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AD7147A-1ACBZ-RL Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD7147A-1ACBZ-RL Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 69 page CapTouch Programmable Controller for Single-Electrode Capacitance Sensors AD7147A Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother 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 ©2009 Analog Devices, Inc. All rights reserved. FEATURES Programmable capacitance-to-digital converter (CDC) Femtofarad (fF) 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 AD714x On-chip RAM to store calibration data Serial peripheral interface (SPI) (AD7147A) I2C-compatible serial interface (AD7147A-1) Separate VDRIVE level for serial interface Interrupt output and general-purpose input/output (GPIO) 25-ball, 2.3 mm × 2.1 mm WLCSP 2.6 V to 3.6 V supply voltage Low operating current Full power mode: 1 mA Low power mode: 28.96 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 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. 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 D3 CIN0 A3 CIN1 B3 CIN2 A4 CIN3 C3 CIN4 A5 CIN5 B4 CIN6 B5 CIN7 C4 CIN8 C5 CIN9 D4 CIN10 D5 CIN11 E5 CIN12 VDRIVE GPIO E4 D2 E2 E3 A2 C2 E1 D1 C1 B1 A1 SDO (SDA) SDI (ADD0) SCLK CS (ADD1) INT AD7147A B2 TP NOTES 1. PIN NAMES IN PARENTHESES ARE FOR THE AD7147A-1. Figure 1. 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. |
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