PCF8575DBQRG4

I/o Expanders Overview

The PCF8575DBQRG4 is a remote 16-bit I2C and SMBus I/O expander manufactured by Texas Instruments. It provides eight general-purpose open-drain outputs (P0-P7) and eight general-purpose open-drain inputs (P8-P15), accessible via two I2C-bus serial interfaces. The device operates within a supply voltage range of 2.5 V to 5.5 V and features an interrupt output pin that signals state changes on any input. It supports standard mode (100 kHz) and fast mode (400 kHz) clock frequencies, with a typical operating current of 200 µA. The component is housed in a 24-pin VQFN package and is rated for operation between -40°C and +85°C.

I/o Expanders Feature Summary

• Provides 16 bidirectional I/O pins accessible via the I2C/SMBus interface
• Features an active-low interrupt output to signal input state changes without polling
• Supports low-power operation with high-speed CMOS technology
• Includes hardware address pins to allow multiple devices on the same bus

I/o Expanders Applications

• Remote I/O expansion for microcontroller systems with limited GPIO
• Keyboard and keypad scanning applications
• LED display driver interfaces
• Industrial control systems requiring isolated input monitoring

I/o Expanders Procurement Notes

Verify the specific suffix 'RG4' against the manufacturer's official documentation to confirm it denotes a lead-free, RoHS-compliant variant. Ensure the ordering part number matches the exact package type and tape-and-reel specifications required for your assembly process. Cross-reference the datasheet revision to confirm pinout compatibility before finalizing procurement.

I/o Expanders Selection Notes

Select this component when a design requires expanding GPIO capacity over a two-wire I2C or SMBus interface. It is suitable for applications needing both digital inputs and outputs with interrupt capabilities. Consider the 2.5 V to 5.5 V operating range to ensure compatibility with the system's logic levels. Verify that the 400 kHz maximum clock speed meets the communication requirements of the host controller.

I/o Expanders Part Context

The PCF8575 series is a family of remote 16-bit I/O expanders designed for I2C and SMBus buses. The PCF8575DBQRG4 belongs to this lineage, offering a cost-effective solution for adding I/O points. It shares functional similarities with other expanders like the PCA9535 but lacks configuration registers, making it simpler to use for basic input/output tasks. The 'DBQ' prefix typically indicates a VQFN-24 package.

I/o Expanders Replacement Considerations

Direct substitutes include the PCF8575PWRE4 and PCF8575RGER, which share identical electrical characteristics but differ in package style (TSSOP vs. VQFN). Other compatible devices from the same family include the PCF8575C variants. Ensure any replacement maintains the 16-bit I/O count and interrupt functionality.