CAT9552WI datasheet(1/18 Pages) ONSEMI

Part #	CAT9552WI

Description	16-Channel I2C-bus LED Driver with Programmable Blink Rate

PDF	18 Pages

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Manufacturer	ONSEMI [ON Semiconductor]

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CAT9552

16-Channel I

2C-bus LED Driver with

Programmable Blink Rate

FEATURES

16 LED drivers with On/Off and programmable

blink rate control

2 selectable, programmable blink rates:

– frequency: 0.172Hz to 44Hz

– duty cycle: 0% to 99.6%

16 open drain outputs drive 25mA each

I/Os can be used as GPIOs

400kHz I

2C bus compatible

2.3V to 5.5V operation

5V tolerant I/Os

Active low reset input

RoHS-compliant 24-Lead SOIC, TSSOP and

24-pad TQFN (4 x 4mm) packages

APPLICATIONS

Office machines

Appliance control panels

Alarm systems

Point of sale displays

DESCRIPTION

The CAT9552 is a 16-channel, parallel input/output

port expander optimized for LED On/Off and blinking

control. Each individual LED may be turned ON, OFF,

or set to blinking at one of two programmable rates.

The CAT9552 is compatible with I

2C and SMBus

applications where it is desireable to limit the bus

traffic or free-up the bus master’s internal timer. Three

address pins allow up to eight CAT9552 devices to

occupy the same bus.

The CAT9552 contains an internal oscillator and two

PWM signals, which drive the LED outputs. The user

may program the period and duty cycle for each

individual PWM signal. After an initial set-up command

to program the Blink Rate 1 and Blink Rate 2 (frequency

and duty cycle), only one command from the bus master

is required to turn each individual open drain output ON,

OFF, or cycle at Blink Rate 1 or Blink Rate 2. Each open

drain LED output can sink a maximum current of 25mA.

The total continuous current sunk by all I/Os must not

exceed 200mA per package.

TYPICAL APPLICATION CIRCUIT

CAT9552

GPIOs

I2C/SMBus

Master

VSS

A0

A1

A2

RS0

3 x 10kΩ

RS1

RS11

5 V

LED11

LED1

LED0

VCC

LED12

LED15

SDA

5 V

SCL

SDA

SCL

RESET

For Ordering Information details, see page 17.

Notes:

LED0 to LED11 are shown being used as LED drivers

LED12 to LED15 are used as standard GPIOs

1

Doc. No. MD-9005 Rev D

Characteristics subject to change without notice

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ON Semiconductor	CAT9552WI	192Kb / 17P	16-Channel I2C-bus LED Driver with Programmable Blink Rate Doc. No. MD-9005 Rev B
ON Semiconductor	CAT9552WI-T1	192Kb / 17P	16-Channel I2C-bus LED Driver with Programmable Blink Rate Doc. No. MD-9005 Rev B

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