TCA9538DBR集成电路（IC）的I/O扩展器规格书PDF中文资料

TCA9538DBR属于集成电路（IC）的I/O扩展器。由德州仪器制造生产的TCA9538DBRI/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• Low Standby Current Consumption

• I2C to Parallel Port Expander

• Open-Drain Active-Low Interrupt Output

• Active-Low Reset Input

• Operating Power-Supply Voltage Range of 1.65 V

to 5.5 V

• 5-V Tolerant I/O Ports

• 400-kHz Fast I2C Bus

• Two Hardware Address Pins Allow up to Four

Devices on the I2C/SMBus

• Input and Output Configuration Register

• Polarity Inversion Register

• 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 (example: Gaming Consoles)

• Industrial Automation

• Products With GPIO-Limited Processors

3 Description

The TCA9538 is a 16-pin device that provides 8 bits

of general purpose parallel input and 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 TCA9538 provide a simple

solution when additional I/Os are needed for

switches, sensors, push-buttons, LEDs, fans, etc.

The features of the TCA9538 include an interrupt that

is generated on the INT pin whenever an input port

changes state. The A0 and A1 hardware selectable

address pins allow up to four TCA9538 devices on

the same I2C bus. The device can also be reset to its

default sate by using the RESET feature or by cycling

the power supply and causing a power-on reset.