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PCA9554AD,118 PDF预览

PCA9554AD,118

更新时间: 2024-01-16 23:01:00
品牌 Logo 应用领域
恩智浦 - NXP /
页数 文件大小 规格书
35页 590K
描述
8-bit I2C-bus and SMBus I/O port with interrupt

PCA9554AD,118 数据手册

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PCA9554; PCA9554A  
8-bit I2C-bus and SMBus I/O port with interrupt  
Rev. 9 — 19 March 2013  
Product data sheet  
1. General description  
The PCA9554 and PCA9554A are 16-pin CMOS devices that provide 8 bits of General  
Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and  
were developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders.  
The improvements include higher drive capability, 5 V I/O tolerance, lower supply current,  
individual I/O configuration, 400 kHz clock frequency, and smaller packaging. I/O  
expanders provide a simple solution when additional I/O is needed for ACPI power  
switches, sensors, push buttons, LEDs, fans, and so on.  
The PCA9554/PCA9554A consist of an 8-bit Configuration register (Input or Output  
selection); 8-bit Input Port register, 8-bit Output Port register and an 8-bit Polarity  
Inversion register (active HIGH or active LOW operation). The system master can enable  
the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for  
each input or output is kept in the corresponding Input Port or Output Port register. The  
polarity of the read register can be inverted with the Polarity Inversion register. All  
registers can be read by the system master. Although pin-to-pin and I2C-bus address  
compatible with the PCF8574 series, software changes are required due to the  
enhancements and are discussed in Application Note AN469.  
The PCA9554/PCA9554A open-drain interrupt output is activated when any input state  
differs from its corresponding Input Port register state and is used to indicate to the  
system master that an input state has changed. The power-on reset sets the registers to  
their default values and initializes the device state machine.  
Three hardware pins (A0, A1, A2) vary the fixed I2C-bus address and allow up to eight  
devices to share the same I2C-bus/SMBus. The PCA9554A is identical to the PCA9554  
except that the fixed I2C-bus address is different allowing up to sixteen of these devices  
(eight of each) on the same I2C-bus/SMBus.  
2. Features and benefits  
Operating power supply voltage range of 2.3 V to 5.5 V  
5 V tolerant I/Os  
Polarity Inversion register  
Active LOW interrupt output  
Low standby current  
Noise filter on SCL/SDA inputs  
No glitch on power-up  
Internal power-on reset  
8 I/O pins which default to 8 inputs  
0 Hz to 400 kHz clock frequency  

PCA9554AD,118 替代型号

型号 品牌 替代类型 描述 数据表
PCA9554AD,112 NXP

完全替代

8-bit I2C-bus and SMBus I/O port with interrupt
PCF8574T NXP

功能相似

Remote 8-bit I/O expander for I2C-bus
PCF8574AT NXP

功能相似

Remote 8-bit I/O expander for I2C-bus

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