AD7147WPACPZ-RL

Overview

The AD7147WPACPZ-RL is a CapTouch programmable controller for single-electrode capacitance sensors, manufactured by Analog Devices Inc. It integrates a 16-bit sigma-delta capacitance-to-digital converter (CDC) with 13 sensor inputs and an SPI-compatible serial interface. The device operates on a 2.6 V to 3.6 V supply and features on-chip environmental calibration logic. Key specifications include a typical update rate of 9 ms for all 13 inputs, femtofarad resolution, and low power consumption of 21.5 μA in idle mode. It is housed in a 24-lead, 4 mm × 4 mm LFCSP package and is qualified for automotive applications under AEC-Q100 standards.

Feature Summary

• Integrated 16-bit capacitance-to-digital converter with 13 sensor inputs
• On-chip automatic calibration and adaptive threshold logic
• SPI-compatible serial interface with separate VDRIVE level
• Automotive qualification (AEC-Q100)

Applications

• Cell phones
• Personal music and multimedia players
• Smart handheld devices
• Television, A/V, and remote controls
• Gaming consoles

Procurement Notes

Verify the specific suffix 'W' against the manufacturer's current ordering guide to confirm temperature range and packaging details. Confirm availability status as distribution channels may report limited stock or discontinuation notices. Ensure the host system supports the required SPI timing parameters and voltage levels defined in the datasheet.

Selection Notes

Select this component when an SPI interface is required for the host processor. The AD7147-1 variant offers I2C compatibility if that interface is preferred. Ensure the application requires single-electrode grounded sensors. Verify that the 13-channel input count meets the design requirements without needing additional external multiplexing.

Part Context

This part belongs to the AD7147 family of CapTouch controllers. It shares functional block diagrams and register maps with variants like the AD7147-1, differing primarily in the serial communication protocol. The 'W' suffix typically denotes a wider industrial temperature range compared to commercial grade parts within the same package.

Replacement Considerations

The AD7147-1ACPZ-RL is a direct pin-compatible alternative offering I2C interface instead of SPI. Other members of the AD714x family may require software adjustments due to register map differences.