Details, datasheet, quote on part number: AD7142ACPZ-1500RL7
PartAD7142ACPZ-1500RL7
Category
Title16 b
Description
CompanyAnalog Devices
DatasheetDownload AD7142ACPZ-1500RL7 datasheet
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AD7142ACPZ-1500RL7 photo

Others parts numbering
AD7142ACPZ-1REEL
AD7142ACPZ-500RL7
AD7147A-1ACBZ500R7
AD7147AACBZ-500RL7
AD7147ACPZ-1500RL7
AD7147ACPZ-500RL7
AD7147PACPZ-1500R7
AD7147PACPZ-500R7
AD7147WPACPZ-1500R
AD7147WPACPZ-500R7
AD7152BRMZ: 12 b
AD7153BRMZ
AD7156BCPZ-REEL7
AD7745ARUZ: 24 b
AD7746ARUZ
AD7747ARUZ

 

Features, Applications

FEATURES

Programmable capacitance-to-digital converter 36 ms update rate maximum sequence length) Better than 1 fF resolution 14 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 SPI-compatible serial interface (AD7142) I2C-compatible serial interface (AD7142-1) Separate VDRIVE level for serial interface Interrupt output and GPIO 5 mm LFCSP_VQ 3.6 V supply voltage Low operating current Full power mode: less than 1 mA Low power mode: 50 A

APPLICATIONS

Personal music and multimedia players Cell phones Digital still cameras Smart hand-held devices Television, A/V, and remote controls Gaming consoles

The AD7142 and AD7142-1 are integrated capacitance-todigital converters (CDCs) with on-chip environmental calibration for use in systems requiring a novel user input method. The AD7142 and AD7142-1 can interface to external capacitance sensors implementing functions such as capacitive buttons, scroll bars, or wheels. The CDC has 14 inputs channeled through a switch matrix 16-bit, 250 kHz sigma-delta 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, as a combination of sensor types. 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.

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

The AD7142 and AD7142-1 have on-chip calibration logic to account for changes in the ambient environment. The calibration sequence is performed automatically and at continuous intervals, when 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 AD7142 has an SPI-compatible serial interface, and the AD7142-1 has an I2C-compatible serial interface. Both parts have an interrupt output, as well as a general-purpose input/ output (GPIO). The AD7142 and AD7142-1 are available 5 mm LFCSP_VQ and operate from 3.6 V supply. The operating current consumption is less than 1 mA, falling A in low power mode (conversion interval of 400 ms).

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 2007 Analog Devices, Inc. All rights reserved.

This product is not recommended for new designs. The AD7147 is recommended instead for new CapTouch(R) designs.

AD714X Input CapTouch(R) Programmable Controller Linux Driver

AN-854: Sensor PCB Design Guidelines for the AD7142 and AD7143 Capacitance-to-Digital Converters Applications AN-929: Tuning the AD714x for CapTouch(R) AN-857: Introduction to AD7142 Host Software Requirements AN-858: AD7142 Sensor Board In-Line Production Test Procedure AN-830: Factors Affecting Sensor Response AN-829: Environmental Compensation on the AD7142: The Effects of Temperature and Humidity on Capacitance Sensors Webcast: Design And Develop Innovative And Robust Touch Sensor Interfaces Using Capacitive-To-Digital Converters Capacitance Sensors for Human Interfaces to Electronic Equipment MS-2210: Designing Power Supplies for High Speed ADC Capacitive Sensors Can Replace Mechanical Switches for Touch Control Programmable Medical Infusion Pumps Offer High Reliability and Performance Building a reliable capacitive-sensor interface EE Times Names ACE Finalists Programmable 16-Bit CDC Targets Handheld Touch Screen Apps Programmable Capacitance-to-Digital Converter Includes 14 Channels Capacitance-To-Digital Converter Eases Touch-Based Switch Implementation Capacitance-To-Digital Converter Simplifies Touchpad Design ADI's Capacitance-To-Digital Converter analogZONE Reviews The AD7142 CDC Capacitive Touch Sensors Gain Fans iPod's Lesson: Please Touch Capacitive Touch Sensors Fulfill Early Promise Motion Sensing Devices Make Integrated Systems Easy Visit the AD7142 Product Page for more documentation.

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* This page was dynamically generated by Analog Devices, Inc. and inserted into this data sheet. Note: Dynamic changes to the content on this page (labeled 'Important Links') does not constitute a change to the revision number of the product data sheet. This content may be frequently modified.

Features.............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram.............................................................. 1 General Description......................................................................... 1 Revision History............................................................................... 3 Specifications..................................................................................... 4 SPI Timing Specifications I C Timing Specifications (AD7142-1)..................................... 7 Absolute Maximum Ratings............................................................ 8 ESD Caution.................................................................................. 8 Pin Configurations and Function Descriptions........................... 9 Typical Performance Characteristics........................................... 10 Theory of Operation...................................................................... 12 Capacitance Sensing Theory..................................................... 12 Operating Modes........................................................................ 13 Capacitance Sensor Input Configuration.................................... 14 CIN Input Multiplexer Setup.................................................... 14 Capacitance-to-Digital Converter................................................ 15 Oversampling the CDC Output............................................... 15 Capacitance Sensor Offset Control.......................................... 15 Conversion Sequencer............................................................... 15 CDC Conversion Sequence Time............................................ 16 CDC Conversion Results........................................................... 17 Noncontact Proximity Detection................................................. 18 Recalibration............................................................................... 18 Proximity Sensitivity.................................................................. 18 FF_SKIP_CNT............................................................................ 20 Environmental Calibration........................................................... 22 Capacitance Sensor Behavior Without Calibration............... 22

Capacitance Sensor Behavior with Calibration...................... 22 SLOW FIFO................................................................................ 23 SLOW_FILTER_UPDATE_LVL.............................................. 23 Adaptive Threshold and Sensitivity............................................. 24 Interrupt Output............................................................................. 26 CDC Conversion Complete Interrupt..................................... 26 Sensor Touch Interrupt.............................................................. 26 GPIO INT Output Control....................................................... 28 Outputs............................................................................................ 30 Excitation Source........................................................................ 30 CSHIELD Output............................................................................. 30 GPIO............................................................................................ 30 Using the GPIO to turn on/off an LED................................... 30 Serial Interface................................................................................ 31 SPI Interface................................................................................ 31 I2C Compatible Interface........................................................... 33 VDRIVE Input................................................................................. 35 PCB Design Guidelines................................................................. 36 Capacitive Sensor Board Mechanical Specifications............. 36 Chip Scale Packages................................................................... 36 Power-Up Sequence....................................................................... 37 Typical Application Circuits......................................................... 38 Register Map................................................................................... 39 Detailed Register Descriptions..................................................... 40 Bank 1 Registers......................................................................... 40 Bank 2 Registers......................................................................... 50 Bank 3 Registers......................................................................... 57 Outline Dimensions....................................................................... 69 Ordering Guide.......................................................................... 69


 

Some Part number from the same manufacture Analog Devices
AD7142ACPZ-1REEL
AD7142ACPZ-500RL7
AD7147A-1ACBZ500R7
AD7147AACBZ-500RL7
AD7147ACPZ-1500RL7
AD7147ACPZ-500RL7
AD7147PACPZ-1500R7
AD7147PACPZ-500R7
AD7147WPACPZ-1500R
AD7147WPACPZ-500R7
AD7152BRMZ
AD7153BRMZ
AD7156BCPZ-REEL7
AD7745ARUZ
AD7746ARUZ
AD7747ARUZ
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