General Description
The MAX6964 I2C-compatible serial interfaced periph-
eral provides microprocessors with 17 output ports.
Each output is an open-drain current-sinking output
rated at 50mA and 7V. The outputs are capable of dri-
ving LEDs, or providing logic outputs with external
resistive pullup up to 7V.
Eight-bit PWM current control is also integrated. Four of
the bits are global control and apply to all LED outputs
to provide coarse adjustment of current from fully off to
fully on with 14 intensity steps. Additionally, each output
has an individual 4-bit control, which further divides the
globally set current into 16 more steps. Alternatively,
the current control can be configured as a single 8-bit
control that sets all outputs at once.
Each output has independent blink timing with two blink
phases. LEDs can be individually set to be either on or
off during either blink phase, or to ignore the blink con-
trol. The blink period is controlled by an external clock
(up to 1kHz) on BLINK or by a register. The BLINK
input can also be used as a logic control to turn the
LEDs on and off, or as a general-purpose input (GPI).
The MAX6964 supports hot insertion. The SDA, SCL,
RST, BLINK, and the slave address input ADO remain
high impedance in power-down (V+ = 0V) with up to 6V
asserted upon them. The output ports remain high
impedance with up to 8V asserted upon them.
The MAX6964 is controlled through a 2-wire I2C
serial interface, and can be configured to one of four
I2C addresses.
Applications
Features
♦400kbps, 2-Wire Serial Interface, 5.5V Tolerant
♦2V to 3.6V Operation
♦Overall 8-Bit PWM LED Intensity Control
Global 16-Step Intensity Control
Plus Individual 16-Step Intensity Controls
♦Two-Phase LED Blinking
♦High Port Output Current—Each Port 50mA (max)
♦RST Input Clears the Serial Interface and
Restores Power-Up Default State
♦Supports Hot Insertion
♦Outputs are 7V-Rated Open Drain
♦Low Standby Current (1.2µA (typ), 3.3µA (max))
♦Small 4mm x 4mm, 0.8mm High Thin QFN Package
♦-40°C to +125°C Temperature Range
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
________________________________________________________________ Maxim Integrated Products 1
O5
RST
O16
V+
SDA
SCL O10
19
20
21
22
23
24
131415161718
O9
O8
GND
O7
O6
BLINK
O15
O14
O13
O12
O11
O4
O3
O1
O0
AD0
O2
12
11
10
9
8
7
123456
TOP VIEW
QFN
MAX6964
Pin Configurations
19-3179; Rev 3; 3/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG CODE
MAX6964ATG
-40°C to +125°C
24 Thin QFN
4mm x 4mm
x 0.8mm
T2444-4
MAX6964AEG
-40°C to +125°C
24 QSOP —
Pin Configurations continued at end of data sheet.
LCD Backlights
LED Status Indication
Keypad Backlights
RGB LED Drivers
Typical Application Circuit at end of data sheet.
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
Voltage (with respect to GND)
V+ .............................................................................-0.3V to +4V
SCL, SDA, AD0, BLINK, RST ...................................-0.3V to +6V
O0–O16 ....................................................................-0.3V to +8V
DC Current on O0 to O16 ...................................................55mA
DC Current on SDA.............................................................10mA
Maximum GND Current ....................................................350mA
Continuous Power Dissipation (TA= +70°C)
24-Pin QSOP (derate 9.5mW/°C over +70°C)..............761mW
24-Pin QFN (derate 20.8mW/°C over +70°C) ............1666mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(Typical Operating Circuit, V+ = 2V to 3.6V, TA= TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25°C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Operating Supply Voltage V+
2.0 3.6
V
Output Load External Supply
Voltage VEXT 07V
TA = +25°C
1.2 2.3
TA = -40°C to +85°C 2.6
Standby Current
(Interface Idle, PWM Disabled)
I+
S C L and S D A at V + ; other
d i g i tal i np uts at V + or GN D ;
P WM i ntensi ty contr ol d i sab l ed
TA = TMIN to TMAX
3.3
µA
TA = +25°C
8.5 15.1
TA = -40°C to +85°C 16.5
Supply Current
(Interface Idle, PWM Enabled) I+
S C L and S D A at V + ; other
d i g i tal i np uts at V + or GN D ;
P WM i ntensi ty contr ol d i sab l ed
TA = TMIN to TMAX
17.2
µA
TA = +25°C
50 95.3
TA = -40°C to +85°C 99.2
Supply Current
(Interface Running, PWM
Disabled)
I+
fSCL = 400kHz; other digital
inputs at V+ or GND; PWM
intensity control enabled TA = TMIN to TMAX
102.4
µA
TA = +25°C
57 110.2
TA = -40°C to +85°C 117.4
Supply Current
(Interface Running, PWM
Enabled)
I+
fSCL = 400kHz; other digital
inputs at V+ or GND; PWM
intensity control enabled TA = TMIN to TMAX
122.1
µA
Input High Voltage
SDA, SCL, AD0, BLINK, RST VIH 0.7 x
V+
V
Input Low Voltage
SDA, SCL, AD0, BLINK, RST VIL 0.3 x
V+
V
Input Leakage Current
SDA, SCL, AD0, BLINK, RST
IIH, IIL
0 ≤ input voltage ≤ 5.5V
-0.2 +0.2
µA
Input Capacitance
SDA, SCL, AD0, BLINK, RST 8pF
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, V+ = 2V to 3.6V, TA= TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA= + 25°C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TA = +25°C
0.15 0.26
TA = -40°C to +85°C 0.3
V+ = 2V, ISINK = 20mA
TA = TMIN to TMAX
0.32
V
TA = +25°C
0.13 0.23
TA = -40°C to +85°C 0.26
V+ = 2.5V, ISINK = 20mA
TA = TMIN to TMAX
0.28
V
TA = +25°C
0.12 0.23
TA = -40°C to +85°C 0.24
Output Low Voltage
O0–O16 VOL
V+ = 3.3V, ISINK = 20mA
TA = TMIN to TMAX
0.26
V
Output Low-Voltage SDA
VOLSDA
ISINK = 6mA
0.4
V
PWM Clock Frequency fPWM 32
kHz
TIMING CHARACTERISTICS
(Typical Operating Circuit, V+ = 2V to 3.6V, TA= TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25°C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Serial Clock Frequency fSCL
400
kHz
Bus Free Time Between a STOP and a START
Condition tBUF
1.3
µs
Hold Time, Repeated START Condition
tHD
,
STA 0.6
µs
Repeated START Condition Setup Time
tSU
,
STA 0.6
µs
STOP Condition Setup Time
tSU
,
STO 0.6
µs
Data Hold Time
tHD
,
DAT
(Note 2)
0.9
µs
Data Setup Time
tSU
,
DAT 180
ns
SCL Clock Low Period tLOW
1.3
µs
SCL Clock High Period tHIGH
0.7
µs
Rise Time of Both SDA and SCL Signals, Receiving
tR(Notes 3, 4) 20 +
0.1Cb300
ns
Fall Time of Both SDA and SCL Signals, Receiving tF(Notes 3, 4) 20 +
0.1Cb300
ns
Fall Time of SDA Transmitting tF.TX (Notes 3, 5) 20 +
0.1Cb250
ns
Pulse Width of Spike Suppressed tSP (Note 6) 50 ns
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
4 _______________________________________________________________________________________
PORT OUTPUT LOW VOLTAGE WITH 50mA
LOAD CURRENT vs. TEMPERATURE
PORT OUTPUT LOW VOLTAGE VOL (V)
0.1
0.2
0.3
0.4
0.5
0.6
0
MAX6964 toc04
TEMPERATURE (°C)
1109565 80-10 5 20 35 50-25-40 125
V+ = 3.6V
V+ = 2.7V
V+ = 2V
PORT OUTPUT LOW VOLTAGE WITH 20mA
LOAD CURRENT vs. TEMPERATURE
MAX6964 toc05
TEMPERATURE (°C)
PORT OUTPUT LOW VOLTAGE VOL (V)
1109580655035205-10-25
0.1
0.2
0.3
0.4
0.5
0.6
0
-40 125
ALL OUTPUTS LOADED
V+ = 3.6V
V+ = 2.7V
V+ = 2V
PWM CLOCK FREQUENCY
vs. TEMPERATURE
MAX6964 toc06
TEMPERATURE (°C)
PWM CLOCK FREQUENCY (kHz)
1109580655035205-10-25-40 125
V+ = 3.6V
V+ = 2.7V V+ = 2V
0.925
0.950
0.975
1.000
1.025
1.050
0.900
NORMALIZED TO V+ = 3.3V, TA = 25°C
STANDBY CURRENT vs. TEMPERATURE
MAX6964 toc01
TEMPERATURE (°C)
STANDBY CURRENT (µA)
1109565 80-10 520 35 50-25
1
2
3
4
5
6
7
8
9
10
0
-40 125
V+ = 3.6V
PWM ENABLED
V+ = 2.7V
PWM ENABLED
V+ = 2V
PWM DISABLED
V+ = 2.7V
PWM DISABLED
V+ = 3.6V
PWM
DISABLED
V+ = 2V
PWM ENABLED
SUPPLY CURRENT vs. TEMPERATURE
(PWM DISABLED; fSCL = 400kHz)
MAX6964 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
1109565 80-10 5 20 35 50-25
10
20
30
40
50
60
70
0
-40 125
V+ = 3.6V
V+ = 2.7V
V+ = 2V
5
10
15
20
25
30
35
40
45
50
55
60
65
70
0
SUPPLY CURRENT vs. TEMPERATURE
(PWM ENABLED; fSCL = 400kHz)
MAX6964 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
1109565 80-10 5 20 35 50-25-40 125
V+ = 3.6V
V+ = 2.7V
V+ = 2V
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
TIMING CHARACTERISTICS (continued)
(Typical Operating Circuit, V+ = 2V to 3.6V, TA= TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25°C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Capacitive Load for Each Bus Line Cb(Note 3)
400
pF
RST Pulse Width tW1ns
Output Data Valid tDV Figure 10 5 ns
Note 1: All parameters tested at TA= +25°C. Specifications over temperature are guaranteed by design.
Note 2: A master device must provide a hold time of at least 300ns for the SDA signal (referred to VIL of the SCL signal) to bridge
the undefined region of SCL’s falling edge.
Note 3: Guaranteed by design.
Note 4: Cb= total capacitance of one bus line in pF. tRand tFmeasured between 0.3 x VDD and 0.7 x VDD.
Note 5: ISINK ≤6mA. Cb= total capacitance of one bus line in pF. tRand tFmeasured between 0.3 x VDD and 0.7 x VDD.
Note 6: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
_______________________________________________________________________________________ 5
SCOPE SHOT OF OUTPUT PORTS
MAX6964 toc07
2ms/div
OUTPUT 1,
2V/div
OUTPUT 2,
2V/div
OUTPUT 1 INDIVIDUAL INTENSITY
SET TO 1/16
MASTER INTENSITY SET TO 14/15
OUTPUT 2 INDIVIDUAL INTENSITY
SET TO 14/15
SCOPE SHOT OF OUTPUT PORTS
MAX6964 toc08
2ms/div
OUTPUT 1
2V/div
OUTPUT 2
2V/div
MASTER INTENSITY SET TO 1/15
OUTPUT 1 INDIVIDUAL INTENSITY
SET TO 1/16
OUTPUT 2 INDIVIDUAL INTENSITY
SET TO 15/16
SINK CURRENT vs. VOL
MAX6964 toc09
SINK CURRENT (mA)
VOL (V)
40302010
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0
050
V+ = 3.6V
V+ = 3.3V
V+ = 2V
V+ = 2.7V
ONLY ONE OUTPUT LOADED
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
PIN
QSOP QFN NAME FUNCTION
1, 4–11, 13–20
1–8, 10–17, 22
O0-O16 Output Ports. Open-drain outputs rated at 7V, 50mA.
223RST Reset Input. Active low clears the 2-wire interface and puts the device in the
same condition as power-up reset.
3 24 AD0 Address Input. Sets device slave address. Connect to either GND, V+, SCL, or
SDA to give 4 logic combinations. See Table 1.
12 9 GND Ground. Do not sink more than 350mA into the GND pin.
21 18 BLINK Input Port. Configurable as blink control or general-purpose input.
22 19 SCL I2C-Compatible Serial Clock Input
23 20 SDA I2C-Compatible Serial Data I/O
24 21 V+
Positive Supply Voltage. Bypass V+ to GND with a 0.047µF ceramic capacitor.
— Pad
Exposed Pad
Exposed pad on package underside. Connect to GND.
Pin Description
MAX6964
Functional Overview
The MAX6964 is a general-purpose output (GPO)
peripheral that provides 17 output ports, O0–O16, con-
trolled through an I2C-compatible serial interface. All
outputs sink loads up to 50mA connected to external
supplies up to 7V, independent of the MAX6964’s sup-
ply voltage. The MAX6964 is rated for a ground current
of 350mA, allowing all 17 outputs to sink 20mA at the
same time. Figure 1 shows the output structure of the
MAX6964. The outputs default to logic high (high
impedance unless external pullup resistors are used)
on power-up.
Output Control and LED Blinking
The two blink phase 0 registers set the output logic lev-
els of the 16 outputs O0–O15 (Table 6). These registers
control the port outputs if the blink function is disabled.
A duplicate pair of registers, the blink phase 1 regis-
ters, are also used if the blink function is enabled
(Table 7). In blink mode, the outputs can be flipped
between using the blink phase 0 registers, and the
blink phase 1 registers using hardware control (the
BLINK input) and/or software control (the blink flip flag
in the configuration register) (Table 4).
The 17th output, O16, is controlled through 2 bits in the
configuration register, which provide the same static or
blink control as the other 16 outputs (Table 4).
The logic level of the BLINK input may be read back
through the blink status bit in the configuration register
(Table 4). The BLINK input, therefore, may be used as
a general-purpose logic input (GPI port) if the blink
function is not required.
PWM Intensity Control
The MAX6964 includes an internal oscillator, nominally
32kHz, to generate PWM timing for LED intensity con-
trol. PWM intensity control can be enabled on an out-
put-by-output basis, allowing the MAX6964 to provide
any mix of PWM LED drives and glitch-free logic out-
puts (Table 8). PWM can be disabled entirely, in which
case all outputs are static and the MAX6964 operating
current is lowest because the internal oscillator is
turned off.
PWM intensity control uses a 4-bit master control and 4
bits of individual control per output (Tables 11 and 12).
The 4-bit master control provides 16 levels of overall
intensity control, which applies to all PWM-enabled out-
puts. The master control sets the maximum pulse width
from 1/15 to 15/15 of the PWM time period. The individ-
ual settings comprise a 4-bit number, further reducing
the duty cycle to be from 1/16 to 15/16 of the time win-
dow set by the master control.
For applications requiring the same PWM setting for all
output ports, a single global PWM control can be used
instead of all the individual controls to simplify the con-
trol software and provide 240 steps of intensity control
(Tables 8 and 11).
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
6 _______________________________________________________________________________________
Figure 1. Simplified Schematic of I/O Ports
DATA FROM
SHIFT REGISTER
WRITE PULSE
D
CK
Q
Q
FF
OUTPUT
PORT
REGISTER
I/O PIN
Q2
GND
OUTPUT PORT
REGISTER DATA
Figure 2. 2-Wire Serial Interface Timing Details
SCL
SDA
tRtF
tBUF
START
CONDITION
STOP
CONDITION
REPEATED START CONDITION
START CONDITION
tSU,STO
tHD,STA
tSU,STA
tHD,DAT
tSU,DAT
tLOW
tHIGH
tHD,STA
User RAM
The MAX6964 includes 2 register bytes, which are
available as general-user RAM (Table 2). These bytes
are reset to the value 0xFF on power-up and when the
RST input is taken low (Table 3).
Standby Mode
When the serial interface is idle and the PWM intensity
control is unused, the MAX6964 automatically enters
standby mode. If the PWM intensity control is used, the
operating current is slightly higher because the internal
PWM oscillator is running. When the serial interface is
active, the operating current also increases because
the MAX6964, like all I2C slaves, has to monitor every
transmission.
Serial Interface
Serial Addressing
The MAX6964 operates as a slave that sends and
receives data through an I2C-compatible 2-wire inter-
face. The interface uses a serial data line (SDA) and a
serial clock line (SCL) to achieve bidirectional commu-
nication between master(s) and slave(s). A master (typ-
ically a microcontroller) initiates all data transfers to and
from the MAX6964 and generates the SCL clock that
synchronizes the data transfer (Figure 2).
The MAX6964 SDA line operates as both an input and
an open-drain output. A pullup resistor, typically 4.7kΩ,
is required on SDA. The MAX6964 SCL line operates
only as an input. A pullup resistor, typically 4.7kΩ, is
required on SCL if there are multiple masters on the 2-
wire interface, or if the master in a single-master system
has an open-drain SCL output.
Each transmission consists of a START condition
(Figure 3) sent by a master, followed by the MAX6964
7-bit slave address plus R/Wbit, a register address
byte, 1 or more data bytes, and finally a STOP condi-
tion (Figure 3).
Start and Stop Conditions
Both SCL and SDA remain high when the interface is
not busy. A master signals the beginning of a transmis-
sion with a START (S) condition by transitioning SDA
from high to low while SCL is high. When the master
has finished communicating with the slave, it issues a
STOP (P) condition by transitioning SDA from low to
high while SCL is high. The bus is then free for another
transmission (Figure 3).
Bit Transfer
One data bit is transferred during each clock pulse.
The data on SDA must remain stable while SCL is high
(Figure 4).
Acknowledge
The acknowledge bit is a clocked 9th bit that the recipi-
ent uses to handshake receipt of each byte of data
(Figure 5). Thus, each byte transferred effectively
requires 9 bits. The master generates the 9th clock
pulse, and the recipient pulls down SDA during the
acknowledge clock pulse so the SDA line is stable low
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
_______________________________________________________________________________________ 7
Figure 3. Start and Stop Conditions
SDA
SCL
START
CONDITION
STOP
CONDITION
SP
Figure 4. Bit Transfer
SDA
SCL
DATA LINE STABLE;
DATA VALID
CHANGE OF DATA
ALLOWED
Figure 5. Acknowledge
SCL
SDA BY
TRANSMITTER
CLOCK PULSE
FOR ACKNOWLEDGE
START
CONDITION
SDA BY
RECEIVER
12 89
S
Figure 6. Slave Address
SDA
SCL
1
MSB LSB
ACK00A6 0 0A2 R/W
MAX6964
during the high period of the clock pulse. When the
master is transmitting to the MAX6964, the device gen-
erates the acknowledge bit because the MAX6964 is
the recipient. When the MAX6964 is transmitting to the
master, the master generates the acknowledge bit
because the master is the recipient.
Slave Address
The MAX6964 has a 7-bit long slave address (Figure 6).
The eighth bit following the 7-bit slave address is the
R/Wbit. The R/Wbit is low for a write command, high
for a read command.
The second (A5), third (A4), fourth (A3), sixth (A1), and
last (A0) bits of the MAX6964 slave address are always
1, 0, 0, 0, and 0. Slave address bits A6 and A2 are
selected by the address input AD0. AD0 can be con-
nected to GND, V+, SDA, or SCL. The MAX6964 has
four possible slave addresses (Table 1), and therefore
a maximum of four MAX6964 devices can be controlled
independently from the same interface.
Message Format for Writing the MAX6964
A write to the MAX6964 comprises the transmission of
the MAX6964’s slave address with the R/Wbit set to
zero, followed by at least 1 byte of information. The first
byte of information is the command byte. The command
byte determines which register of the MAX6964 is to be
written to by the next byte, if received (Table 2). If a
STOP condition is detected after the command byte is
received, then the MAX6964 takes no further action
beyond storing the command byte.
Any bytes received after the command byte are data
bytes. The first data byte goes into the internal register of
the MAX6964 selected by the command byte (Figure 8).
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
8 _______________________________________________________________________________________
Table 1. MAX6964 Address Map
DEVICE ADDRESS
PIN AD0 A6 A5 A4 A3 A2 A1 A0
SCL1100000
SDA1100100
GND0100000
V+0100100
Table 2. Register Address Map
REGISTER ADDRESS CODE
(hex)
AUTOINCREMENT
ADDRESS
Blink phase 0 outputs O7–O0 0x02 0x03
Blink phase 0 outputs O15–O8 0x03 0x02
User RAM0 0x06 0x07
User RAM1 0x07 0x06
Blink phase 1 outputs O7–O0 0x0A 0x0B
Blink phase 1 outputs O15–O8 0x0B 0x0A
Master and global/O16 intensity 0x0E —
Configuration 0x0F —
Outputs intensity O1, O0 0x10 0x11
Outputs intensity O3, O2 0x11 0x12
Outputs intensity O5, O4 0x12 0x13
Outputs intensity O7, O6 0x13 0x14
Outputs intensity O9, O8 0x14 0x15
Outputs intensity O11, O10 0x15 0x16
Outputs intensity O13, O12 0x16 0x17
Outputs intensity O15, O14 0x17 0x10
If multiple data bytes are transmitted before a STOP con-
dition is detected, these bytes are generally stored in
subsequent MAX6964 internal registers because the
command byte address autoincrements (Table 2). A
diagram of a write to the output ports registers (blink
phase 0 registers or blink phase 1 registers) is given in
Figure 10.
Message Format for Reading
The MAX6964 is read using the MAX6964’s internally
stored command byte as an address pointer the same
way the stored command byte is used as an address
pointer for a write. The pointer autoincrements after
each data byte is read using the same rules as for a
write (Table 2). Thus, a read is initiated by first configur-
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
_______________________________________________________________________________________ 9
Figure 8. Command and Single Data Byte Received
SAAAP0
SLAVE ADDRESS COMMAND BYTE DATA BYTE
1
BYTE
AUTOINCREMENT MEMORY ADDRESS
D15 D14 D13 D12 D11 D10 D9 D8 D1 D0D3 D2D5 D4D7 D6
ACKNOWLEDGE FROM MAX6964 ACKNOWLEDGE FROM MAX6964
ACKNOWLEDGE FROM MAX6964
HOW COMMAND BYTE AND DATA BYTE MAP INTO
MAX6964's REGISTERS
R/W
Figure 9. n Data Bytes Received
SAAAP0SLAVE ADDRESS COMMAND BYTE DATA BYTE
N
BYTE
AUTOINCREMENT MEMORY ADDRESS
D15 D14 D13 D12 D11 D10 D9 D8 D1 D0D3 D2D5 D4D7 D6
ACKNOWLEDGE FROM MAX6964 ACKNOWLEDGE FROM MAX6964
ACKNOWLEDGE FROM MAX6964
HOW COMMAND BYTE AND DATA BYTE MAP INTO
MAX6964's REGISTERS
R/W
Figure 7. Command Byte Received
SAA
P
0SLAVE ADDRESS COMMAND BYTE
ACKNOWLEDGE FROM MAX6964
D15 D14 D13 D12 D11 D10 D9 D8
COMMAND BYTE IS STORED ON RECEIPT OF
STOP CONDITION
ACKNOWLEDGE FROM MAX6964
R/W
Figure 10. Write Timing Diagram
SLAVE ADDRESS
123456789
SA6A5A4A3A2A1A00A0 000000
COMMAND BYTE
1A A AP
START CONDITION ACKNOWLEDGE FROM SLAVE ACKNOWLEDGE FROM SLAVE ACKNOWLEDGE FROM SLAVE STOP
CONDITION
O7–O0
O15– O8
DATA1 VALID
DATA2 VALID
tDV
tDV
SCL
SDA
WRITE TO OUTPUT PORTS REGISTERS (BLINK PHASE 0 REGISTERS/BLINK PHASE 1 REGISTERS)
R/W
MSB LSBDATA1 MSB LSBDATA2
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
10 ______________________________________________________________________________________
ing the MAX6964’s command byte by performing a
write (Figure 7). The master can now read n consecu-
tive bytes from the MAX6964 with the first data byte
being read from the register addressed by the initial-
ized command byte. When performing read-after-write
verification, remember to reset the command byte’s
address because the stored command byte address
has been autoincremented after the write (Table 2).
Operation with Multiple Masters
If the MAX6964 is operated on a 2-wire interface with
multiple masters, a master reading the MAX6964 should
use a repeated start between the write, which sets the
MAX6964’s address pointer, and the read(s) that takes
the data from the location(s) (Table 2). This is because it
is possible for master 2 to take over the bus after master
1 has set up the MAX6964’s address pointer but before
master 1 has read the data. If master 2 subsequently
changes the MAX6964’s address pointer, then master
1’s delayed read can be from an unexpected location.
Command Address Autoincrementing
The command address stored in the MAX6964 circu-
lates around grouped register functions after each data
byte is written or read (Table 2).
Device Reset
The reset input RST is an active-low input. When taken
low, RST clears any transaction to or from the MAX6964
on the serial interface and configures the internal regis-
ters to the same state as a power-up reset (Table 3).
The MAX6964 then waits for a START condition on the
serial interface.
Detailed Description
Initial Power-Up
On power-up, and whenever the RST input is pulled
low, all control registers are reset and the MAX6964
enters standby mode (Table 3). Power-up status makes
all outputs logic high (high impedance if external pullup
resistors are not fitted) and disables both the PWM
oscillator and blink functionality. The RST input can be
used as a hardware shutdown input, which effectively
turns off any LED (or other) loads and puts the device
into its lowest power condition.
Configuration Register
The configuration register is used to configure the PWM
intensity mode and blink behavior, operate the O16 out-
put, and read back the BLINK input logic level (Table 4).
Blink Mode
In blink mode, the outputs can be flipped between
using either the blink phase 0 registers or the blink
phase 1 registers. Flip control is both hardware (the
BLINK input) and software control (the blink flip flag B
in the configuration register) (Table 4).
The blink function can be used for LED effects by pro-
gramming different display patterns in the two sets of
output port registers, and using the software or hard-
ware controls to flip between the patterns.
If the blink phase 1 registers are written with 0xFF, then
the BLINK input can be used as a hardware disable to,
for example, instantly turn off an LED pattern pro-
grammed into the blink phase 0 registers. This tech-
nique can be further extended by driving the BLINK
input with a PWM signal to modulate the LED current to
provide fading effects.
The blink mode is enabled by setting the blink enable
flag E in the configuration register (Table 4). When blink
mode is enabled, the state of the blink flip flag and
BLINK input are EXORed to set the phase, and the out-
puts are set by either the blink phase 0 registers or the
blink phase 1 registers (Figure 11, Table 5).
The blink mode is disabled by clearing the blink enable
flag E in the configuration register (Table 4). When blink
mode is disabled, the state of the blink flip flag is
ignored, and the blink phase 0 registers alone control
the outputs.
The logic status of BLINK is made available as the read-
only blink status flag blink in the configuration register
(Table 4). This flag allows BLINK to be used as an extra
general-purpose input (GPI) in applications not using the
blink function. When BLINK is going to be used as a GPI,
blink mode should be disabled by clearing the blink
enable flag E in the configuration register (Table 4).
Blink Phase Registers
When the blink function is disabled, the two blink phase
0 registers set the logic levels of the 16 outputs (O0
through O15) (Table 6). A duplicate pair of registers
called the blink phase 1 registers are also used if the
blink function is enabled (Table 7). A logic high sets the
appropriate output high impedance, while a logic low
makes the port go low.
Reading a blink phase register reads the value stored
in the register, not the actual port condition. The port
output itself may or may not be at a valid logic level,
depending on the external load connected.
The 17th output, O16, is controlled through 2 bits in the
configuration register, which provide the same static or
blink control as the other 16 output ports.
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
______________________________________________________________________________________ 11
Table 3. Power-Up Configuration
REGISTER DATA
REGISTER FUNCTION POWER-UP CONDITION
ADDRESS
CODE
(hex)
D7 D6 D5 D4 D3 D2 D1
D0
Blink phase 0 outputs O7–O0
High-impedance outputs 0x02
1111111
1
Blink phase 0 outputs O15–O8
High-impedance outputs 0x03
1111111
1
User RAM0 0xFF 0x06
1111111
1
User RAM1 0xFF 0x07
1111111
1
Blink phase 1 outputs O7–O0
High-impedance outputs 0x0A
1111111
1
Blink phase 1 outputs O15–O8
High-impedance outputs 0x0B
1111111
1
Master and global/O16
intensity
PWM oscillator is disabled;
O16 is static logic output 0x0E
0000111
1
Configuration
O16 is high-impedance output;
blink is disabled;
global intensity is enabled
0x0F
0011010
0
Outputs intensity O1, O0
O1, O0 are static logic outputs
0x10
1111111
1
Outputs intensity O3, O2
O3, O2 are static logic outputs
0x11
1111111
1
Outputs intensity O5, O4
O5, O4 are static logic outputs
0x12
1111111
1
Outputs intensity O7, O6
O7, O6 are static logic outputs
0x13
1111111
1
Outputs intensity O9, O8
O9, O8 are static logic outputs
0x14
1111111
1
Outputs intensity O11, O10
O11, O10 are static logic outputs
0x15
1111111
1
Outputs intensity O13, O12
O13, O12 are static logic outputs
0x16
1111111
1
Outputs intensity O15, O14
O15, O14 are static logic outputs
0x17
1111111
1
Table 4. Configuration Register
REGISTER DATA
REGISTER
ADDRESS
CODE
(hex) D7 D6 D5 D4 D3 D2 D1 D0
CONFIGURATION
R/W
0
BLINK
STATUS
OUTPUT
O16
0
GLOBAL
INTENSITY
BLINK FLIP
BLINK
ENABLE
Write device configuration
0
XX
Read back device configuration
1
0
BLINK O1
O0 0GBE
Disable blink
—
XXXXXXX0
Enable blink
—
XXXXXXX1
—
XXXXXX01
Flip blink register (see text)
—
0x0F
XXXXXX11
X = Don’t care.
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
12 ______________________________________________________________________________________
Table 4. Configuration Register (continued)
REGISTER DATA
REGISTER
ADDRESS
CODE
(hex) D7 D6 D5 D4 D3 D2 D1 D0
CONFIGURATION
R/W
0
BLINK
STATUS
OUTPUT
O16
0
GLOBAL
INTENSITY
BLINK FLIP
BLINK
ENABLE
Write device configuration
0
XX
Read back device configuration
1
0
BLINK O1
O0 0GBE
Disable global intensity control—intensity
is set by registers 0x10–0x17 for ports O0
through O15 when configured as outputs,
and by D3–D0 of register 0x0E for output
—
XXXXX0XX
Enable global intensity control—intensity
for all ports configured as outputs is set
by D3–D0 of register 0x0E
—
XXXXX1XX
O16 output is low (blink is disabled)
—
XXX00XX0
O16 output is high impedance (blink is
disabled)
—
XXX10XX0
O 16 outp ut i s l ow d ur i ng b l i nk p hase 0
—
XXX00XX1
O16 output is high impedance during
blink phase 0
—
XXX10XX1
O 16 outp ut i s l ow d ur i ng b l i nk p hase 1
—
XX0X0XX1
O16 output is high impedance during
blink phase 1
—
XX1X0XX1
Read back BLINK input pin status;
input is low
1
X0XXXXXX
Read back BLINK input pin status;
input is high
1
0x0F
X1XXXXXX
Table 5. Blink Controls
BLINK ENABLE
FLAG
E
BLINK FLIP
FLAG
B
BLINK INPUT
PIN
BLINK FLIP FLAG
EXOR
BLINK INPUT PIN
BLINK
FUNCTION
OUTPUT REGISTERS
USED
0 X X X Disabled Blink phase 0
0 0 0 Blink phase 0
0 1 1 Blink phase 1
1 0 1 Blink phase 1
1
11 0
Enabled
Blink phase 0
X = Don’t care.
X = Don’t care.
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
______________________________________________________________________________________ 13
Table 6. Blink Phase 0 Registers
REGISTER DATA
REGISTER
R/W
ADDRESS
CODE
(hex) D7 D6 D5 D4 D3 D2 D1 D0
Write outputs O7–O0 phase 0
0
Read back outputs O7–O0 phase 0
1
0x02
OP7 OP6 OP5 OP4 OP3 OP2 OP1
OP0
Write outputs O15–O8 phase 0
0
Read back outputs O15–O8 phase 0
1
0x03
OP15 OP14 OP13 OP12 OP11 OP10 OP9
OP8
Table 7. Blink Phase 1 Registers
REGISTER DATA
REGISTER
R/W
ADDRESS
CODE
(hex) D7 D6 D5 D4 D3 D2 D1 D0
Write outputs O7–O0 phase 1
0
Read back outputs O7–O0 phase 1
1
0x0A
OP7 OP6 OP5 OP4 OP3 OP2 OP1
OP0
Write outputs O15–O8 phase 1
0
Read back outputs O15–O8 phase 1
1
0x0B
OP15 OP14 OP13 OP12 OP11 OP10 OP9
OP8
Table 8. PWM Application Scenarios
APPLICATION RECOMMENDED CONFIGURATION
All outputs static without PWM
Set the master and global intensity register 0x0E to any value from 0x00 to 0x0F.
The global intensity G bit in the configuration register is don't care.
The output intensity registers 0x10 through 0x17 are don't care.
A mix of static and PWM outputs, with PWM
outputs using different PWM settings
Set the master and global intensity register 0x0E to any value from 0x10 to 0xFF.
Clear global intensity G bit to zero in the configuration register to disable global
intensity control.
For the static outputs, set the output intensity value to 0xF.
For the PWM outputs, set the output intensity value in the range 0x0 to 0xE.
A mix of static and PWM outputs, with PWM
outputs all using the same PWM setting
As above. Global intensity control cannot be used with a mix of static and PWM
outputs, so write the individual intensity registers with the same PWM value.
All outputs PWM using the same PWM
setting
Set the master and global intensity register 0x0E to any value from 0x10 to 0xFF.
Set global intensity G bit to 1 in the configuration register to enable global intensity
control.
The master and global intensity register 0x0E is the only intensity register used.
The output intensity registers 0x10 through 0x17 are don't care.
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
14 ______________________________________________________________________________________
PWM Intensity Control
The MAX6964 includes an internal oscillator, nominally
32kHz, to generate PWM timing for LED intensity control
or other applications such as PWM trim DACs. PWM can
be disabled entirely for all the outputs. In this case, all
outputs are static and the MAX6964 operating current is
lowest because the internal PWM oscillator is turned off.
The MAX6964 can be configured to provide any combi-
nation of PWM outputs and glitch-free logic outputs.
Each PWM output has an individual 4-bit intensity con-
trol (Table 12). When all outputs are to be used with the
same PWM setting, the outputs can be controlled
together instead using the global intensity control
(Table 11). Table 8 shows how to set up the MAX6964
to suit a particular application.
PWM Timing
The PWM control uses a 240-step PWM period, divided
into 15 master intensity timeslots. Each master intensity
timeslot is divided further into 16 PWM cycles (Figure 12).
The master intensity operates as a gate, allowing the indi-
vidual output settings to be enabled from 1 to 15 timeslots
per PWM period (Figures 13, 14, and 15) (Table 11).
Each output’s individual 4-bit intensity control only
operates during the number of timeslots gated by the
master intensity. The individual controls provide 16
intensity settings from 1/16 through 16/16 (Table 12).
Figures 16, 17, and 18 show examples of individual
intensity control settings. The highest value an individ-
ual or global setting can be set to is 16/16. This setting
forces the output to ignore the master control, and fol-
low the logic level set by the appropriate blink phase
register bit. The output becomes a glitch-free static out-
put with no PWM.
Using PWM Intensity Controls with Blink Disabled
When blink is disabled (Table 5), the blink phase 0 regis-
ters specify each output’s logic level during the PWM on-
time (Table 6). The effect of setting an output’s blink
phase 0 register bit to zero or 1 is shown in Table 9. With
its output bit set to zero, an LED can be controlled with 16
intensity settings from 1/16th duty through fully on, but
cannot be turned fully off using the PWM intensity control.
With its output bit set to 1, an LED can be controlled with
16 intensity settings from fully off through 15/16th duty.
Using PWM Intensity Controls with Blink Enabled
When blink is enabled (Table 5), the blink phase 0 regis-
ters and blink phase 1 registers specify each output’s
logic level during the PWM on-time during the respective
blink phases (Tables 6 and 7). The effect of setting an
output’s blink phase x register bit to 0 or 1 is shown in
Table 10. LEDs can be flipped between either directly on
and off, or between a variety of high/low PWM intensities.
Global/O16 Intensity Control
The 4 bits used for output O16’s PWM individual inten-
sity setting also double as the global intensity control
(Table 11). Global intensity simplifies the PWM settings
when the application requires them all to be the same,
such as for backlight applications, by replacing the 17
individual settings with one setting. Global intensity is
Figure 12. PWM Timing
ONE PWM PERIOD IS 240 CYCLES OF THE 32kHz PWM
OSCILLATOR; A PWM PERIOD CONTAINS 15 MASTER
INTENSITY TIMESLOTS
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 14 15 1 2
EACH MASTER INTENSITY
TIMESLOT CONTAINS 16
PWM CYCLES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 15 16 1 2
Figure 11. BLINK Logic
BLINK ENABLE FLAG E
BLINK FLIP FLAG B
BLINK INPUT
BLINK PHASE
REGISTERS
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
______________________________________________________________________________________ 15
enabled with the global intensity flag G in the configu-
ration register (Table 4). When global PWM control is
used, the 4 bits of master intensity and 4 bits of global
intensity effectively combine to provide an 8-bit, 240-
step intensity control applying to all outputs.
It is not possible to apply global PWM control to a sub-
set of the ports, and use the others as logic outputs. To
mix static logic outputs and PWM outputs, individual
PWM control must be selected (Table 8).
Applications Information
Hot Insertion
The RST input, BLINK input, and serial interface SDA,
SCL, AD0 remain high impedance with up to 6V assert-
ed on them when the MAX6964 is powered down (V+ =
0V). Ouptut ports O0–O16 remain high impedance with
up to 8V asserted on them. The MAX6964 can therefore
be used in hot-swap applications.
Output Level Translation
The open-drain output architecture allows the ports to
level translate the outputs to higher or lower voltages
than the MAX6964 supply. An external pullup resistor
can be used on any output to convert the high-imped-
ance logic-high condition to a positive voltage level.
The resistor can be connected to any voltage up to 7V.
For interfacing CMOS inputs, a pullup resistor value of
220kΩis a good starting point. Use a lower resistance
to improve noise immunity, in applications where power
consumption is less critical, or where a faster rise time
is needed for a given capacitive load.
Driving LED Loads
When driving LEDs, a resistor in series with the LED
must be used to limit the LED current to no more than
50mA. Choose the resistor value according to the fol-
lowing formula:
RLED = (VSUPPLY - VLED - VOL) / ILED
where:
RLED is the resistance of the resistor in series with the
LED (Ω).
VSUPPLY is the supply voltage used to drive the LED (V).
VLED is the forward voltage of the LED (V).
VOL is the output low voltage of the MAX6964 when
sinking ILED (V).
ILED is the desired operating current of the LED (A).
Figure 15. Master Set to 15/15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 14 15 2 1
.
.
Figure 14. Master Set to 14/15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 14 15 2 1
.
.
Figure 13. Master Set to 1/15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 14 15 2 1
.
Figure 17. Individual (or Global) Set to 15/16
MASTER INTENSITY TIMESLOT
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
NEXT MASTER INTENSITY TIMESLOT
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Figure 16. Individual (or Global) Set to 1/16
MASTER INTENSITY TIMESLOT
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
NEXT MASTER INTENSITY TIMESLOT
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Figure 18. Individual (or Global) Set to 16/16
MASTER INTENSITY TIMESLOT CONTROL IS IGNORED
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
For example, to operate a 2.2V red LED at 14mA from a
5V supply, RLED = (5 - 2.2 - 0.25) / 0.014 = 182Ω.
Driving Load Currents Higher than 50mA
The MAX6964 can be used to drive loads drawing
more than 50mA, like relays and high-current white
LEDs, by paralleling outputs. Use at least one output
per 50mA of load current; for example, a 6V 330mW
relay draws 55mA and needs two paralleled outputs to
drive it. Ensure that the paralleled outputs chosen are
controlled by the same blink phase register, i.e., select
outputs from the O0 through O7 range, or the O8
through O15 range. This way, the paralleled outputs
are turned on and off together. Do not use output O16
as part of a load-sharing design. O16 cannot be
switched at the same time as any of the other outputs
because it is controlled by a different register.
The MAX6964 must be protected from the negative
voltage transient generated when switching off induc-
tive loads, such as relays, by connecting a reverse-
biased diode across the inductive load (Figure 19). The
peak current through the diode is the inductive load’s
operating current.
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
16 ______________________________________________________________________________________
Table 9. PWM Intensity Settings (Blink Disabled)
PWM DUTY CYCLE
OUTPUT BLINK PHASE 0
REGISTER BIT = 0
PWM DUTY CYCLE
OUTPUT BLINK PHASE 0
REGISTER = 1
OUTPUT
(OR
GLOBAL)
INTENSITY
SETTING
LOW TIME HIGH TIME
LED BEHAVIOR WHEN
OUTPUT BLINK PHASE 0
REGISTER BIT = 0
(LED IS ON WHEN
OUTPUT IS LOW)
LOW TIME HIGH TIME
LED BEHAVIOR WHEN
OUTPUT BLINK PHASE 0
REGISTER BIT = 1
(LED IS ON WHEN
OUTPUT IS LOW)
0x0 1/16 15/16 Lowest PWM intensity 15/16 1/16 Highest PWM intensity
0x1 2/16 14/16 14/16 2/16
0x2 3/16 13/16 13/16 3/16
0x3 4/16 12/16 12/16 4/16
0x4 5/16 11/16 11/16 5/16
0x5 6/16 10/16 10/16 6/16
0x6 7/16 9/16 9/16 7/16
0x7 8/16 8/16 8/16 8/16
0x8 9/16 7/16 7/16 9/16
0x9 10/16 6/16 6/16 10/16
0xA 11/16 5/16 5/16 11/16
0xB 12/16 4/16 4/16 12/16
0xC 13/16 3/16 3/16 13/16
0xD 14/16 2/16
Increasing PWM intensity
2/16 14/16
Increasing PWM intensity
0xE 15/16 1/16 Highest PWM intensity 1/16 15/16 Lowest PWM intensity
0xF
Static low Static low
Full intensity, no PWM
(LED on continuously)
Static high
impedance
Static high
impedance
LED off continuously
Figure 19. Diode-Protected Switching Inductive Load
MAX6964
O8
O10
O0
O1
O2
O3
O4
O5
O6
O7
V+
2V TO 3.6V
µC
SDA
SCL
BLINK
SDA
I/O
AD0
O11
O12
O13
O14
O15
SCL
I/O
O9
GND
0.047µF
RST
MMTBT4148
5V
Power-Supply Considerations
The MAX6964 operates with a power-supply voltage of
2V to 3.6V. Bypass the power supply to GND with at
least 0.047µF as close to the device as possible. For
the QFN version, connect the underside exposed pad
to GND.
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
______________________________________________________________________________________ 17
Table 10. PWM Intensity Settings (Blink Enabled)
EXAMPLES OF LED BLINK BEHAVIOR
(LED IS ON WHEN OUTPUT IS LOW)
PWM DUTY CYCLE
OUTPUT BLINK
PHASE X
REGISTER BIT = 0
PWM DUTY CYCLE
OUTPUT BLINK
PHASE X
REGISTER = 1
OUTPUT
(OR
GLOBAL)
INTENSITY
SETTING
LOW
TIME
HIGH
TIME
LOW
TIME
HIGH
TIME
BLINK PHASE 0
REGISTER BIT = 0
BLINK PHASE 1
REGISTER BIT = 1
BLINK PHASE 0
REGISTER BIT = 1
BLINK PHASE 1
REGISTER BIT = 0
0x0 1/16 15/16 15/16 1/16
0x1 2/16 14/16 14/16 2/16
0x2 3/16 13/16 13/16 3/16
0x3 4/16 12/16 12/16 4/16
0x4 5/16 11/16 11/16 5/16
0x5 6/16 10/16 10/16 6/16
0x6 7/16 9/16 9/16 7/16
P hase 0: LE D on at l ow i ntensi ty
P hase 1: LE D on at hi g h i ntensi ty
P hase 0: LE D on at hi g h i ntensi ty
P hase 1: LE D on at l ow i ntensi ty
0x7 8/16 8/16 8/16 8/16 Output is half intensity during both blink phases
0x8 9/16 7/16 7/16 9/16
0x9 10/16 6/16 6/16 10/16
0xA 11/16 5/16 5/16 11/16
0xB 12/16 4/16 4/16 12/16
0xC 13/16 3/16 3/16 13/16
0xD 14/16 2/16 2/16 14/16
0xE 15/16 1/16 1/16 15/16
P hase 0: LE D on at hi g h i ntensi ty
P hase 1: LE D on at l ow i ntensi ty
P hase 0: LE D on at l ow i ntensi ty
P hase 1: LE D on at hi g h i ntensi ty
0xF
Static low Static low
Static high
impedance
Static high
impedance
Phase 0: LED on continuously
Phase 1: LED off continuously
Phase 0: LED off continuously
Phase 1: LED on continuously
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
18 ______________________________________________________________________________________
Table 11. Master, O16 Intensity Register
REGISTER DATA
REGISTER
ADDRESS
CODE
(hex) D7 D6 D5 D4 D3 D2 D1 D0
MSB LSB
MSB LSB
MASTER AND GLOBAL INTENSITY
R/W
MASTER INTENSITY O16 INTENSITY
Write master and global intensity
0
Read back master and global intensity
1M3
M2
M1 M0 G3 G2 G1
G0
Master intensity duty cycle is 0/15 (off);
internal oscillator is disabled;
all outputs will be static with no PWM
—
0000————
Master intensity duty cycle is 1/15
—
0001————
Master intensity duty cycle is 2/15
—
0010————
Master intensity duty cycle is 3/15
—
0011————
—
—
————————
Master intensity duty cycle is 13/15
—
1101————
Master intensity duty cycle is 14/15
—
1110————
Master intensity duty cycle is 15/15 (full) —
1111————
O/16 intensity duty cycle is 1/16
—
———— 0 0 0 0
O/16 intensity duty cycle is 2/16
—
———— 0 0 0 1
O/16 intensity duty cycle is 3/16
—
———— 0 0 1 0
—
—
————————
O/16 intensity duty cycle is 14/16
—
———— 1 1 0 1
O/16 intensity duty cycle is 15/16
—
———— 1 1 1 0
O/16 intensity duty cycle is 16/16
(static output, no PWM)
—
0X0E
———— 1 1 1 1
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
______________________________________________________________________________________ 19
Table 12. Output Intensity Registers
REGISTER DATA
REGISTER
ADDRESS
CODE
(hex) D7 D6 D5 D4 D3 D2 D1 D0
MSB LSB
MSB LSB
OUTPUTS O1, O0 INTENSITY
R/W
OUTPUT O1 INTENSITY OUTPUT O0 INTENSITY
Write output O1, O0 intensity
0
Read back output O1, O0 intensity
1O1I3 O1I2 O1I1 O1I0 O0I3 O0I2 O0I1
O0I0
Output O1 intensity duty cycle is 1/16
—
0000————
Output O1 intensity duty cycle is 2/16
—
0001————
Output O1 intensity duty cycle is 3/16
—
0010————
—
—
————————
Output O1 intensity duty cycle is 14/16
—
1101————
Output O1 intensity duty cycle is 15/16
—
1110————
Output O1 intensity duty cycle is 16/16
(static logic level, no PWM)
—
1111————
Output O0 intensity duty cycle is 1/16
—
———— 0 0 0 0
Output O0 intensity duty cycle is 2/16
—
———— 0 0 0 1
Output O0 intensity duty cycle is 3/16
—
———— 0 0 1 0
—
—
————————
Output O0 intensity duty cycle is 14/16
—
———— 1 1 0 1
Output O0 intensity duty cycle is 15/16
—
———— 1 1 1 0
Output O0 intensity duty cycle is 16/16
(static logic level, no PWM)
—
0X10
———— 1 1 1 1
MSB LSB
MSB LSB
OUTPUTS O3, O2 INTENSITY OUTPUT O3 INTENSITY OUTPUT O2 INTENSITY
Write output O3, O2 intensity
0
Read back output O3, O2 intensity
1
0x11
O3I3 O3I2 O3I1 O3I0 O2I3 O2I2 O2I1
O2I0
MSB LSB
MSB LSB
OUTPUTS O5, O4 INTENSITY OUTPUT O5 INTENSITY OUTPUT O4 INTENSITY
Write output O5, O4 intensity
0
Read back output O5, O4 intensity
1
0x12
O5I3 O5I2 O5I1 O5I0 O4I3 O4I2 O4I1
O4I0
MSB LSB
MSB LSB
OUTPUTS O7, O6 INTENSITY OUTPUT O7 INTENSITY OUTPUT O6 INTENSITY
Write output O7, O6 intensity
0
Read back output O7, O6 intensity
1
0x13
O7I3 O7I2 O7I1 O7I0 O6I3 O6I2 O6I1
O6I0
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
20 ______________________________________________________________________________________
Table 12. Output Intensity Registers (continued)
REGISTER DATA
REGISTER
ADDRESS
CODE
(hex) D7 D6 D5 D4 D3 D2 D1 D0
MSB LSB
MSB LSB
OUTPUTS O9, O8 INTENSITY
R/W
OUTPUT O9 INTENSITY OUTPUT O8 INTENSITY
Write output O9, O8 intensity
0
Read back output O9, O8 intensity
1
0x14
O9I3 O9I2 O9I1 O9I0 O8I3 O8I2 O8I1
O8I0
MSB LSB
MSB LSB
OUTPUTS O11, O10 INTENSITY OUTPUT O11 INTENSITY OUTPUT O10 INTENSITY
Write output O11, O10 intensity
0
Read back output O11, O10 intensity
1
0x15
O11I3 O11I2 O11I1 O11I0 O10I3 O10I2 O10I1
O10I0
MSB LSB
MSB LSB
OUTPUTS O13, O12 INTENSITY OUTPUT O13 INTENSITY OUTPUT O12 INTENSITY
Write output O13, O12 intensity
0
Read back output O13, O12 intensity
1
0x16
O13I3 O13I2 O13I1 O13I0 O12I3 O12I2 O12I1
O12I0
MSB LSB
MSB LSB
OUTPUTS O15, O14 INTENSITY OUTPUT O15 INTENSITY OUTPUT O14 INTENSITY
Write output O15, O14 intensity
0
Read back output O15, O14 intensity
1
0x17
O15I3 O15I2 O15I1 O15I0 O14I3 O14I2 O14I1
O14I0
OUTPUT O16 INTENSITY See master, 016 register (Table 11).
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
______________________________________________________________________________________ 21
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
V+
SDA
SCL
BLINKO0
ADO
RST
TOP VIEW
O15
O14
O13
O12O4
O3
O2
O1
16
15
14
13
9
10
11
12
O11
O10
O9
O8GND
O7
O6
O5
QSOP
MAX6964AEG
O16
Pin Configurations (continued) Chip Information
TRANSISTOR COUNT: 25,991
PROCESS: BiCMOS
MAX6964 O8
O10
O0
O1
O2
O3
O4
O5
O6
O7
V+
3.3V
µC
SDA
SCL
SDA
I/O
I/O
AD0
5V 3.3V 6V
O11
O12
O13
O14
O15
SCL
O9
OUTPUT
OUTPUT
RELAY
RELAY
GND
7V
0.047µF
RST
BLINK
O16
RELAY
Typical Application Circuit
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
22 ______________________________________________________________________________________
QSOP.EPS
F
11
21-0055
PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 23
© 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
24L QFN THIN.EPS
PACKAGE OUTLINE,
21-0139
2
1
E
12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
PACKAGE OUTLINE,
21-0139
2
2
E
12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
