PCA8885TS/Q900/1,1

Overview

The PCA8885TS/Q900/1,1 is an AEC-Q100 compliant capacitive touch and proximity sensor featuring eight independent sensing channels. It utilizes a patented EDISEN method with continuous auto-calibration to detect static capacitance changes on remote sensing plates connected via coaxial cable. The device supports matrix arrangements, adjustable response times, and sensitivity settings. 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 through an I2C Fast-mode Plus interface, supporting two addresses and cascading capabilities.

Feature Summary

• Supports dynamic touch and proximity detection across eight independently operating sensor channels with remote plate connectivity.
• Features continuous auto-calibration and digital processing to compensate for static capacitance changes and cope with up to 6 mm of acrylic glass.
• Offers flexible switching modes including direct and latching options, along with N-key, 1-key, and 2-key press configurations.
• Provides interrupt signaling via a dedicated output pin or over the I2C-bus, compatible with I2C Fast-mode Plus.

Applications

• Replacing mechanical switches in hermetically sealed keyboards
• Vandal-proof switches for medical or industrial environments
• Audio control interfaces for volume and channel adjustment
• Switches integrated into upholstery, leather, handles, mats, carpets, tiles, and glass

Procurement Notes

Verify the specific ordering suffix /Q900/1,1 corresponds to the tape and reel delivery form as documented in the official NXP datasheet. Confirm that the component meets AEC-Q100 automotive qualification requirements if intended for automotive applications. Ensure the TSSOP28 package dimensions align with the target PCB layout constraints before finalizing procurement orders.

Selection Notes

Select this component when an eight-channel capacitive solution with remote sensing capability is required. Consider the PCA8885 for applications needing auto-calibration to handle environmental drift or cover materials like acrylic glass. Evaluate the need for matrix arrangement support and low-power sleep modes for battery-operated devices. Verify I2C compatibility and address configuration needs for system integration.

Part Context

The PCA8885 belongs to NXP's family of capacitive touch sensors designed for robust human-machine interfaces. It is part of the broader portfolio addressing automotive and industrial control panel needs. The TS variant denotes the TSSOP28 plastic small outline package. This specific part number represents the standard version available in tape and reel packaging for automated assembly processes.

Replacement Considerations

No public confirmed substitute part numbers are listed in the provided documentation. Designers should verify functional equivalence regarding channel count, interface protocol, and package dimensions if considering alternative components from other manufacturers.

FAQ

How does the PCA8885 handle static capacitance changes?

The device uses a patented EDISEN method with continuous auto-calibration to automatically compensate for changes in static capacitances, ensuring stable operation without manual tuning.

Can the PCA8885 be used in a sensor matrix arrangement?

Yes, the PCA8885 supports matrix arrangements. It offers 1-key and 2-key modes that suppress additional channel outputs when multiple channels are activated simultaneously, preventing accidental triggers.

What is the power consumption in sleep mode?

In sleep mode, the current consumption (IDD) is less than 100 nA, making it suitable for low-power battery-operated applications.