AD7143ACPZ-1REEL

Overview

The AD7143ACPZ-1REEL is a programmable capacitance-to-digital converter (CDC) designed for capacitive touch sensor applications. It features an integrated 16-bit sigma-delta converter with eight input channels routed through a switch matrix. The device operates on a 2.6 V to 3.6 V supply and includes automatic environmental calibration logic, adaptive thresholds, and an I2C-compatible serial interface with a separate VDRIVE pin. It supports full power mode with less than 1 mA current consumption and low power mode at 50 μA. The component is housed in a 16-lead, 4 mm × 4 mm LFCSP-VQ package.

Feature Summary

• Integrated automatic calibration logic compensates for environmental changes such as humidity and temperature variations without external components.
• On-chip sequencer manages conversion stages while adaptive threshold levels adjust sensitivity automatically.
• I2C-compatible serial interface allows communication with host controllers using a separate voltage domain via the VDRIVE pin.
• Programmable interrupt output signals host processors regarding sensor activation or conversion completion.

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 manufacturer documentation to confirm packaging configuration. Ensure compatibility with the required I2C voltage levels by checking the VDRIVE specification. Confirm that the LFCSP-VQ package dimensions align with the target PCB footprint design guidelines provided in the datasheet.

Selection Notes

Select this component when designing systems requiring high-resolution capacitive sensing with minimal external circuitry. Consider the low power mode operation for battery-operated portable devices where standby current is critical. Evaluate the need for host software if implementing complex sensors like scroll bars, as simple button arrays require no additional code.

Part Context

This part belongs to the AD7143 series of capacitance-to-digital converters from Analog Devices. It serves as a dedicated controller for single-electrode capacitance sensors, offering a complete solution for user input methods in consumer electronics. The device integrates necessary signal conditioning and digital logic to simplify system design.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the verified source material. Designers should consult official Analog Devices documentation for cross-reference information or contact technical support for compatible alternatives.