tested. REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 11 of 20 X9420 A.C. TEST CONDITIONS EQUIVALENT A.C. LOAD CIRCUIT Input pulse levels VCC x 0.1 to VCC x 0.9 Input rise and fall times 10ns Input and output timing level VCC x 0.5 5V 1533 SDA Output 100pF AC TIMING Symbol Parameter Min. Max. Units 2.0 MHz fSCK SSI/SPI Clock Frequency tCYC SSI/SPI Clock Cycle Time 500 ns tWH SSI/SPI Clock High Time 200 ns tWL SSI/SPI Clock Low Time 200 ns tLEAD Lead Time 250 ns tLAG Lag Time 250 ns tSU SI, SCK, HOLD and CS Input Setup Time 50 ns tH SI, SCK, HOLD and CS Input Hold Time 50 ns tRI SI, SCK, HOLD and CS Input Rise Time 2 s tFI SI, SCK, HOLD and CS Input Fall Time 2 s 500 ns 100 ns tDIS SO Output Disable Time 0 tV SO Output Valid Time tHO SO Output Hold Time tRO SO Output Rise Time 50 ns tFO SO Output Fall Time 50 ns 0 ns tHOLD HOLD Time 400 ns tHSU HOLD Setup Time 100 ns tHH HOLD Hold Time 100 ns tHZ HOLD Low to Output in High Z 100 ns tLZ HOLD High to Output in Low Z 100 ns TI Noise Suppression Time Constant at SI, SCK, HOLD and CS inputs 20 ns CS Deselect Time 2 s tWPASU WP, A0 and A1 Setup Time 0 ns tWPAH WP, A0 and A1 Hold Time 0 ns tCS REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 12 of 20 X9420 HIGH-VOLTAGE WRITE CYCLE TIMING Symbol Parameter Typ. Max. Units tWR High-voltage Write Cycle Time (Store Instructions) 5 10 ms XDCP TIMING Symbol Parameter Min. Max. Units tWRPO Wiper Response Time After The Third (Last) Power Supply Is Stable 10 s tWRL Wiper Response Time After Instruction Issued (All Load Instructions) 10 s tWRID Wiper Response Time From An Active SCL/SCK Edge (Increment/Decrement Instruction) 450 ns SYMBOL TABLE WAVEFORM REV 1.1.6 7/30/02 INPUTS OUTPUTS Must be steady Will be steady May change from Low to High Will change from Low to High May change from High to Low Will change from High to Low Don't Care: Changes Allowed N/A Changing: State Not Known Center Line is High Impedance www.xicor.com Characteristics subject to change without notice. 13 of 20 X9420 TIMING DIAGRAMS Input Timing tCS CS tLAG tCYC tLEAD SCK ... tSU tH tWL ... MSB SI tRI tFI tWH LSB High Impedance SO Output Timing CS SCK ... tV tDIS ... MSB SO SI tHO LSB ADDR Hold Timing CS tHSU tHH SCK ... tRO tFO SO tHZ tLZ SI tHOLD HOLD REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 14 of 20 X9420 XDCP Timing (for All Load Instructions) CS SCK ... tWRL ... MSB SI LSB VW SO High Impedance XDCP Timing (for Increment/Decrement Instruction) CS SCK ... tWRID ... VW SI SO ADDR Inc/Dec Inc/Dec ... High Impedance Write Protect and Device Address Pins Timing (Any Instruction) CS tWPASU tWPAH WP A0 A1 REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 15 of 20 X9420 APPLICATIONS INFORMATION Electronic potentiometers provide three powerful application advantages: (1) the variability and reliability of a solidstate potentiometer, (2) the flexibility of computer-based digital controls, and (3) the retentivity of nonvolatile memory used for the storage of multiple potentiometer settings or data. Basic Configurations of Electronic Potentiometers VR VR VH VW VL I Three terminal Potentiometer; Variable voltage divider Two terminal Variable Resistor; Variable current Basic Circuits Buffered Reference Voltage Noninverting Amplifier Cascading Techniques R1 +V +5V +V +V VS +5V VW VW X + VO - OP-07 -5V VOUT = VW - LM308A + VW R2 +V -5V R1 VW (a) Offset Voltage Adjustment Voltage Regulator VIN VO (REG) 317 R1 R2 VS - + VO 100K - VO + } TL072 R2 } Iadj VO (REG) = 1.25V (1+R2/R1)+Iadj R2 Comparator with Hysterisis VS R1 R1 R2 10K 10K +12V REV 1.1.6 7/30/02 VO = (1+R2/R1)VS (b) 10K VUL = {R1/CR1+R2} VO(max) VLL = {R1/CR1+R2} VO(min) -12V www.xicor.com Characteristics subject to change without notice. 16 of 20 X9420 PACKAGING INFORMATION 16-Lead Hermetic Dual In-Line Package Type D 0.735 (18.67) 0.775 (19.69) 0.310 (7.87) 0.220 (5.59) Pin 1 0.005 (0.13) Min. 0.700 (17.78) Ref. 0.098 (2.49) -- Seating Plane 0.200 (5.08) -- 0.070 (1.78) 0.015 (0.38) 0.150 (3.81) Min. 0.200 (5.08) 0.125 (3.18) 0.110 (2.79) 0.090 (2.29) Typ. 0.100 (2.54) 0.065 (1.65) 0.038 (0.97) Typ. 0.060 (1.52) 0.023 (0.58) 0.014 (0.36) Typ. 0.018 (0.46) 0.320 (8.13) 0.290 (7.37) Typ. 0.311 (7.90) 0 15 0.015 (0.38) 0.008 (0.20) NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 17 of 20 X9420 PACKAGING INFORMATION 16-Lead Plastic SOIC (300 Mil Body) Package Type S 0.290 (7.37) 0.299 (7.60) 0.393 (10.00) 0.420 (10.65) PIN 1 INDEX PIN 1 0.014 (0.35) 0.020 (0.51) 0.403 (10.2 ) 0.413 ( 10.5) (4X) 7 0.092 (2.35) 0.105 (2.65) 0.003 (0.10) 0.012 (0.30) 0.050 (1.27) 0.010 (0.25) 0.020 (0.50) X 45 0.050" Typical 0 - 8 0.0075 (0.19) 0.010 (0.25) 0.050" Typical 0.420" 0.015 (0.40) 0.050 (1.27) FOOTPRINT 0.030" Typical 16 Places NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 18 of 20 X9420 PACKAGING INFORMATION 14-Lead Plastic, TSSOP, Package Type V .025 (.65) BSC .169 (4.3) .252 (6.4) BSC .177 (4.5) .193 (4.9) .200 (5.1) .047 (1.20) .0075 (.19) .0118 (.30) .002 (.05) .006 (.15) .010 (.25) Gage Plane 0 - 8 Seating Plane .019 (.50) .029 (.75) Detail A (20X) .031 (.80) .041 (1.05) See Detail "A" NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 19 of 20 X9420 Ordering Information X9420 Y P T V VCC Limits Blank = 5V 10% -2.7 = 2.7 to 5.5V Device Temperature Range Blank = Commercial = 0C to +70C I = Industrial = -40C to +85C M = Military = -55C to +125C Package P = 16-Lead Plastic DIP S = 16-Lead SOIC V = 14-Lead TSSOP Potentiometer Organization W = 10K Y = 2.5K LIMITED WARRANTY (c)Xicor, Inc. 2000 Patents Pending Devices sold by Xicor, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Xicor, Inc. makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Xicor, Inc. makes no warranty of merchantability or fitness for any purpose. Xicor, Inc. reserves the right to discontinue production and change specifications and prices at any time and without notice. Xicor, Inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xicor, Inc. product. No other circuits, patents, or licenses are implied. TRADEMARK DISCLAIMER: Xicor and the Xicor logo are registered trademarks of Xicor, Inc. AutoStore, Direct Write, Block Lock, SerialFlash, MPS, and XDCP are also trademarks of Xicor, Inc. All others belong to their respective owners. U.S. PATENTS Xicor products are covered by one or more of the following U.S. Patents: 4,326,134; 4,393,481; 4,404,475; 4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846; 4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829,482; 4,874,967; 4,883,976; 4,980,859; 5,012,132; 5,003,197; 5,023,694; 5,084,667; 5,153,880; 5,153,691; 5,161,137; 5,219,774; 5,270,927; 5,324,676; 5,434,396; 5,544,103; 5,587,573; 5,835,409; 5,977,585. Foreign patents and additional patents pending. LIFE RELATED POLICY In situations where semiconductor component failure may endanger life, system designers using this product should design the system with appropriate error detection and correction, redundancy and back-up features to prevent such an occurence. Xicor's products are not authorized for use in critical components in life support devices or systems. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. REV 1.1.6 7/30/02 www.xicor.com Characteristics subject to change without notice. 20 of 20