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AD7147ACPZ-1REEL Datenblatt(PDF) 1 Page - Analog Devices |
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AD7147ACPZ-1REEL Datenblatt(HTML) 1 Page - Analog Devices |
1 / 68 page CapTouch™ Programmable Controller for Single-Electrode Capacitance Sensors AD7147 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. 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. FEATURES 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 2.6 V to 3.3 V supply voltage Low operating current Full power mode: 1 mA Low power mode: 21.5 μA APPLICATIONS Cell phones Personal music and multimedia players Smart handheld devices Television, A/V, and remote controls Gaming consoles Digital still cameras GENERAL DESCRIPTION The AD7147 is designed for use with capacitance sensors implementing functions such as buttons, scroll bars, and wheels. The sensors need only one PCB layer, enabling ultra thin 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 (∑-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. FUNCTIONAL BLOCK DIAGRAM CALIBRATION ENGINE SERIAL INTERFACE AND CONTROL LOGIC CALIBRATION RAM POWER-ON RESET LOGIC INTERRUPT AND GPIO LOGIC EXCITATION SOURCE ACSHIELD VCC GND BIAS CONTROL AND DATA REGISTERS 16-BIT Σ-Δ CDC 19 CIN0 20 CIN1 21 CIN2 22 CIN3 23 CIN4 24 CIN5 1 CIN6 2 CIN7 3 CIN8 4 CIN9 5 CIN10 6 CIN11 7 CIN12 VDRIVE GPIO 8 11 10 9 18 12 13 14 15 16 17 SDO/ SDA SDI/ ADD0 SCLK CS/ ADD1 INT AD7147 Figure 1. AD7147 Block Diagram 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. |
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