MAX6965 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – 9-Output LED Driver with Intensity Control and Hot-Insertion Protection

19-3058; Rev 3; 3/05
9-Output LED Driver with Intensity Control
and Hot-Insertion Protection
General Description
The MAX6965 I²C™-compatible serial interfaced periph-
eral provides microprocessors with nine additional out-
put ports. Each output is an open-drain current-sinking
output rated to 50mA at 7V. All outputs are capable of
driving 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
then 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 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).
The MAX6965 supports hot insertion. The SDA, SCL,
RST, BLINK, and the slave address input AD0 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 MAX6965 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
Pin Configurations appear at end of data sheet.
Purchase of I²C components of Maxim Integrated Products, Inc.,
or one of its sublicensed Associated Companies, conveys a
license under the Philips I²C Patent Rights to use these compo-
nents in an I²C system, provided that the system conforms to the
I²C Standard Specification as defined by Philips.
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 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))
♦ Tiny 3mm x 3mm, Thin QFN Package
♦ -40°C to +125°C Temperature Range
Ordering Information
PART
TEMP PIN-
TOP PKG
RANGE PACKAGE MARK CODE
MAX6965ATE
-40°C to
+125°C
MAX6965AEE -40°C to
16 Thin QFN
3mm x 3mm
x 0.8mm
16 QSOP
AAW
—
T1633-4
—
Typical Application Circuit
3.3V
7V
0.047µF
V+
µC
MAX6965
SDA
SDA
O0
SCL
SCL
O1
O2
I/O
BLINK
O3
I/O
RST
O4
O5
AD0
O6
O7
O8
GND
6V RELAY
RELAY
RELAY
________________________________________________________________ Maxim Integrated Products 1
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