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AD7143ACPZ-1500RL7 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7143ACPZ-1500RL7 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 56 page Programmable Controller for Capacitance Touch Sensors AD7143 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 25 ms update rate (@ maximum sequence length) Better than 1 fF resolution 8 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 I2C®-compatible serial interface Separate VDRIVE level for serial interface Interrupt output for host controller 16-lead, 4 mm x 4 mm LFCSP-VQ 2.6 V to 3.6 V supply voltage Low operating current Full power mode: less than 1 mA Low power mode: 50 μA APPLICATIONS Personal music and multimedia players Cell phones Digital still cameras Smart hand-held devices Television, A/V, and remote controls Gaming consoles FUNCTIONAL BLOCK DIAGRAM CSHIELD SRC GND CIN0 CIN1 CIN2 CIN3 CIN4 CIN5 CIN6 CIN7 VDRIVE VCC 16-BIT Σ-Δ CDC 15 16 1 2 3 4 5 6 9 10 7 8 250kHz EXCITATION SOURCE CONTROL AND DATA REGISTERS CALIBRA- TION ENGINE CALIBRA- TION RAM POWER-ON RESET LOGIC SDA SCLK INT INTERRUPT LOGIC I2C SERIAL INTERFACE AND CONTROL LOGIC 13 14 12 11 AD7143 Figure 1. GENERAL DESCRIPTION The AD7143 is an integrated capacitance-to-digital converter (CDC) with on-chip environmental calibration for use in systems requiring a novel user input method. The AD7143 interfaces to external capacitance sensors implementing functions, such as capacitive buttons, scroll bars, and scroll wheels. The CDC has eight inputs channeled through a switch matrix to a 16-bit, 250 kHz sigma-delta (∑-Δ) 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, or as a combination of sensor types. By programming the registers, the user has full control over the CDC setup. High resolution sensors require software to run on the host processor. The AD7143 has on-chip calibration logic to account for changes in the ambient environment. The calibration sequence is performed automatically and at continuous intervals, while 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 AD7143 has an I2C-compatible serial interface and a separate VDRIVE pin for I2C serial interface operating voltages between 1.65 V and 3.6 V. The AD7143 is available in a 16-lead, 4 mm × 4 mm LFCSP-VQ and operates from a 2.6 V to 3.6 V supply. The operating current consumption is less than 1 mA, falling to 50 μA in low power mode (conversion interval of 400 ms). |
Podobny numer części - AD7143ACPZ-1500RL7 |
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Podobny opis - AD7143ACPZ-1500RL7 |
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