PCA9536中文资料具有配置寄存器的 4 位 2.3V 至 5.5V I2C/SMBus I/O 扩展器数据手册TI规格书

描述 Description

This 4-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.3-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)]. The PCA9536 features 4-bit Configuration (input or output selection), Input Port, Output Port, and Polarity Inversion (active high or active low) registers. At power on, the I/Os are configured as inputs with a weak pullup to VCC. However, the system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. If no signals are applied externally to the PCA9536, the voltage level is 1, or high, because of the internal pullup resistors. The data for each input or output is stored in the corresponding Input Port or Output Port register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. All registers can be read by the system master. The system master can reset the PCA9536 in the event of a timeout or other improper operation by utilizing the power-on reset feature, which puts the registers in their default state and initializes the I2C/SMBus state machine. The device's outputs (latched) have high-current drive capability for directly driving LEDs. It has low current consumption.

特性 Features

• Available in the Texas Instruments NanoFree Package
• Low Standby Current Consumption of 1 μA Max
• I2C to Parallel Port Expander
• Operating Power-Supply Voltage Range of 2.3 V to 5.5 V
• 5-V Tolerant I/O Ports
• 400-kHz Fast I2C Bus
• Input/Output Configuration Register
• Polarity Inversion Register
• Internal Power-On Reset
• No Glitch on Power Up
• Power-Up With All Channels Configured as Inputs
• 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)
• 200-V Machine Model (A115-A)
• 1000-V Charged-Device Model (C101)

简介

PCA9536属于集成电路（IC）的I/O扩展器。由TI制造生产的PCA9536I/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。