PCF8575CDW

I/o Expanders Overview

The PCF8575CDW is a remote 16-bit I2C and SMBus low-power I/O expander manufactured by Texas Instruments. It provides general-purpose digital input and output expansion via the I2C bus interface, utilizing two bidirectional 8-bit ports (Port 0 and Port 1). The device operates within a supply voltage range of 1.8 V to 5.5 V and supports clock frequencies up to 400 kHz in Fast mode. It features an interrupt output pin that triggers when any input port state differs from its corresponding port register snapshot. The component is housed in a 24-pin TSSOP package and is rated for operation across a temperature range of -40°C to +85°C.

I/o Expanders Feature Summary

• Provides 16-bit I/O expansion through two independent 8-bit ports accessible via the I2C/SMBus serial interface.
• Includes an active-low interrupt output pin that signals microcontrollers when an input state deviates from the registered value.
• Supports multiple I2C stop conditions and allows flexible addressing using three hardware address pins.

I/o Expanders Applications

• Remote I/O expansion in embedded systems requiring additional digital inputs or outputs.
• Interface extension for microcontrollers with limited GPIO availability.
• SMBus-compatible peripheral control in industrial and consumer electronics.

I/o Expanders Procurement Notes

Verify the specific suffix 'CDW' corresponds to the 24-pin TSSOP package and commercial temperature grade (-40°C to +85°C) as defined in the official datasheet. Confirm RoHS compliance status and lead-free material declarations directly from the manufacturer's documentation prior to procurement. Ensure the ordering part number matches the required package variant and operating temperature range specifications.

I/o Expanders Selection Notes

Select this component when 16-bit I/O expansion is required over the I2C bus without configuration registers. Compare against PCA9535 if configuration registers are needed for power-on state control. Verify that the system voltage levels are compatible with the 1.8 V to 5.5 V operating range. Ensure the PCB layout accommodates the 24-pin TSSOP footprint and that the I2C bus capacitance limits are respected for reliable communication at the desired clock speed.

I/o Expanders Part Context

The PCF8575CDW belongs to the PCF8575C family of I/O expanders. It shares functional similarities with the PCA9535 but lacks configuration registers, making it simpler for basic I/O tasks. The 'CDW' suffix specifically denotes the TSSOP-24 package variant. This series is designed for low-power applications where minimal current consumption is critical during standby modes.

I/o Expanders Replacement Considerations

PCF8575CDWR: Same functionality in tape-and-reel packaging. PCA9535D: Similar 16-bit I/O expander but includes configuration registers for power-on state control. PCA9539D: Includes reset functionality and configuration registers. Verify package compatibility and electrical specifications before substitution.