PCA9535数据手册TI中文资料规格书

描述 Description

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 PCA9535 can remain a simple slave device.

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

Although pin-to-pin and I2C address compatible with the PCF8575, software changes are required due to the enhancements.

The PCA9535 is identical to the PCA9555, except for the removal of the internal I/O pullup resistor, which greatly reduces power consumption when the I/Os are held low.

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 fixed I2C address of the PCA9535 is the same as the PCA9555, PCF8575, PCF8575C, and PCF8574, allowing up to eight of these devices in any combination to share the same I2C bus or SMBus.

特性 Features

• 1µA 低待机电流消耗（最大值）
• I2C 至并行端口扩展器
• 开漏电路低电平有效中断输出
• 可耐受 5V 电压的 I/O 端口
• 兼容大多数微控制器
• 400kHz 快速 I2C 总线
• 针对多达 8 个器件使用的 3 个硬件地址引脚寻址
• 极性反转寄存器
• 具有高电流驱动能力的锁存输出，用于直接驱动 LED
• 闩锁性能超过 100mA，符合 JESD 78 II 类规范的要求
• ESD 保护性能超过 JESD 22 规范要求
• 2000V 人体放电模型 (A114-A)
• 1000V 带电器件模型 (C101)