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    Parts    AD7147PACPZ-1500R7
AD7147PACPZ-1500R7

ADIAD7147PACPZ-1500R7

Analog Devices Inc.
Capacitance-to-Digital Converter 16 b 250k I2C, Serial 24-LFCSP (4x4)
Active308 in stock
Datasheet Digi-Key Compare Prices

Overview

The AD7147PACPZ-1500R7 is a 16-bit CapTouch controller designed for use with capacitance sensors such as buttons, scroll wheels, and sliders. It features 13 input channels and an integrated 250kSPS ADC with an on-chip sequencer that simplifies the interface between the sensors and the host processor. The device includes automatic calibration and ambient compensation to ensure robust performance in changing environments.

Why Choose This Part

The AD7147 provides active shielding to reduce parasitic capacitance effects and improve signal-to-noise ratios. Its low power consumption and automatic calibration routines allow it to operate reliably in battery-powered applications without constant host CPU intervention.

Applications

Touch-Sensitive Controls
Implementing capacitive buttons, scroll wheels, and sliders in consumer electronics and white goods.
Proximity Detection
Enabling wake-on-approach features for handheld devices or industrial control panels.
Liquid Level Sensing
Measuring fluid levels in non-conductive containers using external capacitive electrodes.
Industrial Interfaces
Replacing mechanical switches with high-reliability, sealed touch interfaces for harsh environments.

Key Specifications

Type Capacitance-to-Digital Converter
Mounting Type Surface Mount
Data Interface I2C, Serial
Package / Case 24-WFQFN Exposed Pad, CSP
Voltage - Supply 2.6V ~ 3.6V
Resolution (Bits) 16 b
Number of Channels 13
Operating Temperature -40degC ~ 85degC
Voltage Supply Source Single Supply
Supplier Device Package 24-LFCSP (4x4)
Sampling Rate (Per Second) 250k

Getting Started

Start development by connecting the I2C interface to a microcontroller and utilizing the provided C-code drivers for sensor calibration. Design the sensor PCB following Analog Devices recommendations for ground planes and trace routing to minimize interference. The EVAL-AD7147EBZ evaluation board can be used to tune sensitivity and thresholds for specific electrode geometries.

AD7147 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Data Interface Stock
AD7147PACPZ-1500R7 (this part) I2C, Serial 308
AD7147ACPZ-1500RL7 I2C, Serial 1,652
AD7147ACPZ-500RL7 SPI 2,112
AD7147PACPZ-RL Reel SPI —
Also available as: AD7147ACPZ-REEL

Also Consider

FDC1004 TITexas Instruments - Provides 4 channels with integrated active shield drivers and is optimized for liquid level sensing.
CapSense Express IFXInfineon Technologies - Offers a hardware-configurable solution for up to 16 buttons without the need for firmware development.