The PCA9554PW is a remote 8-bit I²C and SMBus I/O Expander with interrupt output and configuration registers designed for VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I²C interface (serial clock (SCL), serial data (SDA)). The PCA9554 consists of one 8-bit configuration (input or output selection), input, output and polarity inversion (active high or active low) registers. At power on, the I/Os are configured as inputs with a weak pull up to VCC. However, 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 input port register can be inverted with the polarity inversion register. All registers can be read by the system master.
● I²C to parallel port expander
● Open-drain active-low interrupt output
● Three hardware address pins allow up to eight devices
● Input/output configuration register
● Polarity inversion register
● Internal power-on reset
● Power-up with all channels configured as inputs
● No glitch on power up
● Latch-up performance exceeds 100mA per JESD 78
● ESD protection exceeds JESD 22
● Green product and no Sb/Br
●This device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
