Products > Sensors, Transducers > AD7147
AD7147 QFN
  • AD7147
  • AD7147 0
  • AD7147 1
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CapTouch⑩ Programmable Controller for Single-Electrode Capacitance Sensors

Manufacturer :
Analog Devices, Inc
Package/Case :
Product Categories :
Integrated/Special Purpose A/D Converters ; Capacitive to Digital & Touch Screen Controllers
AD7147 PDF
RoHs Status:
Lead free/RoHS Compliant

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AD7147 Product Details

The AD7147 is an integrated CDC with on-chip environmental calibration. The CDC has 13 inputs channeled through a switch matrix to a 16-bit, 250 kHz sigma-delta (Σ-Δ) converter. The CDC is capable of sensing changes in the capacitance of the external sensors and uses this information to register a sensor activation. By programming the registers, the user has full control over the CDC setup.

High resolution sensors require minor software to run on the host processor.

The AD7147 is designed for single electrode capacitance sensors (grounded sensors). There is an active shield output to minimize noise pickup in the sensor.

The AD7147 has on-chip calibration logic to compensate for changes in the ambient environment. The calibration sequence is performed automatically and at continuous intervals as long as the sensors are not touched. This ensures that there are no false or nonregistering touches on the external sensors due to a changing environment.

The AD7147 has an SPI-compatible serial interface, and the AD7147-1 has an I2C®-compatible serial interface. Both parts have an interrupt output, as well as a GPIO. There is a VDRIVE pin to set the voltage level for the serial interface independent of VCC.

The AD7147 is available in a 24-lead, 4 mm × 4 mm LFCSP and operates from a 2.6 V to 3.6 V supply. The operating current con-sumption in low power mode is typically 26 μA for 13 sensors.


  • Programmable capacitance-to-digital converter (CDC)Femtofarad resolution13 capacitance sensor inputs9 ms update rate, all 13 sensor inputsNo external RC components requiredAutomatic conversion sequencer
  • On-chip automatic calibration logicAutomatic compensation for environmental changesAutomatic adaptive threshold and sensitivity levels
  • Register map is compatible with the AD7142
  • On-chip RAM to store calibration data
  • SPI-compatible (serial-peripheral-interface-compatible) serial interface (AD7147)
  • I2C-compatible serial interface (AD7147-1)
  • Separate VDRIVE level for serial interface
  • Interrupt output and general-purpose input/output (GPIO)
  • 24-lead, 4 mm × 4 mm LFCSP
  • See datasheet for additional features


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

AD7147 Pinout
(Picture: Pinout)

AD7147 Block Diagram
(Picture: Diagram)

Technical Parameters

Device Primary Function Capacitance to Digital Data Output Interface Serial I2C, Serial SPI
# of Channels 13 Cin Base Offset Rangetyp | F 20p
Resolutionbits 16 Cin Ranges ±8
Sample Ratemax | SPS - Istyp | A 0.9m

AD7147 Documents

  • AD7147 Technical Documentation/Data sheet

AD7147 Related Products

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Analog Devices, Inc. was founded by two MIT graduates, Ray Stata and Matthew Lorber in 1965. The same year, the company released its first product, the model 101 op amp, which was a hockey-puck sized...
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