Rainbow Electronics MAX6965 User Manual

General description, Applications features, Pin configurations

General Description

The MAX6965 I

C™-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 is controlled through a 2-wire I

C serial

interface, and can be configured to one of four I

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

♦ 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

9-Output LED Driver with Intensity Control

________________________________________________________________ Maxim Integrated Products

RST

BLINK

V+

SDA

SCL

GND

AD0

TOP VIEW

MAX6965ATE

QFN

Pin Configurations

MAX6965

V+

3.3V

µC

SDA

SCL

SDA

I/O

AD0

SCL

RELAY

GND

0.047

µF

RST

BLINK

RELAY

Typical Application Circuit

19-3058; Rev 0; 10/03

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.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

TOP

MARK

MAX6965ATE -40

°C to +125°C

16 Thin QFN
3mm x 3mm x 0.8mm

AAW

MAX6965AEE -40

°C to +125°C 16 QSOP

—

Pin Configurations continued at end of data sheet.

LCD Backlights

LED Status Indication

Keypad Backlights

RGB LED Drivers

Purchase of I

C components of Maxim Integrated Products, Inc.,

or one of its sublicensed Associated Companies, conveys a
license under the Philips I

C Patent Rights to use these compo-

nents in an I

C system, provided that the system conforms to the

C Standard Specification as defined by Philips.