MAX6964_05 Datasheet, PDF (1/23 Pages) Maxim Integrated Products – 17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection

19-3179; Rev 3; 3/05
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17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
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
LCD Backlights
LED Status Indication
Keypad Backlights
RGB LED Drivers
Typical Application Circuit at end of data sheet.
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
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG CODE
24 Thin QFN
MAX6964ATG -40°C to +125°C 4mm x 4mm
x 0.8mm
MAX6964AEG -40°C to +125°C 24 QSOP
T2444-4
—
Pin Configurations
TOP VIEW
18 17 16 15 14 13
SCL 19
12 O10
SDA 20
11 O9
V+ 21
O16 22
MAX6964
10 O8
9 GND
RST 23
8 O7
AD0 24
7 O6
12345 6
QFN
Pin Configurations continued at end of data sheet.
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