TCA9554ADBR集成电路（IC）的I/O扩展器规格书PDF中文资料

TCA9554ADBR属于集成电路（IC）的I/O扩展器。由德州仪器制造生产的TCA9554ADBRI/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。

1 Features

1. I2C to Parallel Port Expander

. Open-Drain Active-Low Interrupt Output

. Operating Power-Supply Voltage Range of 1.65 V

to 5.5 V

. 5-V Tolerant I/O Ports

. 400-kHz Fast I2C Bus

. Three Hardware Address Pins Allow up to Eight

Devices on the I2C/SMBus

. Input and Output Configuration Register

. Polarity Inversion Register

. Internal Power-On Reset

. Low Standby Current Consumption

. Power-Up With All Channels Configured as Inputs

. No Glitch on Power Up

. Noise Filter on SCL/SDA Inputs

. Latched Outputs With High-Current Drive

Maximum Capability for Directly Driving LEDs

. Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

. ESD Protection Exceeds JESD 22

. 2000-V Human-Body Model (A114-A)

. 1000-V Charged-Device Model (C101)

2 Applications

. Servers

. Routers (Telecom Switching Equipment)

. Personal Computers

. Personal Electronics (for example: Gaming

Consoles)

. Industrial Automation

. Products With GPIO-Limited Processors

3 Description

The TCA9554A is a 16-pin device that provides 8 bits

of general purpose parallel input-output (I/O)

expansion for the two-line bidirectional I2C bus (or

SMBus) protocol. The device can operate with a

power supply voltage ranging from 1.65 V to 5.5 V.

The device supports both 100-kHz (Standard-mode)

and 400-kHz (Fast-mode) clock frequencies. I/O

expanders such as the TCA9554A provide a simple

solution when additional I/Os are needed for

switches, sensors, push-buttons, LEDs, fans, and

other similar devices.

The features of the TCA9554A include an interrupt

that is generated on the INT pin whenever an input

port changes state. The A0, A1, and A2 hardware

selectable address pins allow up to eight TCA9554A

devices on the same I2C bus. The device can also be

reset to its default sate by cycling the power supply

and causing a power-on reset.