19-3179; Rev 3; 3/05
KIT
ATION
EVALU
LE
B
A
IL
A
AV
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
Features
The MAX6964 I2C-compatible serial interfaced peripheral 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 driving LEDs, or providing logic outputs with external
resistive pullup up to 7V.
♦ 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
LCD Backlights
Keypad Backlights
LED Status Indication
RGB LED Drivers
MAX6964ATG
T2444-4
MAX6964AEG -40°C to +125°C 24 QSOP
—
TOP VIEW
O11
Pin Configurations
18
17
16
15
14
13
SCL 19
12 O10
SDA 20
11 O9
V+ 21
10 O8
MAX6964
O16 22
Typical Application Circuit at end of data sheet.
PKG CODE
24 Thin QFN
-40°C to +125°C 4mm x 4mm
x 0.8mm
O12
Applications
PINPACKAGE
TEMP RANGE
O13
The MAX6964 is controlled through a 2-wire I 2 C
serial interface, and can be configured to one of four
I2C addresses.
PART
O14
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.
Ordering Information
O15
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 control. 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).
BLINK
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.
9 GND
8 O7
RST 23
7 O6
1
2
3
4
5
6
O0
O1
O2
O3
O4
O5
AD0 24
QFN
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX6964
General Description
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
ABSOLUTE MAXIMUM RATINGS
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
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
(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
Operating Supply Voltage
Output Load External Supply
Voltage
Standby Current
(Interface Idle, PWM Disabled)
Supply Current
(Interface Idle, PWM Enabled)
Supply Current
(Interface Running, PWM
Disabled)
Supply Current
(Interface Running, PWM
Enabled)
SYMBOL
MAX
UNITS
V+
2.0
3.6
V
VEXT
0
7
V
I+
I+
I+
I+
Input High Voltage
SDA, SCL, AD0, BLINK, RST
VIH
Input Low Voltage
SDA, SCL, AD0, BLINK, RST
VIL
Input Leakage Current
SDA, SCL, AD0, BLINK, RST
IIH, IIL
Input Capacitance
SDA, SCL, AD0, BLINK, RST
2
CONDITIONS
SCL and SDA at V+; other
digital inputs at V+ or GND;
PWM intensity control disabled
TA = +25°C
SCL and SDA at V+; other
digital inputs at V+ or GND;
PWM intensity control disabled
TA = +25°C
fSCL = 400kHz; other digital
inputs at V+ or GND; PWM
intensity control enabled
TA = +25°C
fSCL = 400kHz; other digital
inputs at V+ or GND; PWM
intensity control enabled
MIN
TYP
1.2
2.3
TA = -40°C to +85°C
2.6
TA = TMIN to TMAX
3.3
8.5
15.1
TA = -40°C to +85°C
16.5
TA = TMIN to TMAX
17.2
50
TA = -40°C to +85°C
99.2
102.4
57
µA
110.2
TA = -40°C to +85°C
117.4
TA = TMIN to TMAX
122.1
0.7 x
V+
0 ≤ input voltage ≤ 5.5V
µA
95.3
TA = TMIN to TMAX
TA = +25°C
µA
µA
V
-0.2
8
_______________________________________________________________________________________
0.3 x
V+
V
+0.2
µA
pF
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
(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
TA = +25°C
V+ = 2V, ISINK = 20mA
VOL
V+ = 2.5V, ISINK = 20mA
Output Low-Voltage SDA
PWM Clock Frequency
VOLSDA
0.15
0.26
0.3
TA = TMIN to TMAX
0.32
0.13
0.26
TA = TMIN to TMAX
0.28
0.12
0.24
TA = TMIN to TMAX
0.26
ISINK = 6mA
V
V
0.23
TA = -40°C to +85°C
0.4
fPWM
UNITS
0.23
TA = -40°C to +85°C
TA = +25°C
V+ = 3.3V, ISINK = 20mA
MAX
TA = -40°C to +85°C
TA = +25°C
Output Low Voltage
O0–O16
TYP
32
V
V
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
400
kHz
Serial Clock Frequency
fSCL
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
Data Hold Time
tHD, DAT
0.6
µs
Data Setup Time
tSU, DAT
180
ns
SCL Clock Low Period
tLOW
1.3
µs
SCL Clock High Period
tHIGH
0.7
µs
(Note 2)
0.9
µs
Rise Time of Both SDA and SCL Signals, Receiving
tR
(Notes 3, 4)
20 +
0.1Cb
300
ns
Fall Time of Both SDA and SCL Signals, Receiving
tF
(Notes 3, 4)
20 +
0.1Cb
300
ns
tF.TX
(Notes 3, 5)
20 +
0.1Cb
250
ns
Fall Time of SDA Transmitting
Pulse Width of Spike Suppressed
tSP
(Note 6)
50
ns
_______________________________________________________________________________________
3
MAX6964
ELECTRICAL CHARACTERISTICS (continued)
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
Capacitive Load for Each Bus Line
Cb
RST Pulse Width
tW
Output Data Valid
tDV
CONDITIONS
MIN
TYP
(Note 3)
MAX
UNITS
400
pF
1
ns
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. tR and tF measured between 0.3 x VDD and 0.7 x VDD.
Note 5: ISINK ≤ 6mA. Cb = total capacitance of one bus line in pF. tR and tF measured 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.
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
7
6
V+ = 3.6V
V+ = 2.7V
V+ = 2V
-40 -25 -10 5 20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
PORT OUTPUT LOW VOLTAGE WITH 50mA
LOAD CURRENT vs. TEMPERATURE
PORT OUTPUT LOW VOLTAGE WITH 20mA
LOAD CURRENT vs. TEMPERATURE
PWM CLOCK FREQUENCY
vs. TEMPERATURE
0.5
V+ = 2.7V
V+ = 2V
0.3
V+ = 3.6V
0.1
0.6
PORT OUTPUT LOW VOLTAGE VOL (V)
MAX6964 toc04
0.6
ALL OUTPUTS LOADED
0.5
0.4
0.3
V+ = 2V
0.2
0.1
V+ = 2.7V
V+ = 3.6V
0
0
4
V+ = 2V
20
0
0
0.2
V+ = 2.7V
30
10
1
0.4
40
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
1.050
1.025
MAX6964 toc06
2
V+ = 3.6V
PWM CLOCK FREQUENCY (kHz)
3
V+ = 2V
PWM ENABLED
V+ = 2.7V
V+ = 3.6V
PWM ENABLED
PWM
V+ = 2V
V+ = 2.7V
PWM DISABLED PWM DISABLED DISABLED
50
MAX6964 toc05
4
60
SUPPLY CURRENT (µA)
8
5
70
MAX6964 toc02
V+ = 3.6V
PWM ENABLED
SUPPLY CURRENT (µA)
STANDBY CURRENT (µA)
9
MAX6964 toc01
10
SUPPLY CURRENT vs. TEMPERATURE
(PWM ENABLED; fSCL = 400kHz)
MAX6964 toc03
SUPPLY CURRENT vs. TEMPERATURE
(PWM DISABLED; fSCL = 400kHz)
STANDBY CURRENT vs. TEMPERATURE
PORT OUTPUT LOW VOLTAGE VOL (V)
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
V+ = 3.6V
1.000
0.975
V+ = 2.7V
V+ = 2V
0.950
0.925
0.900
NORMALIZED TO V+ = 3.3V, TA = 25°C
-40 -25 -10 5 20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
SCOPE SHOT OF OUTPUT PORTS
SINK CURRENT vs. VOL
MAX6964 toc08
MAX6964 toc07
0.35
MASTER INTENSITY SET TO 1/15
MASTER INTENSITY SET TO 14/15
ONLY ONE OUTPUT LOADED
OUTPUT 1
2V/div
OUTPUT 1,
2V/div
0.30
VOL (V)
OUTPUT 2,
2V/div
OUTPUT 2
2V/div
OUTPUT 2 INDIVIDUAL INTENSITY
SET TO 15/16
OUTPUT 2 INDIVIDUAL INTENSITY
SET TO 14/15
V+ = 2V
0.25
OUTPUT 1 INDIVIDUAL INTENSITY
SET TO 1/16
OUTPUT 1 INDIVIDUAL INTENSITY
SET TO 1/16
MAX6964 toc09
SCOPE SHOT OF OUTPUT PORTS
0.20
V+ = 2.7V
V+ = 3.3V
0.15
V+ = 3.6V
0.10
0.05
0
2ms/div
2ms/div
0
10
20
30
40
50
SINK CURRENT (mA)
Pin Description
PIN
QSOP
QFN
1, 4–11, 13–20
1–8, 10–17, 22
NAME
O0-O16
FUNCTION
Output Ports. Open-drain outputs rated at 7V, 50mA.
2
23
RST
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
22
19
SCL
I2C-Compatible Serial Clock Input
23
20
SDA
I2C-Compatible Serial Data I/O
24
21
V+
—
Pad
Exposed Pad
Input Port. Configurable as blink control or general-purpose input.
Positive Supply Voltage. Bypass V+ to GND with a 0.047µF ceramic capacitor.
Exposed pad on package underside. Connect to GND.
_______________________________________________________________________________________
5
MAX6964
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
Functional Overview
The MAX6964 is a general-purpose output (GPO)
peripheral that provides 17 output ports, O0–O16, controlled 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 supply 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 levels 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 registers, 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
DATA FROM
SHIFT REGISTER
OUTPUT
PORT
REGISTER
D
Q
OUTPUT PORT
REGISTER DATA
I/O PIN
FF
WRITE PULSE
CK
Q2
Q
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 control. PWM intensity control can be enabled on an output-by-output basis, allowing the MAX6964 to provide
any mix of PWM LED drives and glitch-free logic outputs (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 outputs. The master control sets the maximum pulse width
from 1/15 to 15/15 of the PWM time period. The individual settings comprise a 4-bit number, further reducing
the duty cycle to be from 1/16 to 15/16 of the time window 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 control software and provide 240 steps of intensity control
(Tables 8 and 11).
GND
Figure 1. Simplified Schematic of I/O Ports
SDA
tSU,STA
tSU,DAT
tLOW
tBUF
tHD,STA
tSU,STO
tHD,DAT
tHIGH
SCL
tHD,STA
tR
tF
START CONDITION
REPEATED START CONDITION
STOP
CONDITION
Figure 2. 2-Wire Serial Interface Timing Details
6
_______________________________________________________________________________________
START
CONDITION
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
Serial Interface
Serial Addressing
The MAX6964 operates as a slave that sends and
receives data through an I2C-compatible 2-wire interface. The interface uses a serial data line (SDA) and a
serial clock line (SCL) to achieve bidirectional communication between master(s) and slave(s). A master (typically a microcontroller) initiates all data transfers to and
from the MAX6964 and generates the SCL clock that
synchronizes the data transfer (Figure 2).
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.
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 2wire 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/W bit, a register address
byte, 1 or more data bytes, and finally a STOP condition (Figure 3).
SDA
SCL
S
P
START
CONDITION
STOP
CONDITION
Figure 3. Start and Stop Conditions
Start and Stop Conditions
Both SCL and SDA remain high when the interface is
not busy. A master signals the beginning of a transmission 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).
SDA
SCL
DATA LINE STABLE; CHANGE OF DATA
DATA VALID
ALLOWED
Figure 4. Bit Transfer
CLOCK PULSE
FOR ACKNOWLEDGE
START
CONDITION
SCL
Bit Transfer
One data bit is transferred during each clock pulse.
The data on SDA must remain stable while SCL is high
(Figure 4).
1
2
8
Acknowledge
The acknowledge bit is a clocked 9th bit that the recipient 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
9
SDA BY
TRANSMITTER
SDA BY
RECEIVER
S
Figure 5. Acknowledge
SDA
A6
1
0
0
A2
0
0
R/W
ACK
LSB
MSB
SCL
Figure 6. Slave Address
_______________________________________________________________________________________
7
MAX6964
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).
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
Table 1. MAX6964 Address Map
PIN AD0
DEVICE ADDRESS
A6
A5
A4
A3
A2
A1
A0
0
SCL
1
1
0
0
0
0
SDA
1
1
0
0
1
0
0
GND
0
1
0
0
0
0
0
V+
0
1
0
0
1
0
0
Table 2. Register Address Map
REGISTER
ADDRESS CODE
(hex)
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
during the high period of the clock pulse. When the
master is transmitting to the MAX6964, the device generates 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/W bit. The R/W bit 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 connected to GND, V+, SDA, or SCL. The MAX6964 has
8
AUTOINCREMENT
ADDRESS
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/W bit 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
S
SLAVE ADDRESS
0
D15
A
D14
D13
D12
D11
D10
D9
D8
COMMAND BYTE
A
R/W
MAX6964
COMMAND BYTE IS STORED ON RECEIPT OF
STOP CONDITION
ACKNOWLEDGE FROM MAX6964
P
ACKNOWLEDGE FROM MAX6964
Figure 7. Command Byte Received
ACKNOWLEDGE FROM MAX6964
HOW COMMAND BYTE AND DATA BYTE MAP INTO
MAX6964's REGISTERS
D15 D14 D13 D12 D11 D10
D9
ACKNOWLEDGE FROM MAX6964
D8
D7
D6
D5
D4
D3
D2
D1
D0
ACKNOWLEDGE FROM MAX6964
SLAVE ADDRESS
S
0
A
COMMAND BYTE
A
DATA BYTE
A
P
1
BYTE
AUTOINCREMENT MEMORY ADDRESS
R/W
Figure 8. Command and Single Data Byte Received
ACKNOWLEDGE FROM MAX6964
HOW COMMAND BYTE AND DATA BYTE MAP INTO
MAX6964's REGISTERS
D15 D14 D13 D12 D11 D10
D9
ACKNOWLEDGE FROM MAX6964
D8
D7
D6
D5
D4
D3
D2
D1
D0
ACKNOWLEDGE FROM MAX6964
S
SLAVE ADDRESS
0
A
COMMAND BYTE
A
DATA BYTE
A
P
N
BYTE
AUTOINCREMENT MEMORY ADDRESS
R/W
Figure 9. n Data Bytes Received
WRITE TO OUTPUT PORTS REGISTERS (BLINK PHASE 0 REGISTERS/BLINK PHASE 1 REGISTERS)
SCL
1
2
3
4
5
6
7
8
9
SDA S A6 A5 A4 A3 A2 A1 A0
0
A
SLAVE ADDRESS
START CONDITION
COMMAND BYTE
0
0
0
0
0
0
0
1
R/W ACKNOWLEDGE FROM SLAVE
A MSB
DATA1
ACKNOWLEDGE FROM SLAVE
LSB
A MSB
LSB A
DATA2
ACKNOWLEDGE FROM SLAVE
O7–O0
P
STOP
CONDITION
DATA1 VALID
tDV
O15– O8
DATA2 VALID
tDV
Figure 10. Write Timing Diagram
If multiple data bytes are transmitted before a STOP condition 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-
_______________________________________________________________________________________
9
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
ing the MAX6964’s command byte by performing a
write (Figure 7). The master can now read n consecutive bytes from the MAX6964 with the first data byte
being read from the register addressed by the initialized 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 circulates 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 registers 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 output, and read back the BLINK input logic level (Table 4).
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 programming different display patterns in the two sets of
output port registers, and using the software or hardware 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 programmed into the blink phase 0 registers. This technique 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 outputs 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 readonly 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.
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
10
______________________________________________________________________________________
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
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
1
1
1
1
1
1
1
1
Blink phase 0 outputs O15–O8
High-impedance outputs
0x03
1
1
1
1
1
1
1
1
User RAM0
0xFF
0x06
1
1
1
1
1
1
1
1
User RAM1
0xFF
0x07
1
1
1
1
1
1
1
1
Blink phase 1 outputs O7–O0
High-impedance outputs
0x0A
1
1
1
1
1
1
1
1
Blink phase 1 outputs O15–O8
High-impedance outputs
0x0B
1
1
1
1
1
1
1
1
Master and global/O16
intensity
PWM oscillator is disabled;
O16 is static logic output
0x0E
0
0
0
0
1
1
1
1
Configuration
O16 is high-impedance output;
blink is disabled;
global intensity is enabled
0x0F
0
0
1
1
0
1
0
0
Outputs intensity O1, O0
O1, O0 are static logic outputs
0x10
1
1
1
1
1
1
1
1
Outputs intensity O3, O2
O3, O2 are static logic outputs
0x11
1
1
1
1
1
1
1
1
Outputs intensity O5, O4
O5, O4 are static logic outputs
0x12
1
1
1
1
1
1
1
1
Outputs intensity O7, O6
O7, O6 are static logic outputs
0x13
1
1
1
1
1
1
1
1
Outputs intensity O9, O8
O9, O8 are static logic outputs
0x14
1
1
1
1
1
1
1
1
Outputs intensity O11, O10
O11, O10 are static logic outputs
0x15
1
1
1
1
1
1
1
1
Outputs intensity O13, O12
O13, O12 are static logic outputs
0x16
1
1
1
1
1
1
1
1
Outputs intensity O15, O14
O15, O14 are static logic outputs
0x17
1
1
1
1
1
1
1
1
REGISTER DATA
Table 4. Configuration Register
0
Read back device configuration
1
0
Disable blink
—
Enable blink
—
Flip blink register (see text)
0x0F
X
D3
D2
D1
D0
BLINK
ENABLE
Write device configuration
D4
BLINK FLIP
0
CONFIGURATION
D5
GLOBAL
INTENSITY
R/W
D6
G
B
E
X
X
X
0
X
X
X
1
X
X
X
0
1
X
X
X
1
1
OUTPUT
O16
D7
0
REGISTER DATA
BLINK
STATUS
ADDRESS
CODE
(hex)
REGISTER
BLINK
O1
O0
X
X
X
X
X
X
X
X
—
X
X
X
—
X
X
X
X
0
X = Don’t care.
______________________________________________________________________________________
11
MAX6964
Table 3. Power-Up Configuration
Table 4. Configuration Register (continued)
REGISTER DATA
D7
D6
D2
D1
D0
G
B
E
X
0
X
X
X
X
1
X
X
X
0
0
X
X
0
X
X
1
0
X
X
0
X
X
X
0
0
X
X
1
—
X
X
X
1
0
X
X
1
BLINK
STATUS
CONFIGURATION
Write device configuration
0
X
Read back device configuration
1
0
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
—
Enable global intensity control—intensity
for all ports configured as outputs is set
by D3–D0 of register 0x0E
—
O16 output is low (blink is disabled)
OUTPUT
O16
BLINK
ENABLE
D3
BLINK FLIP
D4
GLOBAL
INTENSITY
R/W
D5
0
ADDRESS
CODE
(hex)
REGISTER
0
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
BLINK
O1
O0
X
X
X
X
X
X
X
—
X
X
O16 output is high impedance (blink is
disabled)
—
X
O16 output is low during blink phase 0
—
O16 output is high impedance during
blink phase 0
X
0
0x0F
O16 output is low during blink phase 1
—
X
X
0
X
0
X
X
1
O16 output is high impedance during
blink phase 1
—
X
X
1
X
0
X
X
1
Read back BLINK input pin status;
input is low
1
X
0
X
X
X
X
X
X
Read back BLINK input pin status;
input is high
1
X
1
X
X
X
X
X
X
X = Don’t care.
Table 5. Blink Controls
BLINK ENABLE
FLAG
E
BLINK FLIP
FLAG
B
BLINK INPUT
PIN
BLINK FLIP FLAG
EXOR
BLINK INPUT PIN
BLINK
FUNCTION
0
X
X
X
Disabled
0
0
0
0
1
1
1
0
1
1
1
0
1
OUTPUT REGISTERS
USED
Blink phase 0
Blink phase 0
Enabled
Blink phase 1
Blink phase 1
Blink phase 0
X = Don’t care.
12
______________________________________________________________________________________
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
REGISTER
R/W
Write outputs O7–O0 phase 0
0
Read back outputs O7–O0 phase 0
1
Write outputs O15–O8 phase 0
0
Read back outputs O15–O8 phase 0
1
ADDRESS
CODE
(hex)
REGISTER DATA
D7
D6
D5
D4
D3
D2
D1
D0
0x02
OP7
OP6
OP5
OP4
OP3
OP2
OP1
OP0
0x03
OP15
OP14
OP13
OP12
OP11
OP10
OP9
OP8
Table 7. Blink Phase 1 Registers
REGISTER
R/W
Write outputs O7–O0 phase 1
0
Read back outputs O7–O0 phase 1
1
Write outputs O15–O8 phase 1
0
Read back outputs O15–O8 phase 1
1
ADDRESS
CODE
(hex)
REGISTER DATA
D7
D6
D5
D4
D3
D2
D1
D0
0x0A
OP7
OP6
OP5
OP4
OP3
OP2
OP1
OP0
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.
______________________________________________________________________________________
13
MAX6964
Table 6. Blink Phase 0 Registers
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
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 individual or global setting can be set to is 16/16. This setting
forces the output to ignore the master control, and follow the logic level set by the appropriate blink phase
register bit. The output becomes a glitch-free static output with no PWM.
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 combination of PWM outputs and glitch-free logic outputs.
Each PWM output has an individual 4-bit intensity control (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.
Using PWM Intensity Controls with Blink Disabled
When blink is disabled (Table 5), the blink phase 0 registers specify each output’s logic level during the PWM ontime (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.
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 individual output settings to be enabled from 1 to 15 timeslots
per PWM period (Figures 13, 14, and 15) (Table 11).
Using PWM Intensity Controls with Blink Enabled
When blink is enabled (Table 5), the blink phase 0 registers 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.
Each output’s individual 4-bit intensity control only
operates during the number of timeslots gated by the
BLINK ENABLE FLAG E
Global/O16 Intensity Control
BLINK FLIP FLAG B
The 4 bits used for output O16’s PWM individual intensity 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
BLINK PHASE
REGISTERS
BLINK INPUT
Figure 11. BLINK Logic
ONE PWM PERIOD IS 240 CYCLES OF THE 32kHz PWM
OSCILLATOR; A PWM PERIOD CONTAINS 15 MASTER
INTENSITY TIMESLOTS
14
15
15 16 1
1
2
2
3
3
4
5
4
6
7
5
8
6
7
8
9 10 11 12 13 14 15 16
9
1
10
11
12
13
14
15
1
2
EACH MASTER INTENSITY
TIMESLOT CONTAINS 16
PWM CYCLES
Figure 12. PWM Timing
14
______________________________________________________________________________________
2
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
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-impedance 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
220kΩ is 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.
Applications Information
Hot Insertion
The RST input, BLINK input, and serial interface SDA,
SCL, AD0 remain high impedance with up to 6V asserted on them when the MAX6964 is powered down (V+ =
0V). Ouptut ports O0–O16 remain high impedance with
14
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
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 following formula:
RLED = (VSUPPLY - VLED - VOL) / ILED
2
.
Figure 13. Master Set to 1/15
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).
.
14 15 1
2
3
4
5
6
7
8
9 10 11 12 13 14
15 1
2
.
Figure 14. Master Set to 14/15
.
14
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
.
Figure 15. Master Set to 15/15
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
7
8
9 10 11 12 13 14 15 16
Figure 17. Individual (or Global) Set to 15/16
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
Figure 18. Individual (or Global) Set to 16/16
______________________________________________________________________________________
15
MAX6964
enabled with the global intensity flag G in the configuration 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, 240step intensity control applying to all outputs.
It is not possible to apply global PWM control to a subset 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).
For example, to operate a 2.2V red LED at 14mA from a
5V supply, RLED = (5 - 2.2 - 0.25) / 0.014 = 182Ω.
2V TO 3.6V
5V
Driving Load Currents Higher than 50mA
0.047µF
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 inductive loads, such as relays, by connecting a reversebiased diode across the inductive load (Figure 19). The
peak current through the diode is the inductive load’s
operating current.
V+
µC
O0
O1
SDA
SDA
O2 MMTBT4148
SCL
SCL
O3
I/O
BLINK
O4
I/O
RST
O5
O6
MAX6964
O7
O8
O9
AD0
O10
O11
O12
O13
O14
GND
O15
Figure 19. Diode-Protected Switching Inductive Load
Table 9. PWM Intensity Settings (Blink Disabled)
16
PWM DUTY CYCLE
OUTPUT BLINK PHASE 0
REGISTER BIT = 0
LOW TIME
HIGH TIME
0x0
1/16
15/16
0x1
2/16
0x2
0x3
LED BEHAVIOR WHEN
OUTPUT BLINK PHASE 0
REGISTER BIT = 0
(LED IS ON WHEN
OUTPUT IS LOW)
PWM DUTY CYCLE
OUTPUT BLINK PHASE 0
REGISTER = 1
LOW TIME
HIGH TIME
15/16
1/16
14/16
14/16
2/16
3/16
13/16
13/16
3/16
4/16
12/16
12/16
4/16
0x4
5/16
11/16
11/16
5/16
0x5
6/16
10/16
0x6
7/16
9/16
0x7
8/16
8/16
0x8
9/16
7/16
0x9
10/16
6/16
0xA
11/16
5/16
Lowest PWM intensity
10/16
6/16
9/16
7/16
8/16
8/16
7/16
9/16
6/16
10/16
5/16
11/16
4/16
12/16
LED BEHAVIOR WHEN
OUTPUT BLINK PHASE 0
REGISTER BIT = 1
(LED IS ON WHEN
OUTPUT IS LOW)
Highest PWM intensity
Increasing PWM intensity
OUTPUT
(OR
GLOBAL)
INTENSITY
SETTING
Increasing PWM intensity
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
0xB
12/16
4/16
0xC
13/16
3/16
3/16
13/16
0xD
14/16
2/16
2/16
14/16
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
______________________________________________________________________________________
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
OUTPUT
(OR
GLOBAL)
INTENSITY
SETTING
PWM DUTY CYCLE
OUTPUT BLINK
PHASE X
REGISTER BIT = 0
PWM DUTY CYCLE
OUTPUT BLINK
PHASE X
REGISTER = 1
LOW
TIME
HIGH
TIME
LOW
TIME
HIGH
TIME
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
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
2/16
14/16
0xE
15/16
1/16
1/16
15/16
0xF
Static low
Static low
Static high Static high
impedance impedance
MAX6964
Table 10. PWM Intensity Settings (Blink Enabled)
EXAMPLES OF LED BLINK BEHAVIOR
(LED IS ON WHEN OUTPUT IS LOW)
BLINK PHASE 0
REGISTER BIT = 0
BLINK PHASE 1
REGISTER BIT = 1
BLINK PHASE 0
REGISTER BIT = 1
BLINK PHASE 1
REGISTER BIT = 0
Phase 0: LED on at low intensity
Phase 1: LED on at high intensity
Phase 0: LED on at high intensity
Phase 1: LED on at low intensity
Output is half intensity during both blink phases
Phase 0: LED on at high intensity
Phase 1: LED on at low intensity
Phase 0: LED on at low intensity
Phase 1: LED on at high intensity
Phase 0: LED on continuously
Phase 1: LED off continuously
Phase 0: LED off continuously
Phase 1: LED on continuously
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.
______________________________________________________________________________________
17
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
Table 11. Master, O16 Intensity Register
REGISTER
ADDRESS
CODE
(hex)
R/W
REGISTER DATA
D7
D6
D5
MSB
MASTER AND GLOBAL INTENSITY
D4
D3
MASTER INTENSITY
Write master and global intensity
0
Read back master and global intensity
1
Master intensity duty cycle is 0/15 (off);
internal oscillator is disabled;
all outputs will be static with no PWM
D2
D1
LSB MSB
D0
LSB
O16 INTENSITY
M3
M2
M1
M0
G3
G2
G1
G0
—
0
0
0
0
—
—
—
—
Master intensity duty cycle is 1/15
—
0
0
0
1
—
—
—
—
Master intensity duty cycle is 2/15
—
0
0
1
0
—
—
—
—
Master intensity duty cycle is 3/15
—
0
0
1
1
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Master intensity duty cycle is 13/15
—
1
1
0
1
—
—
—
—
Master intensity duty cycle is 14/15
—
1
1
1
0
—
—
—
—
Master intensity duty cycle is 15/15 (full)
—
1
1
1
1
—
—
—
—
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)
—
—
—
—
—
1
1
1
1
18
0X0E
______________________________________________________________________________________
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
REGISTER
ADDRESS
CODE
(hex)
R/W
REGISTER DATA
D7
D6
D5
MSB
OUTPUTS O1, O0 INTENSITY
D4
D3
D2
D1
D0
LSB MSB
OUTPUT O1 INTENSITY
Write output O1, O0 intensity
0
Read back output O1, O0 intensity
1
Output O1 intensity duty cycle is 1/16
Output O1 intensity duty cycle is 2/16
Output O1 intensity duty cycle is 3/16
—
0
0
—
—
—
—
Output O1 intensity duty cycle is 14/16
—
1
1
Output O1 intensity duty cycle is 15/16
—
1
LSB
OUTPUT O0 INTENSITY
O1I3
O1I2
O1I1
O1I0
O0I3
O0I2
O0I1
O0I0
—
0
0
0
0
—
—
—
—
—
0
0
0
1
—
—
—
—
1
0
—
—
—
—
—
—
—
—
—
—
0
1
—
—
—
—
1
1
0
—
—
—
—
1
1
1
1
—
—
—
—
0X10
Output O1 intensity duty cycle is 16/16
(static logic level, no PWM)
—
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)
—
—
—
—
—
1
1
1
1
MSB
OUTPUTS O3, O2 INTENSITY
Write output O3, O2 intensity
0
Read back output O3, O2 intensity
1
0x11
LSB MSB
OUTPUT O3 INTENSITY
O3I3
O3I2
O3I1
MSB
OUTPUTS O5, O4 INTENSITY
Write output O5, O4 intensity
0
Read back output O5, O4 intensity
1
0x12
O5I2
O5I1
MSB
Write output O7, O6 intensity
0
Read back output O7, O6 intensity
1
0x13
O5I0
O2I2
O2I1
O2I0
LSB
OUTPUT O4 INTENSITY
O4I3
O4I2
O4I1
O4I0
LSB MSB
OUTPUT O7 INTENSITY
O7I3
O2I3
LSB MSB
OUTPUT O5 INTENSITY
O5I3
OUTPUTS O7, O6 INTENSITY
O3I0
LSB
OUTPUT O2 INTENSITY
O7I2
O7I1
O7I0
LSB
OUTPUT O6 INTENSITY
O6I3
O6I2
O6I1
O6I0
______________________________________________________________________________________
19
MAX6964
Table 12. Output Intensity Registers
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
Table 12. Output Intensity Registers (continued)
REGISTER
ADDRESS
CODE
(hex)
R/W
Write output O9, O8 intensity
0
Read back output O9, O8 intensity
1
0x14
D6
D5
0
Read back output O11, O10 intensity
1
0x15
O9I2
O9I1
Write output O13, O12 intensity
0
Read back output O13, O12 intensity
1
0x16
O11I2
O11I1
Write output O15, O14 intensity
0
Read back output O15, O14 intensity
1
0x17
O13I2
O13I1
O13I0
O15I2
O15I1
O15I0
D0
LSB
OUTPUT O8 INTENSITY
O8I3
O8I2
O8I1
O8I0
LSB
OUTPUT O10 INTENSITY
O10I3
O10I2
O10I1
O10I0
LSB
OUTPUT O12 INTENSITY
O12I3
O12I2
O12I1
LSB MSB
OUTPUT O15 INTENSITY
O15I3
D1
LSB MSB
MSB
OUTPUTS O15, O14 INTENSITY
O11I0
OUTPUT O13 INTENSITY
O13I3
D2
LSB MSB
MSB
OUTPUTS O13, O12 INTENSITY
O9I0
OUTPUT O11 INTENSITY
O11I3
D3
LSB MSB
MSB
Write output O11, O10 intensity
D4
OUTPUT O9 INTENSITY
O9I3
OUTPUTS O11, O10 INTENSITY
20
D7
MSB
OUTPUTS O9, O8 INTENSITY
OUTPUT O16 INTENSITY
REGISTER DATA
O12I0
LSB
OUTPUT O14 INTENSITY
O14I3
O14I2
See master, 016 register (Table 11).
______________________________________________________________________________________
O14I1
O14I0
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
7V
3.3V
0.047µF
O0
V+
µC
O1
SDA
SDA
O2
SCL
SCL
O3
I/O
BLINK
I/O
RST
O4
O5
O6
MAX6964
O7
O8
O9
AD0
O10
O11
RELAY
O12
O13
O14
GND
5V
O15
O16
3.3V
6V
RELAY
RELAY
OUTPUT
OUTPUT
Pin Configurations (continued)
TOP VIEW
O16 1
24 V+
RST 2
23 SDA
ADO 3
22 SCL
O0 4
O1 5
Chip Information
TRANSISTOR COUNT: 25,991
PROCESS: BiCMOS
21 BLINK
MAX6964AEG
20 O15
O2 6
19 O14
O3 7
18 O13
O4 8
17 O12
O5 9
16 O11
O6 10
15 O10
O7 11
14 O9
GND 12
13 O8
QSOP
______________________________________________________________________________________
21
MAX6964
Typical Application Circuit
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.)
QSOP.EPS
MAX6964
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH
21-0055
22
______________________________________________________________________________________
F
1
1
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
24L QFN THIN.EPS
PACKAGE OUTLINE,
12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
21-0139
E
1
2
PACKAGE OUTLINE,
12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
21-0139
E
2
2
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.
MAX6964
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.)
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