PCA9552D,118【PDF 1/28 页】IC LED DRIVER BLINKER 24-SOIC

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录349

[1页]2页 3页 4页 5页

PCA9552

16-bit I 2 C-bus LED driver with programmable blink rates

Rev. 05 — 9 March 2006

Product data sheet

1. General description

The PCA9552 LED blinker blinks LEDs in I 2 C-bus and SMBus applications where it is

necessary to limit bus traf?c or free up the I 2 C-bus master's (MCU, MPU, DSP, chip set,

etc.) timer. The uniqueness of this device is the internal oscillator with two programmable

blink rates. To blink LEDs using normal I/O expanders like the PCF8574 or PCA9554, the

bus master must send repeated commands to turn the LED on and off. This greatly

increases the amount of traf?c on the I 2 C-bus and uses up one of the master's timers. The

PCA9552 LED blinker instead requires only the initial setup command to program

BLINK RATE 1 and BLINK RATE 2 (that is, the frequency and duty cycle) for each

individual output. From then on, only one command from the bus master is required to

turn each individual open-drain output on, off, or to cycle at BLINK RATE 1 or

BLINK RATE 2. Maximum output sink current is 25 mA per bit and 200 mA per package.

Any bits not used for controlling the LEDs can be used for General Purpose Parallel

Input/Output (GPIO) expansion.

The active LOW hardware reset pin (RESET) and Power-On Reset (POR) initializes the

registers to their default state, all zeroes, causing the bits to be set HIGH (LED off).

Three hardware address pins on the PCA9552 allow eight devices to operate on the same

bus.

2. Features

s 16 LED drivers (on, off, ?ashing at a programmable rate)

s 2 selectable, fully programmable blink rates (frequency and duty cycle) between

0.172 Hz and 44 Hz (5.82 seconds and 0.023 seconds)

s Input/outputs not used as LED drivers can be used as regular GPIOs

s Internal oscillator requires no external components

s I 2 C-bus interface logic compatible with SMBus

s Internal power-on reset

s Noise ?lter on SCL/SDA inputs

s Active LOW reset input

s 16 open-drain outputs directly drive LEDs to 25 mA

s Edge rate control on outputs

s No glitch on power-up

s Supports hot insertion

s Low standby current

s Operating power supply voltage range of 2.3 V to 5.5 V

s 0 Hz to 400 kHz clock frequency

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式