PCA9534A中文资料具有中断和配置寄存器的 8 位 2.3V 至 5.5V I2C/SMBus I/O 扩展器数据手册TI规格书

描述 Description

The PCA9534A and PCA9534 are identical, except for their fixed I2C address. This allows for up to 16 of these devices (8 of each) on the same I2C bus.

INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C bus. Thus, the PCA9534A can remain a simple slave device.

The device’s outputs (latched) have high-current drive capability for directly driving LEDs. It has low current consumption.

Three hardware pins (A0, A1, and A2) are used to program and vary the fixed I2C address and allow up to eight devices to share the same I2C bus or SMBus.

The PCA9534A is pin-to-pin and I2C address compatible with the PCF8574A. However, software changes are required due to the enhancements in the PCA9534A over the PCF8574A.

The PCA9534A is a low-power version of the PCA9554A. The only difference between the PCA9534A and PCA9554A is that the PCA9534A eliminates an internal I/O pullup resistor, which dramatically reduces power consumption in the standby mode when the I/Os are held low.

特性 Features

• 1µA 低待机电流消耗（最大值）
• 开漏电路低电平有效中断输出
• 可耐受 5V 电压的 I/O 端口
• 三个硬件地址引脚允许在 I2C/SMBus 上使用多达八个器件
• 输入和输出配置寄存器
• 内部上电复位
• 加电时无干扰
• 具有最大高电流驱动能力的锁存输出，适用于直接驱动 LED
• ESD 保护性能超过 JESD 22 规范要求
• 200V 机器放电模型 (A115-A)
• 1000V 带电器件模型 (C101)