AD7142ACPZ-1REEL

Overview

The AD7142ACPZ-1REEL is a programmable capacitance-to-digital converter (CDC) designed for capacitive touch sensor applications. It features a 16-bit sigma-delta converter with 14 input channels and an SPI-compatible serial interface. The device operates on a 2.6 V to 3.6 V supply, drawing less than 1 mA in full power mode and 50 µA in low power mode. It includes on-chip automatic calibration logic to compensate for environmental changes, ensuring reliable touch detection without external tuning components.

Feature Summary

• 14 capacitance sensor input channels routed through a switch matrix
• On-chip automatic calibration and adaptive threshold levels
• SPI-compatible serial interface with separate VDRIVE level
• Interrupt output and general-purpose I/O (GPIO)

Applications

• Personal music and multimedia players
• Cell phones and smart hand-held devices
• Digital still cameras
• Television, A/V, and remote controls
• Gaming consoles

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and reel specifications. Ensure compatibility with the host processor's SPI timing requirements before integration.

Selection Notes

Select this component for designs requiring high-resolution capacitive sensing with minimal host software overhead. The integrated calibration reduces the need for external RC tuning components, simplifying PCB layout compared to discrete solutions.

Part Context

This part belongs to the AD7142 family of capacitance-to-digital converters. The AD7142 variant specifically utilizes an SPI interface, whereas the AD7142-1 uses an I2C interface. Both share identical functional blocks and pinouts except for the serial communication pins.

Replacement Considerations

The AD7142-1 serves as a direct functional substitute if an I2C interface is required instead of SPI, maintaining identical pinout and performance characteristics.