PCA9554APWG4 Datasheet

Interface - I/O Expanders


This 8-bit I/O expander for the two-line bidirectional bus (I2 C) is designed for 2.3-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2 C interface [serial clock (SCL), serial data (SDA)].The PCA9554A 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 pullup 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. The system master can reset the PCA9554APWG4 in the event of a timeout or other improper operation by utilizing the power-on reset feature, which puts the registers in their default state and initializes the I2C/SMBus state machine. The PCA9554APWG4 open-drain interrupt (INT) 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. PCA9554APWG4 Features • I2C to Parallel Port Expander• Open-Drain Active-Low Interrupt Output• Three Hardware Address Pins Allow up to Eight Devices on the I2C/SMBus• Input/Output Configuration Register• Polarity Inversion Register• Internal Power-On Reset• Power-Up With All Channels Configured as Inputs• No Glitch on Power Up• Latched Outputs With High-Current Drive Maximum Capability for Directly Driving LEDs


[{"Name":"Number of I/Os:","Value":"8"},{"Name":"Maximum Operating Frequency:","Value":"400 kHz"},{"Name":"Operating Supply Voltage:","Value":"2.3 V to 5.5 V"},{"Name":"Operating Temperature Range:","Value":"- 40 C to + 85 C"},{"Name":" Operating Current:","Value":"104 uA"},{"Name":"Interrupt Output:","Value":"Yes"},{"Name":" Interface Type:","Value":"I2C, SMBus"},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""}]

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