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 低待機電流消耗（最大值）
? I2C 至并行端口擴展器
? 開漏電路低電平有效中斷輸出
? 工作電源電壓范圍為 2.3V 至 5.5V
? 可耐受 5V 電壓的 I/O 端口
? 400kHz 快速 I2C 總線
? 三個硬件地址引腳允許在 I2C/SMBus 上使用多達八個器件
? 與 PCA9534 結合使用時，允許在 I2C/SMBus 上使用多達 16 個器件 請參閱，Section 5了解 I2C 擴展器產品
? 輸入和輸出配置寄存器
? 極性反轉寄存器
? 內部上電復位
? 加電時所有通道均被配置為輸入
? 加電時無干擾
? SCL 和 SDA 輸入端裝有噪聲濾波器
? 具有最大高電流驅動能力的鎖存輸出，適用于直接驅動 LED
? 閂鎖性能超過 100mA，符合 JESD 78 II 類規(guī)范的要求
? ESD 保護性能超過 JESD 22 規(guī)范要求
? 2000V 人體放電模型 (A114-A)
? 200V 機器放電模型 (A115-A)
? 1000V 帶電器件模型 (C101)