NXP PCA9536D,118

PCA9536D,118 is an 8-pin CMOS device (4bit CMOS I²C-bus and SMBus I/O Port ) that provides 4-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. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc. The PCA9536 consists of a 4-bit configuration register (input or output selection), 4-bit input port register, 4-bit output port register and a 4-bit Polarity Inversion register (active HIGH or active LOW operation). The system host 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 Port or Output Port register. The polarity of the read register can be inverted with the Polarity Inversion register. All registers can be read by the system host.