MAX6947 Maxim Integrated Products, MAX6947 Datasheet

MAX6947

Manufacturer Part Number

MAX6947

Description

Constant-Current LED Drivers and I/O Expanders

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX6947.pdf (22 pages)

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The MAX6946/MAX6947 I

serial-interfaced peripherals provide microprocessors

with 10 I/O ports rated to 7V.

Each port can be configured as a 2.5mA to 20mA con-

stant-current LED driver (static or PWM), a 1.25mA to

10mA constant-current LED driver (static or PWM), an

open-drain logic output, or an overvoltage-protected

Schmitt logic input.

Analog and switching LED intensity control includes indi-

vidual 8-bit PWM control per output, individual 1-bit ana-

log current control (half/full scale) per output, and a global

3-bit DAC current control that applies to all LED outputs.

The MAX6946/MAX6947 can stagger the PWM timing of

the 10-port outputs in consecutively phased 45° incre-

ments. Staggering the outputs spreads the PWM load

currents over time in eight steps, helping to even out

the power-supply current and reduce the RMS current.

For a similar part with a SPI

compatible interface, refer to the MAX6966/MAX6967

data sheet.

19-0598; Rev 0; 7/06

*Purchase of I

Inc., or one of its sublicensed Associated Companies, conveys

a license under the Philips I

ponents in an I

to the I

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

SMBus is a trademark of Intel Corp.

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.

*MAX6946 ONLY.

**MAX6947 ONLY.

Cellular Phones

Portable Equipment

RGB LED Drivers

C Standard Specification as defined by Philips.

µC

SCL

SDA

C components from Maxim Integrated Products,

10-Port, Constant-Current LED Drivers and

C system, provided that the system conforms

I/O Expanders with PWM Intensity Control

Typical Operating Circuit

________________________________________________________________ Maxim Integrated Products

SCL

SDA

OSC*

RST

AD0**

General Description

MAX6946

MAX6947

+3.3V

C Patent Rights to use these com-

GND

-/QSPI

C*-/SMBus

LCD Backlights

Keypad Backlights

LED Status Indicators

Applications

-/ or MICROWIRE

-compatible,

LOGIC INPUT

+5V

♦ 400kb, 6V-Tolerant I

♦ 2.25V to 3.6V Operation

♦ I/O Ports Default to High Impedance (LEDs Off)

♦ I/O Port Inputs Are Overvoltage Protected to 7V

♦ I/O Port Outputs Are 7V-Rated Open-Drain, 10mA

♦ I/O Ports Support Hot Insertion

♦ Individual 8-Bit PWM Intensity Control for Each LED

♦ RST Input Clears Serial Interface and Can Exit

♦ MAX6946 OSC Input Allows for External PWM

♦ MAX6947 AD0 Input Selects from Four Slave

♦ Auto Ramp-Up Out of Shutdown and Up to 4s

♦ 0.8µA (typ) Shutdown Current

♦ -40°C to +125°C Temperature Range

Note: All devices are specified over the -40°C to +125°C operating

temperature range.

**EP = Exposed paddle.

+Denotes lead-free package.

†

MAX6946ATE+

MAX6947ATE+

Future product—contact factory for availability.

Interface

on Power-Up

or 20mA Constant-Current Static/PWM LED

Drivers, or Open-Drain Logic Outputs

Shutdown (Warm Start)

Clock Input

Addresses

Hold-Off Before Ramp-Down into Shutdown

PART

TOP VIEW

SDA

†

RST

SCL

PIN-PACKAGE

16 TQFN-EP**

TQFN (3mm x 3mm)

Ordering Information

C-/SMBus-Compatible Serial

MAX6946

MAX6947

Pin Configuration

MARK

ACG

TOP

ACF

GND

Features

T1633-4

CODE

PKG

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