PCA9551D

更新时间： 2024-01-19 08:01:52

品牌	Logo	应用领域
恩智浦 - NXP		驱动器
页数	文件大小	规格书
21页	162K
描述
8-bit I2C LED driver with programmable blink rates

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PCA9551D 数据手册

Philips Semiconductors

Product data sheet

8-bit I²C LED driver with

programmable blink rates

PCA9551

DESCRIPTION

The PCA9551 LED Blinker blinks LEDs in I C-bus and SMBus

applications where it is necessary to limit bus traffic or free up the

I C Master’s (MCU, MPU, DSP, chipset, 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 traffic on

the I C-bus and uses up one of the master’s timers. The PCA9551

LED Blinker instead requires only the initial set up command to

program BLINK RATE 1 and BLINK RATE 2 (i.e., 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 100 mA

per package.

FEATURES

• 8 LED drivers (on, off, flashing at a programmable rate)

• 2 selectable, fully programmable blink rates (frequency and duty

cycle) between 0.148 Hz and 38 Hz (6.74 and 0.026 seconds)

• Input/outputs not used as LED drivers can be used as regular

GPIOs

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

Purpose Parallel Input/Output (GPIO) expansion.

• Internal oscillator requires no external components

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).

• I C-bus interface logic compatible with SMBus

• Internal power-on reset

• Noise filter on SCL/SDA inputs

• Active-LOW reset input

Three hardware address pins on the PCA9551 allow eight devices

to operate on the same bus.

• 8 open drain outputs directly drive LEDs to 25 mA

• Edge rate control on outputs

• No glitch on power-up

• Supports hot insertion

• Low stand-by current

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

• 0 to 400 kHz clock frequency

• ESD protection exceeds 2000 V HBM per JESD22-A114,

150 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101

• Latch-up testing is done to JESDEC Standard JESD78 which

exceeds 100 mA

• Packages offered: SO16, TSSOP16, HVQFN16

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

TOPSIDE MARK

DRAWING NUMBER

16-pin plastic SO

16-pin plastic TSSOP

16-pin plastic HVQFN

–40 °C to +85 °C

PCA9551D

PCA9551PW

PCA9551BS

PCA9551D

PCA9551

9551

SOT109-1

SOT403-1

SOT629-1

Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging.

I C is a trademark of Philips Semiconductors Corporation.

2004 Oct 01

123 4 5 6 7...21

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与PCA9551D相关器件

型号	品牌	描述	获取价格	数据表
PCA9551D,112	NXP	PCA9551 - 8-bit I2C-bus LED driver with programmable blink rates SOP 16-Pin	获取价格
PCA9551D,118	NXP	PCA9551 - 8-bit I2C-bus LED driver with programmable blink rates SOP 16-Pin	获取价格
PCA9551D-T	NXP	8-bit I2C-bus LED driver with programmable blink rates	获取价格
PCA9551PW	NXP	8-bit I2C LED driver with programmable blink rates	获取价格
PCA9551PW,112	NXP	PCA9551 - 8-bit I2C-bus LED driver with programmable blink rates TSSOP 16-Pin	获取价格
PCA9551PW,118	NXP	PCA9551 - 8-bit I2C-bus LED driver with programmable blink rates TSSOP 16-Pin	获取价格

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