Add to Signal Chain Designer

AD7147:  CapTouch™ Programmable Controller for Single-Electrode Capacitance Sensors

Product Details


The AD7147 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 AD7147 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.

The AD7147 is designed for single electrode capacitance sensors (grounded sensors). There is an active shield output to minimize noise pickup in the sensor.

The AD7147 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 AD7147 has an SPI-compatible serial interface, and the AD7147-1 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 AD7147 is available in a 24-lead, 4 mm × 4 mm LFCSP and operates from a 2.6 V to 3.6 V supply. The operating current con-sumption in low power mode is typically 26 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)
    - Femtofarad resolution
    - 13 capacitance sensor inputs
    - 9 ms update rate, all 13 sensor inputs
    - No external RC components required
    - Automatic conversion sequencer
  • On-chip automatic calibration logic
    - Automatic compensation for environmental changes
    - Automatic adaptive threshold and sensitivity levels
  • Register map is compatible with the AD7142
  • On-chip RAM to store calibration data
  • SPI-compatible (serial-peripheral-interface-compatible) serial interface (AD7147)
  • I2C-compatible serial interface (AD7147-1)
  • Separate VDRIVE level for serial interface
  • Interrupt output and general-purpose input/output (GPIO)
  • 24-lead, 4 mm × 4 mm LFCSP
  • See datasheet for additional features

Block Diagram for AD7147

OF NOTE ...

Documentation

Title Content Type File Type
AD7147: CapTouch Programmable Controller for Single-Electrode Capacitance Sensors Data Sheet (Rev D, 09/2011) (pdf, 1397 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
AD7147: Higher Touch-Control Sensitivity From Capacitance-to-Digital Converter
(acquisitionZONE, 7/30/2007)
Product Reviews HTML
CDC Enables Touch-Control Sensitivity in Portable Electronic Devices
(Embedded.com, 6/11/2007)
Product Reviews HTML
Healthcare ICs
Healthcare ICs Solutions Bulletin, Volume 11, Issue 2
Solutions Bulletins HTML
2008 Medical Solution Profile  (pdf, 126 kB)
High Performance ICs for Medical Imaging, Patient Monitoring, and Instrumentation
Overview PDF
We measure portable performance in µA and MHz. In handheld designs, analog is everywhere. Overview HTML
ICs for Enhanced Handset User Experience Overview HTML
Capacitance-to-Digital Converter (CDC) Technology Overview HTML
Leading Inside Advertorials: Providing an Edge in Capacitive Sensor Applications  (pdf, 85 kB) 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
Can other components go on same PCB as sensor? 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

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

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

AD7147 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7147ACPZ-1500RL7 Status: Production 24 ld LFCSP (4x4mm 2.5mm PAD) 24 Ind Reel, 500 - $1.28 Y  Material Info PCN Purchase Sample
AD7147ACPZ-1REEL Status: Production 24 ld LFCSP (4x4mm 2.5mm PAD) 24 Ind Reel, 5000 - $1.28 Y  Material Info Notify Me Purchase
AD7147ACPZ-500RL7 Status: Production 24 ld LFCSP (4x4mm 2.5mm PAD) 24 Ind Reel, 500 - $1.28 Y  Material Info PCN Purchase Sample
AD7147ACPZ-REEL Status: Production 24 ld LFCSP (4x4mm 2.5mm PAD) 24 Ind Reel, 5000 - $1.28 Y  Material Info Notify Me Purchase
AD7147PACPZ-1500R7 Status: Production 24 ld LFCSP (4x4mm 2.5mm PAD) 24 Ind Reel, 500 - $1.28 Y  Material Info PCN Purchase Sample
AD7147WPACPZ-1500R Status: Production 24 ld LFCSP (4x4mm 2.5mm PAD) 24 Ind Reel, 500 - $1.38 Y  Material Info Notify Me Purchase
AD7147WPACPZ-1RL Status: Production 24 ld LFCSP (4x4mm w/2.30mm EP) 24 Ind Reel, 5000 - $1.38 Y  Material Info Notify Me Purchase
AD7147WPACPZ-500R7 Status: Production 24 ld LFCSP (4x4mm w/2.30mm EP) 24 Ind Reel, 500 - $1.38 Y  Material Info Notify Me Purchase
AD7147WPACPZ-RL Status: Production 24 ld LFCSP (4x4mm w/2.30mm EP) 24 Ind Reel, 5000 - $1.38 Y  Material Info Notify Me 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.

EVAL-AD7147 & EVAL-AD7147-1 Evaluation Boards
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7147EBZ Status: Production Evaluation Board $177.10 Yes -
EVAL-AD7147-1EBZ Status: Production AD7147 Evaluation Board – I2C version $177.10 Yes -

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.

Check Inventory & Purchase

View Sales and Distribution Offices

沪ICP备09046653号
content here.
content here.

Review this Product

Close