AD7143
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AD7143

Programmable Controller for Capacitance Touch Sensors

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Part Details
Part Models 1
1ku List Price
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Features
  • Programmable capacitance-to-digital converter
    25 ms update rate (@ maximum sequence length)
    Better than 1 fF resolution
    8 capacitance sensor input channels
    No external RC tuning components required
    Automatic conversion sequencer
  • On-chip automatic calibration logic
    Automatic compensation for environmental changes
    Automatic adaptive threshold and sensitivity levels
  • On-chip RAM to store calibration data
  • I2C®-compatible serial interface
  • Separate VDRIVE level for serial interface
  • Interrupt output for host controller
  • 16-lead, 4 mm x 4 mm LFCSP-VQ
  • 2.6 V to 3.6 V supply voltage
  • Low operating current
    Full power mode: less than 1 mA
    Low power mode: 50 µA
Additional Details
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The AD7143 is an integrated capacitance-to-digital converter (CDC) with on-chip environmental calibration for use in systems requiring a novel user input method. The AD7143 interfaces to external capacitance sensors implementing functions, such as capacitive buttons, scroll bars, and scroll wheels.

The CDC has eight inputs channeled through a switch matrix to a 16-bit, 250 kHz sigma-delta (Σ-Δ) capacitance-to-digital converter. The CDC is capable of sensing changes in the capacitance of the external sensors and uses this information to register a sensor activation. The external sensors can be arranged as a series of buttons, as a scroll bar or wheel, or as a combination of sensor types. By programming the registers, the user has full control over the CDC setup. High resolution sensors require software to run on the host processor.

The AD7143 has on-chip calibration logic to account for changes in the ambient environment. The calibration sequence is performed automatically and at continuous intervals, while the sensors are not touched. This ensures that there are no false or non-registering touches on the external sensors due to a changing environment.

The AD7143 has an I2C-compatible serial interface and a separate VDRIVE pin for I2 serial interface operating voltages between 1.65 V and 3.6 V.

The AD7143 is available in a 16-lead, 4 mm x 4 mm LFCSP-VQ and operates from a 2.6 V to 3.6 V supply. The operating current consumption is less than 1 mA, falling to 50 μA in low power mode (conversion interval of 400 ms).

APPLICATIONS

  • Personal music and multimedia players
  • Cell phones
  • Digital still cameras
  • Smart hand-held devices
  • Television, A/V, and remote controls
  • Gaming consoles
Part Models 1
1ku List Price
price unavailable

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
AD7143ACPZ-1500RL7
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Part Models

Product Lifecycle

PCN

May 5, 2014

- 14_0020

Conversion of 4x4mm body Size LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines.

Feb 15, 2010

- 07_0061

LFCSP Package Manufacturing Line Transfer from Amkor Korea to Amkor PRC

Oct 26, 2009

- 09_0202

Inclusion of Banding Tape for LFCSP REEL7 parts.

Dec 16, 2014

- 14_0094

Obsolescence of certain AD7143, AD7147A, AD7148, ADUX1001 & AD7889 models.

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

May 5, 2014

- 14_0020

arrow down

Conversion of 4x4mm body Size LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines.

Feb 15, 2010

- 07_0061

arrow down

LFCSP Package Manufacturing Line Transfer from Amkor Korea to Amkor PRC

Oct 26, 2009

- 09_0202

arrow down

Inclusion of Banding Tape for LFCSP REEL7 parts.

Dec 16, 2014

- 14_0094

arrow down

Obsolescence of certain AD7143, AD7147A, AD7148, ADUX1001 & AD7889 models.

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