CAT9554中文资料I/O Port Expander, I2C / SMBus, 8-Bit, with Active Low Interrupt数据手册ONSEMI规格书

描述 Description

The CAT9554 is a CMOS device that provides 8-bit parallel input/output port expansion for I²C and SMBus compatible applications. This I/O expander provides a simple solution in applications where additional I/Os are needed: sensors, power switches, LEDs, pushbuttons, and fans. The CAT9554 consist of an input port register, an output port register, a configuration register, a polarity inversion register and an I²C/SMBus-compatible serial interface. Any of the eight I/Os can be configured as an input or output by writing to the configuration register. The system master can invert the CAT9554 input data by writing to the active-high polarity inversion register. The CAT9554 features an active low interrupt output which indicates to the system master that an input state has changed. The device's extended addressing capability allows up to 8 devices to share the same bus. The CAT9554A is identical to the CAT9554 except the fixed part of the I²C slave address is different. This allows up to 16 of devices (eight CAT9554 and eight CAT9554A) to be connected on the same bus.

特性 Features

• 400 kHz I2C Bus Compatible
• 2.3 V to 5.5 V Operation
• Low Standby Current
• 5.0 V Tolerant I/Os
• 8 I/O Pins that Default to Inputs at Power-up
• High Drive Capability
• Individual I/O Configuration
• Polarity Inversion Register
• Active Low Interrupt Output
• Internal Power-on Reset
• No Glitch on Power-up
• Noise Filter on SDA/SCL Inputs
• Cascadable Up to 8 Devices
• Industrial Temperature Range

应用 Application

• Input/output Port Expansion for Extended Addressing Capability
• White Goods (Dishwashers, Washing Machines)
• Handheld Devices (Cell Phones, PDAs, Digital Cameras)
• Data Communications (Routers, Hubs and Servers)

简介

CAT9554属于集成电路（IC）的I/O扩展器。由制造生产的CAT9554I/O 扩展器该系列器件可与微控制器、微处理器或类似器件结合使用，目的是增加可用于连接外设的信号连接数量。典型的工作概念涉及使用串行通信，只需主机设备上的几根 I/O 线，即可读/写扩展器设备上的许多输入/输出引脚的状态。该技术的通信速度不佳，但连通性较高，最适合快速响应不是很关键的应用，例如许多人机界面应用。