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AD7156BCPZ-REEL Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7156BCPZ-REEL Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 28 page Ultralow Power, 1.8 V, 3 mm × 3 mm, 2-Channel Capacitance Converter AD7156 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesfor itsuse,norfor anyinfringements ofpatents orother 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 ©2008 Analog Devices, Inc. All rights reserved. FEATURES Ultralow power Power supply voltage: 1.8 V to 3.6 V Operation power supply current: 70 μA typical Power-down current: 2 μA typical Fast response time Conversion time: 10 ms per channel Wake-up time from serial interface: 300 μs Adaptive environmental compensation 2 capacitance input channels Sensor capacitance (CSENS): 0 pF up to 13 pF Sensitivity up to 3 fF 2 modes of operation Standalone with fixed settings Interfaced to a microcontroller for user-defined settings 2 detection output flags 2-wire serial interface (I2C-compatible) Operating temperature: −40°C to +85°C 10-lead LFCSP package (3 mm × 3 mm × 0.8 mm) APPLICATIONS Buttons and switches Proximity sensing Contactless switching Position detection Level detection Portable products GENERAL DESCRIPTION The AD7156 delivers a complete signal processing solution for capacitive sensors, featuring an ultralow power converter with fast response time. The AD7156 uses an Analog Devices, Inc., capacitance-to- digital converter (CDC) technology, which combines features important for interfacing to real sensors, such as high input sensitivity and high tolerance of both input parasitic ground capacitance and leakage current. The integrated adaptive threshold algorithm compensates for any variations in the sensor capacitance due to environmental factors like humidity and temperature or due to changes in the dielectric material over time. By default, the AD7156 operates in standalone mode using the fixed power-up settings and indicates detection on two digital outputs. Alternatively, the AD7156 can be interfaced to a micro- controller via the serial interface, the internal registers can be programmed with user-defined settings, and the data and status can be read from the part. The AD7156 operates with a 1.8 V to 3.6 V power supply. It is specified over the temperature range of −40°C to +85°C. FUNCTIONAL BLOCK DIAGRAM DIGITAL FILTER SERIAL INTERFACE CIN1 CSENS1 CSENS2 EXC1 Σ-Δ CDC CIN2 EXC2 MUX EXCITATION THRESHOLD THRESHOLD SCL VDD GND AD7156 SDA OUT1 OUT2 Figure 1. |
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