AD7147A-1ACBZ-RL

Overview

The AD7147A-1ACBZ-RL is a CapTouch programmable controller for single-electrode capacitance sensors, manufactured by Analog Devices Inc. It integrates a 16-bit capacitance-to-digital converter (CDC) with an I2C-compatible serial interface. The device features 13 sensor inputs and operates on a 2.6 V to 3.6 V supply voltage. Key specifications include a typical update rate of 9 ms across all inputs, femtofarad resolution, and low power consumption of 28.96 μA in low power mode. It includes on-chip automatic calibration logic and adaptive threshold levels to compensate for environmental changes.

Feature Summary

• 13 Capacitance Sensor Inputs: Supports up to 13 external single-electrode capacitive sensors via CIN0-CIN12 pins.
• I2C-Compatible Interface: Utilizes an I2C-compatible serial interface with separate VDRIVE level for logic compatibility.
• On-Chip Calibration: Features automatic conversion sequencer and environmental calibration logic to compensate for ambient changes without external components.
• Low Power Operation: Offers full power mode (1 mA) and low power mode (28.96 μA typical) with automatic wake-up capabilities.

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 current datasheet to confirm package type and reel quantity. Ensure the host system supports the I2C protocol required by the AD7147A-1 variant. Confirm that the VDRIVE pin voltage aligns with the host processor's logic levels for reliable communication.

Selection Notes

Select the AD7147A-1 variant specifically when an I2C interface is required; the standard AD7147A uses SPI. Ensure the application requires 13 sensor channels, as the AD7148 offers fewer inputs. Verify that the PCB layout can accommodate the WLCSP package dimensions and that the BIAS pin can be connected to a 100 nF capacitor for proper operation.

Part Context

The AD7147A-1 belongs to the AD714x family of CapTouch controllers designed for portable electronics. It serves as a specialized data acquisition component for converting analog capacitance changes into digital values. The -1 suffix denotes the I2C interface variant, distinguishing it from the SPI-based AD7147A. This part enables novel user input methods like buttons, scroll bars, and wheels in thin-profile designs.

Replacement Considerations

The AD7147ACPZ-1500RL7 is an I2C-compatible variant within the same series but utilizes an LFCSP-24 package instead of WLCSP. Pinout and footprint differences require PCB redesign if substituting directly. Both parts share similar functional capabilities regarding capacitance sensing and calibration.