PCF8575CDWE4

I/o Expanders Overview

The PCF8575CDWE4 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 interface, utilizing two ports (Port 0 and Port 1) to manage 16 bidirectional pins. The device operates within a supply voltage range of 1.8 V to 5.5 V and supports standard-mode clock frequencies up to 100 kHz and fast-mode up to 400 kHz. It features an interrupt output pin that signals logic changes on any GPIO pin. The component is housed in a 24-pin TSSOP package and is rated for an operating temperature range from -40°C to +85°C.

I/o Expanders Feature Summary

• Provides 16-bit I/O expansion through a two-wire I2C serial interface compatible with SMBus standards.
• Includes an active-low interrupt output pin that triggers when external inputs change state, facilitating efficient event detection without continuous polling.
• Supports flexible configuration allowing individual pins to be set as inputs or outputs independently.

I/o Expanders Applications

• Embedded systems requiring additional GPIO lines for sensor interfacing or peripheral control.
• Industrial control panels needing remote input/output management over I2C buses.
• Consumer electronics devices utilizing low-power I/O expansion for user interface elements.

I/o Expanders Procurement Notes

Verify the complete part number including the E4 suffix, which indicates lead-free status and RoHS compliance, against the manufacturer's current datasheet. Confirm the package type is TSSOP-24 and ensure the voltage and temperature ratings align with the target system requirements before procurement.

I/o Expanders Selection Notes

Select this component when a microcontroller requires more than its native GPIO count but lacks sufficient SPI or parallel interfaces. It is suitable for applications where power consumption must be minimized during idle states. Ensure the host controller supports I2C communication at the required speed and can handle the open-drain interrupt line configuration.

I/o Expanders Part Context

The PCF8575CDWE4 belongs to the PCF8575 family of I/O expanders, designed to extend the I/O capabilities of microcontrollers via the I2C bus. The 'E4' suffix specifically denotes a lead-free version compliant with European Union directives. This variant is functionally identical to the standard PCF8575CDW but adheres to stricter environmental manufacturing standards.

I/o Expanders Replacement Considerations

Direct functional substitutes include the PCF8575CDWR and PCF8575CDWG4. For pin-compatible alternatives with similar specifications, consider the PCA9535 series or the TCA9539, though interface and voltage differences should be verified.