Datasheet > PCA9553D

PCA9553D

更新时间： 2024-01-27 21:04:45

品牌	Logo	应用领域
恩智浦 - NXP		驱动器
页数	文件大小	规格书
18页	130K
描述
4-bit I2C LED driver with programmable blink rates

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技术参数
数据手册

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PCA9553D 技术参数

Source Url Status Check Date：	2013-06-14 00:00:00	是否无铅：	含铅
是否Rohs认证：	符合	生命周期：	Obsolete
Reach Compliance Code：	unknown	风险等级：	5.83
Base Number Matches：	1

PCA9553D 数据手册

Philips Semiconductors

Product data sheet

4-bit I²C LED driver with programmable blink rates

PCA9553

PWM1 — PWM REGISTER 1

PINS USED AS GENERAL PURPOSE I/Os

LED pins not used to control LEDs can be used as general purpose

I/Os.

bit

default

For use as input: Set LEDx to high-impedance (01) and then read

the pin state via the input register.

The PWM1 register determines the duty cycle of BLINK1. The

outputs are LOW (LED off) when the count is less than the value in

PWM1 and HIGH when it is greater. If PWM1 is programmed with

00h, then the PWM1 output is always LOW.

For use as output: Connect external pull-up resistor to the pin and

size it according to the DC recommended operating characteristics.

LED output pin is HIGH when the output is programmed as

high-impedance, and LOW when the output is programmed LOW

through the “LED selector” register. The output can be pulse-width

controlled when PWM0 or PWM1 are used.

256 – PWM1

The duty cycle of BLINK1 is:

256

LS0 — LED SELECTOR

LED3

LED2

LED 1

LED 0

bit

POWER-ON RESET

When power is applied to V , an internal Power-On Reset holds

default

the PCA9553 in a reset condition until V has reached V

this point, the reset condition is released and the PCA9553 registers

are initialized to their default states, with all outputs in the off state.

. At

POR

The LSx LED select registers determine the source of the LED data.

00 = Output is set LOW (LED on)

01 = Output is set Hi-Z (LED off – default)

10 = Output blinks at PWM0 rate

Thereafter, V must be lowered below 0.2 V to reset the device.

11 = Output blinks at PWM1 rate

2004 Oct 01

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