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

Product Details


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 environmen-tal 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 28.96 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

FEATURES and BENEFITS

  • 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

Functional Block Diagram for AD7147A

OF NOTE ...

Documentation

Title Content Type File Type
AD7147A: CapTouch Programmable Controller for Single-Electrode Capacitance Sensors Data Sheet (Rev B, 12/2009) (pdf, 1352 kB) Data Sheets PDF
AN-925: Sensors for the AD7147 and AD7148 CapTouch® Controllers  (pdf, 189 kB) Application Notes PDF
AN-957: Layout Guidelines for the AD7147 and AD7148 CapTouch® Controllers  (pdf, 337 kB) Application Notes PDF
AN-929: Tuning the AD714x for CapTouch® Applications  (pdf, 618 kB) Application Notes PDF
Webcast: Design And Develop Innovative And Robust Touch Sensor Interfaces Using Capacitive-To-Digital Converters
This Webcast will focus on the design and development of CDC-based touch sensors and their application, cite CDC product examples such as the AD7142, and explore development tools provided by ADI.
Webcasts WEBCAST
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
2008 Medical Solution Profile  (pdf, 126 kB)
High Performance ICs for Medical Imaging, Patient Monitoring, and Instrumentation
Overview PDF
Is an air gap between sensor PCB and covering material allowed? FAQs/RAQs HTML
When should I use AC shield? FAQs/RAQs HTML
2-layer or 4-layer PCB? FAQs/RAQs HTML
Is there a keep out area required around the sensor? FAQs/RAQs HTML
What is the maximum distance between sensor traces and AD7147? FAQs/RAQs HTML
How many sensors can I implement using one AD7147 device? FAQs/RAQs HTML
Can all sensors connected to the AD7147 be active at the same time? FAQs/RAQs HTML
What happens when a finger is placed across two sensor buttons? FAQs/RAQs HTML
What happens when users with different finger sizes contact the sensor? FAQs/RAQs HTML
Will the AD714x sensors work with a glove? FAQs/RAQs HTML
Can conductive material be placed directly on top of the sensors? FAQs/RAQs HTML
Can the AD714x work under wet/humid conditions? FAQs/RAQs HTML
How far away from the sensor can proximity be detected? FAQs/RAQs HTML
Is there a power-up configuration? FAQs/RAQs HTML
Is auto calibration possible? FAQs/RAQs HTML
What is the IC temperature range? FAQs/RAQs HTML
What is the AD714x operating voltage range? FAQs/RAQs HTML
Does the AD714x have an interrupt? FAQs/RAQs HTML
Should I be concerned about ESD? FAQs/RAQs HTML
Is there software required for buttons? FAQs/RAQs HTML
Does Analog Devices provide the open source C-Code for sliders and scroll wheels? FAQs/RAQs HTML
What is the code space for a Slider? FAQs/RAQs HTML
What is the code space for a Scroll Wheel? FAQs/RAQs HTML
Is an air gap between sensor PCB and covering material allowed? FAQs/RAQs HTML
Which iCoupler product is best for my application? FAQs/RAQs HTML
What are Capacitive Sensors and how are they used? FAQs/RAQs HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD714X Input CapTouch® Programmable Controller Linux Driver Device Drivers HTML
CapTouch Software License Agreement  (pdf, 15 kB)
Dowloading and opening the software implies acceptance of the Analog Devices software license agreement
Software Modules PDF

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD7147A Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7147A-1ACBZ-RL Status: Production 25 Ball WLCSP (2.25X2.05) 25 Ind Reel, 10000 - $1.28 Y  Material Info PCN/PDN Purchase Sample
AD7147A-1ACBZ500R7 Status: Contact ADI 25 Ball WLCSP (2.25X2.05) 25 Ind Reel, 500 - $1.28 Y  Material Info PCN/PDN Purchase
AD7147AACBZ-500RL7 Status: Production 25 Ball WLCSP (2.25X2.05) 25 Ind Reel, 500 - $1.25 Y  Material Info PCN/PDN Purchase Sample
AD7147AACBZ-RL Status: Production 25 Ball WLCSP (2.25X2.05) 25 Ind Reel, 10000 - $1.25 Y  Material Info PCN/PDN Purchase
Price Table Help

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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