AD7147AACBZ-RL

Overview

The AD7147AACBZ-RL is a CapTouch programmable controller for single-electrode capacitance sensors manufactured by Analog Devices Inc. It integrates a 16-bit, 250 kHz sigma-delta capacitance-to-digital converter (CDC) with 13 sensor inputs and on-chip environmental calibration logic. The device supports an SPI serial interface and operates from a 2.6 V to 3.6 V supply voltage. Key electrical parameters include a typical update rate of 9 ms for all 13 inputs, a resolution of 16 bits, and input ranges of ±8 pF. It features low power consumption, drawing 1 mA in full power mode and approximately 28.96 μA in low power mode.

Feature Summary

• Integrated 16-bit capacitance-to-digital converter with 13 sensor inputs
• On-chip automatic calibration and adaptive threshold logic
• SPI serial interface with separate VDRIVE level support
• Low power operation: 1 mA full power, ~29 μA low power

Applications

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

Procurement Notes

Verify the specific ordering suffix 'ACBZ-RL' against the manufacturer's official documentation to confirm package type and reel specifications. Ensure compatibility with the host processor's SPI interface timing requirements. Confirm that the WLCSP package handling procedures meet the moisture sensitivity level guidelines provided in the datasheet.

Selection Notes

Select this component for applications requiring high-resolution capacitive sensing with minimal external components. The AD7147A variant provides an SPI interface, whereas the AD7147A-1 offers I2C compatibility. Consider the 2.3 mm × 2.1 mm WLCSP package size for space-constrained designs. Ensure the host system can support the required software algorithms for scroll bars or wheels if high-resolution functions are needed.

Part Context

The AD7147A is part of the AD714x family of CapTouch controllers designed for portable electronics. It replaces traditional mechanical buttons with capacitive sensors, enabling thinner device profiles. The device includes a switch matrix to route sensor inputs to the CDC and utilizes on-chip RAM for storing calibration data to compensate for environmental changes.

Replacement Considerations

The AD7147ACPZ-1500RL7 is a compatible alternative within the same family but utilizes an LFCSP-24 package and an I2C interface instead of SPI. Verify pinout and interface differences before substitution.