PCA9575PW2,118

I/o Expanders Overview

The PCA9575PW2,118 is a 16-bit I/O expander in a TSSOP28 package. It operates on a core supply voltage of 1.1 V to 3.6 V and supports separate I/O bank supplies within the same range for level translation. The device features a 400 kHz I2C-bus interface and provides 16 configurable GPIOs organized into two banks. It includes an open-drain interrupt output, active LOW reset input, and four hardware address select pins allowing up to 16 devices on one bus. Operating temperature ranges from -40 °C to +85 °C.

I/o Expanders Feature Summary

• Separate supply rails enable voltage level shifting between logic and I/O banks
• Hardware selectable target addresses via dedicated address pins
• Programmable bus-hold and pull-up/pull-down configurations per pin
• Active LOW reset input initializes device to default power-up state

I/o Expanders Applications

• Cell phones
• Multi-voltage environments
• Battery operated mobile gadgets
• Industrial control
• Medical equipment

I/o Expanders Procurement Notes

Verify the ordering suffix matches the required packaging format. Confirm the specific package variant aligns with board layout constraints. Ensure the manufacturer source documentation is current before finalizing component selection.

I/o Expanders Selection Notes

Select this part when hardware address configuration is required for multiple devices on a single bus. Verify that the system design accommodates separate supply rails for the core and I/O banks to utilize the level translation capabilities effectively.

I/o Expanders Part Context

This component belongs to the PCA9575 family of low voltage GPIO expanders. It enhances standard I2C interfaces by providing independent voltage domains for inputs and outputs, facilitating communication between processors and peripherals operating at different voltage levels.

I/o Expanders Replacement Considerations

PCA9575PW1,118 (TSSOP24 version)

I/o Expanders FAQ

How many devices can be connected on a single I2C bus?

Up to 16 PCA9575 devices can be connected using the four hardware address select pins available on the 28-pin package.

What is the function of the RESET pin?

The active LOW reset input initializes the I/O ports as inputs, sets registers to default values, and resets the device state machine.

Can the polarity of input data be inverted?

Yes, the Polarity Inversion register allows the user to invert the polarity of the Input port register data for both banks.