AD7156
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AD7156

Ultralow Power, 1.8 V, 3 mm × 3 mm, 2-Channel Capacitance Converter

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1ku List Price Starting From $1.66
Features
  • 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)
Additional Details
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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
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Part Models 2
1ku List Price Starting From $1.66
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AD7156

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Data Sheet

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UPDATED 11/04/2008
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AD7156: Ultralow Power, 1.8 V, 3 mm × 3 mm, 2-Channel Capacitance Converter Data Sheet (Rev.0)

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Evaluation Design File

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UPDATED 06/10/2009
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EVAL-AD7156EBZ: Evaluation Kit for AD7156 Ultralow Power Capacitance Converter redirect icon

843 kB

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Application Note

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UPDATED 11/01/2009
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AN-1048: AD7150 On-Chip Noise Filter redirect icon

Frequently Asked Question

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UPDATED 03/20/2018
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Documentation

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. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
AD7156BCPZ-REEL 10-Lead LFCSP (3mm x 3mm) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
AD7156BCPZ-REEL7 10-Lead LFCSP (3mm x 3mm) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

Evaluation Kits 2

EVAL-AD7156

AD7156 Evaluation Board

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EVAL-AD7156

AD7156 Evaluation Board

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EVAL-AD7156
AD7156 Evaluation Board
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Product Detail

The EVAL-AD7156EBZ is a fully featured evaluation board for the AD7156. The evaluation board can be operated in complete standalone, battery-powered mode or connected to a PC via a standard USB interface. When operated with a PC, software is provided enabling the user to perform detailed analysis of the CDC's performance. This software includes the technical note describing the operation and set up of the evaluation board.


Resources

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URL

AD7150 IIO Capacitance to Digital Converter GitHub Linux Driver Source Code reference design link

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EVAL-AD7156EBZ: Evaluation Kit for AD7156 Ultralow Power Capacitance Converter Download

843 kB

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Software

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AD7156 Evaluation Software Download

290452 kB

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EVAL-HCRWATCH4Z

Vital Signs Monitoring (VSM) Watch

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EVAL-HCRWATCH4Z

Vital Signs Monitoring (VSM) Watch

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EVAL-HCRWATCH4Z
Vital Signs Monitoring (VSM) Watch

Features and Benefits

  • Vital signs monitoring platform
  • Wearable battery powered platform
  • Real-time live data view
  • Data storage to flash memory for offline analyses
  • Easy configuration
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Product Detail

The vital signs monitoring (VSM) watch, EVAL-HCRWATCH4Z, is a modular development, demonstration, and data collection platform for high performance vital signs monitoring applications based on Analog Devices, Inc., analog front ends (AFEs) and sensors.

The VSM watch is a wearable, battery-powered device that enables the continuous monitoring and on-demand spot check measurement of photoplethysmography (PPG), electrodermal activity (EDA, bioimpedance-based), skin temperature, electrocardiography (ECG, biopotential based), and motion/activity (based on a 3‑axis accelerometer).

The VSM watch allows synchronized, multiparameter data storage on internal memory for later data retrieval and offline analysis and/or live monitoring on a PC (Windows® OS) or Android- or iOS-based device.

Resources

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UG-1221: Vital Signs Monitoring (VSM) Watch (Rev.0) Download

2.54 M

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Android SDK reference design link

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Python SDK reference design link

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Software

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ADI Study Watch (iOS) reference design link

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ADI Study Watch (Android) Download

25.52 M

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Wavetool Evaluation Software Download

64.99 M

Evaluation Kits2

EVAL-AD7156

AD7156 Evaluation Board
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EVAL-HCRWATCH4Z

Vital Signs Monitoring (VSM) Watch

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