Overview

Features and Benefits

  • Ultralow power
    Power supply voltage: 1.8 V to 3.6 V
    Operation power supply current: 70 μA typical
    Power-down current: 2 μA typical
  • Fast response time
    Conversion time: 10 ms per channel
    Wake-up time from serial interface: 300 μs
  • Adaptive environmental compensation
  • 2 capacitance input channels
    Sensor capacitance (CSENS): 0 pF up to 13 pF
    Sensitivity up to 3 fF
  • 2 modes of operation
    Standalone with fixed settings
    Interfaced to a microcontroller for user-defined settings
  • 2 detection output flags
  • 2-wire serial interface (I2C-compatible)
  • Operating temperature: −40°C to +85°C
  • 10-lead LFCSP package (3 mm × 3 mm × 0.8 mm)

Product Details

The AD7156 delivers a complete signal processing solution for capacitive sensors, featuring an ultralow power converter with fast response time.

The AD7156 uses an Analog Devices, Inc., capacitance-to-digital converter (CDC) technology, which combines features important for interfacing to real sensors, such as high input sensitivity and high tolerance of both input parasitic ground capacitance and leakage current.

The integrated adaptive threshold algorithm compensates for any variations in the sensor capacitance due to environmental factors like humidity and temperature or due to changes in the dielectric material over time.

By default, the AD7156 operates in standalone mode using the fixed power-up settings and indicates detection on two digital outputs. Alternatively, the AD7156 can be interfaced to a micro-controller via the serial interface, the internal registers can be programmed with user-defined settings, and the data and status can be read from the part.

The AD7156 operates with a 1.8 V to 3.6 V power supply. It is specified over the temperature range of −40°C to +85°C.

Applications

  • Buttons and switches
  • Proximity sensing
  • Contactless switching
  • Position detection
  • Level detection
  • Portable products

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

Discussions

AD7156 Discussions

Eval AD7156 integrating with arduino uno
16 week(s) ago in Speed DACs
Re: AD7156 x AD7147
16 week(s) ago in Precision ADCs
AD7156 x AD7147
16 week(s) ago in Precision ADCs
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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.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.