深圳市迅丰达电子科技有限公司

PCA9555PW

16-bitI²C--bus and SMBus I/O port with interrupt   16位I²C-总线和SMBusI/O端口与中断

PCA9555PW的描述：

The PCA9555 is a 24-pin CMOS device that provides 16 bits of General Purpose parallel

Input/Output (GPIO) expansion for I²C-bus/SMBus applications and was developed to

enhance the NXP Semiconductors family of I²C-bus I/O expanders.

The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.

The PCA9555 consists of two 8-bit Configuration (Input or Output selection); Input, Output

and Polarity Inversion (active HIGH or active LOW operation) registers. The system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each Input or Output is kept in the corresponding Input or Output register.

 The polarity of the read register can be inverted with the Polarity Inversion register. All registers can be read by the system master. Although pin-to-pin and I²C-bus address compatible with the PCF8575, software changes are required due to the enhancements, and are discussed in Application Note AN469.

The PCA9555 open-drain interrupt output is activated when any input state differs from its

corresponding input port register state and is used to indicate to the system master that

an input state has changed. The power-on reset sets the registers to their default values

and initializes the device state machine.

Three hardware pins (A0, A1, A2) vary the fixed I²C-bus address and allow up to eight

devices to share the same I²C-bus/SMBus. The fixed I²C-bus address of the PCA9555 is

the same as the PCA9554, allowing up to eight of these devices in any combination to

share the same I²C-bus/SMBus.

类别：集成电路 (IC)

接口：I2C，SM 总线

中断输出：是

安装类型：表面贴装

封装/外壳：24-TSSOP（0.173"，4.40mm 宽）

供应商设备封装：24-TSSOP