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AD7147A:  CapTouch® Programmable Controller for Single-Electrode Capacitance Sensors

The AD7147A CapTouch® controller is designed for use with capacitance sensors implementing functions such as buttons, scroll bars, and wheels. The sensors need only one PCB layer, enabling ultrathin applications.

The AD7147A 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) ...More

AD7147A:  CapTouch® Programmable Controller for Single-Electrode Capacitance Sensors

Product Description

The AD7147A CapTouch® controller is designed for use with capacitance sensors implementing functions such as buttons, scroll bars, and wheels. The sensors need only one PCB layer, enabling ultrathin applications.

The AD7147A 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 and may require two PCB layers.

The AD7147A is designed for single electrode capacitance sensors (grounded sensors). There is an active shield output to minimize noise pickup in the sensor.

The AD7147A 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 AD7147A has an SPI-compatible serial interface, and the AD7147A-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 AD7147A is available in a 25-ball, 2.3 mm × 2.1 mm WLCSP and operates from a 2.6 V to 3.6 V supply. The operating current consumption in low power mode is typically 28 μA for 13 sensors.

Applications

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

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EVALUATION BOARDS & DEVELOPMENT KITS

  • Programmable capacitance-to-digital converter (CDC) - Please see data sheet for additional information.
  • On-chip automatic calibration logic
    Automatic compensation for environmental changes
    Automatic adaptive threshold and sensitivity levels
  • Register map is compatible with the AD714x
  • On-chip RAM to store calibration data
  • SPI-compatible (serial-peripheral-interface-compatible) interface (AD7147A)
  • I2C-compatible serial interface (AD7147A-1)
  • Separate VDRIVE level for serial interface
  • 25-ball, 2.3 mm × 2.1 mm WLCSP
  • Low latency from touch to response
  • Resolution (Bits): 16bit
  • T-Put Rate: 250kSPS
  • # Chan: 13
  • Supply V: (+3.3Anlg,+1.6 to 3.6Dig),(+3Anlg, +1.6 to 3.6Dig),Single(+2.7 to +5.25)
  • Pwr Diss: 6.5mW
  • Sleep Pwr Diss: 36µW
  • Ain Range: ± 8 pF (Delta C)
  • Ref Int/Ext: Int
  • Product Description: CapTouch® Programmable Controller for Single-Electrode Capacitance Sensors

Functional Block Diagram for AD7147A

OF NOTE ...

Demo

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Part# Resolution (Bits) T-Put Rate # Chan Supply V Pwr Diss Input Base C (pF Max) Cin Range (pF) Pkg Type Price* (1000-4999) Product Description Interface
AD7142 16 27.8SPS 14 Single(+2.6 to +3.6), Single(+2.7), Single(+3), Single(+3.3) 3.6mW 20 ±2 CSP $1.37 CAPTouch (TM) Programmable Controller for 2-Electrode Capacitance Sensor with SPI or I2C Interface I²C/Ser 2-Wire, Ser, SPI
AD7143 16 43.5SPS 8 Single(+2.6 to +3.6) 3.6mW 20 ±2 CSP $1.25 CAPTouch (TM) Programmable Controller for 2-Electrode Capacitance Sensor with I2C Interface I²C/Ser 2-Wire, Ser
AD7147 16 111SPS 13 Single(+3), Single(+3.3) 3.6mW 20 ±8 CSP $1.28 CAPTouch (TM) Programmable Controller w/ SPI or I2C Interface for Single-Electrode Cap Sensors I²C/Ser 2-Wire, Ser, SPI
AD7147A 16 250kSPS 13 (+3.3Anlg,+1.6 to 3.6Dig), (+3Anlg, +1.6 to 3.6Dig), Single(+2.7 to +5.25) 6.5mW 20 ±8 CSP $1.25 CapTouch® Programmable Controller for Single-Electrode Capacitance Sensors I²C/Ser 2-Wire, Ser, SPI
AD7148 16 4SPS 8 Multi(+3.3Anlg, +3.3Dig) 3.3mW 20 ±8 CSP $1.21 Octal Input, Programmable-Touch Controller for Single Electrode Capacitance Sensors I²C/Ser 2-Wire, Ser
AD7150 12 100SPS 2 Single(+2.7 to +3.6) 0.43mW 10 ±4 SOP $1.37 Ultra-Lo Pwr, 2-Ch Capacitance Converter for Proximity Sensing Applications I²C/Ser 2-Wire, Ser
AD7151 12 100SPS 1 Single(+2.7 to +3.6) 0.3mW 10 ±4 SOP $1.37 Ultra-Low Power, 1-Ch, Capacitance Converter for Proximity Sensing Applications I²C/Ser 2-Wire, Ser
AD7152 12 200SPS 2 Single(+2.7 to +3.6) 432µW 50 ±0.25 SOP $1.97 12-Bit Capacitance-to-Digital Converter (2 Capacitance Input Channels) I²C/Ser 2-Wire, Ser
AD7153 12 200SPS 1 Single(+2.7 to +3.6) 432µW 50 ±0.25 SOP $1.77 12-Bit Capacitance-to-Digital Converter I²C/Ser 2-Wire, Ser
AD7156 12 100SPS 2 Single(+1.8), Single(+2.5), Single(+2.7), Single(+3), Single(+3.3), Single(+3.6) 306µW 50 ±0.5 CSP $1.25 Ultralow Power, 1.8 V, 3 mm × 3 mm, 2-Channel Capacitance Converter I²C/Ser 2-Wire, Ser
AD7745 24 90SPS 1 Single(+2.7 to +5.25) 4.25mW 17 ±4 SOP $4.66 24-Bit, Cap-to-Dig Conv. w/ 1 SE/Diff Capacitive Input Ch for Interface to Dual Electrode Cap Sensor I²C/Ser 2-Wire, Ser
AD7746 24 90SPS 2 Single(+2.7 to +5.25) 4.25mW 17 ±4 SOP $5.01 24-bit, Cap-to-Dig Conv. w/ 2 SE/Diff Capacitive Input Ch for interface to Dual Electrode Cap Sensor I²C/Ser 2-Wire, Ser
AD7747 24 45.5SPS 1 Single(+2.7 to +5.25) 4.25mW 17 ±8 SOP $4.66 24-bit, Cap-to-Dig Conv w/1 SE/Diff Capacitive Input Ch for interface to Single Electrode Cap Sensor I²C/Ser 2-Wire, Ser
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*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.