PCF8575DB

I/o Expanders Overview

The PCF8575DB is a remote 16-bit I2C and SMBus low-power I/O expander manufactured by Texas Instruments. It provides eight hardware address pins to allow up to eight devices on the bus without external logic. The device operates within a supply voltage range of 2.5 V to 5.5 V and supports clock frequencies up to 400 kHz. It features an interrupt output pin for efficient event handling and includes ESD protection rated at 2 kV. The component is housed in a 24-pin SOIC package and functions as a quasi-bidirectional I/O port interface.

I/o Expanders Feature Summary

• Provides sixteen quasi-bidirectional I/O ports accessible via standard I2C communication protocols.
• Includes a dedicated interrupt output pin that signals state changes to the microcontroller.
• Supports multiple device addressing through configurable hardware address pins.
• Integrates electrostatic discharge protection on all input and output lines.

I/o Expanders Applications

• Expanding microcontroller input/output capabilities in embedded systems
• Interface modules for industrial control panels requiring additional digital I/O
• Consumer electronics devices with limited MCU pin availability

I/o Expanders Procurement Notes

Verify the specific suffix against the manufacturer's current naming convention, as legacy part numbers may have evolved. Confirm the package type matches the required PCB footprint and ensure the operating temperature range aligns with the target application environment before finalizing procurement.

I/o Expanders Selection Notes

Select this component when a system requires sixteen additional digital I/O lines over a two-wire serial interface. Ensure the host microcontroller supports I2C or SMBus protocols and can handle the required pull-up resistor configurations for reliable data transmission across the bus.

I/o Expanders Part Context

This component belongs to the PCF8575 family of remote I/O expanders designed for low-voltage applications. It serves as a bridge between high-speed microcontrollers and slower peripheral devices, allowing designers to conserve valuable MCU pins while maintaining robust communication standards.

I/o Expanders Replacement Considerations

PCF8575CDWR

I/o Expanders FAQ

How many devices can be connected to a single I2C bus using this expander?

Up to eight PCF8575 devices can be connected to a single I2C bus by configuring the three hardware address pins.

What is the maximum clock frequency supported by the I2C interface?

The I2C interface supports a maximum clock frequency of 400 kHz.

Does the device include protection against electrostatic discharge?

Yes, the device includes ESD protection rated at 2 kV on its input and output lines.