PCF8885T/1,518

Overview

The PCF8885T/1,518 is a capacitive 8-channel touch and proximity sensor interface manufactured by NXP Semiconductors. It utilizes the EDISEN method to detect static capacitance changes on remote sensing plates connected via coaxial cable. The device features continuous auto-calibration, adjustable sensitivity and response time, and supports matrix arrangements with interrupt generation for simultaneous activations. It operates within a voltage range of 2.5 V to 5.5 V and includes a low-power sleep mode with current consumption below 100 nA. Communication is handled via an I²C Fast-mode Plus interface, supporting two addresses and cascading capabilities. The component is housed in a TSSOP28 package.

Feature Summary

• Capacitive sensing with 8 independent channels and remote plate support
• Continuous auto-calibration for static capacitance compensation
• Configurable switching modes including direct and latching operations
• Low-power sleep mode with minimal current consumption

Applications

• Replacing mechanical switches in sealed environments
• Hermetically sealed keyboard keys
• Medical application switches
• Explosive environment switches
• Audio control interfaces (on/off, volume)

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging and revision levels. Confirm availability status as distribution channels may vary. Ensure compatibility with system voltage requirements and I²C bus specifications before integration.

Selection Notes

Select this component for applications requiring robust capacitive sensing through insulating materials like acrylic glass. Consider the matrix arrangement features if multiple sensors are needed in a confined space. Evaluate power constraints to utilize the sleep mode effectively. Ensure the design accommodates the TSSOP28 package dimensions and pin configuration.

Part Context

The PCF8885 belongs to NXP's family of capacitive sensor interfaces designed for touch and proximity detection. It is part of a series that includes variants like the PCF8883, offering different channel counts and package options. This specific model focuses on providing eight channels with advanced calibration features for reliable operation in various industrial and consumer applications.

Replacement Considerations

PCF8885TS/1,118 is a compatible variant with identical functionality but potentially different packaging or marking standards. Verify pinout and register compatibility when substituting.