9-Output LED Driver with Intensity Control

and Hot-Insertion Protection

________________________________________________________________ Maxim Integrated Products

1

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

General Description

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.

addresses.

Applications

LCD Backlights

LED Status Indication

Keypad Backlights

RGB LED Drivers

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

MAX6965

O0

O1

O2

O3

O4

O5

V+

3.3V

µC

SDA

SCL

SDA

I/O

I/O

AD0

6V

O6

O7

O8

SCL

RELAY

RELAY

GND

7V

0.047

µF

RST

BLINK

RELAY

Typical Application Circuit

19-3058; Rev 3; 3/05

Ordering Information

PART

TEMP

RANGE

PIN-

PACKAGE

TOP

MARK

PKG

CODE

MAX6965ATE

-40

°C to

+125

°C

16 Thin QFN

3mm x 3mm

x 0.8mm

AAW

T1633-4

MAX6965AEE

-40

°C to

16 QSOP

——

Pin Configurations appear at end of data sheet.

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