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AD7156BCPZ-REEL7 PDF预览

AD7156BCPZ-REEL7

更新时间: 2024-11-04 06:36:11
品牌 Logo 应用领域
亚德诺 - ADI 转换器模拟IC信号电路光电二极管
页数 文件大小 规格书
28页 388K
描述
Ultralow Power, 1.8 V, 3 mm × 3 mm, 2-Channel Capacitance Converter

AD7156BCPZ-REEL7 数据手册

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Ultralow Power, 1.8 V, 3 mm × 3 mm,  
2-Channel Capacitance Converter  
AD7156  
FEATURES  
GENERAL DESCRIPTION  
Ultralow power  
The AD7156 delivers a complete signal processing solution for  
capacitive sensors, featuring an ultralow power converter with  
fast response time.  
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  
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.  
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)  
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.  
APPLICATIONS  
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.  
Buttons and switches  
Proximity sensing  
Contactless switching  
Position detection  
Level detection  
Portable products  
FUNCTIONAL BLOCK DIAGRAM  
VDD  
CIN1  
SCL  
SDA  
DIGITAL  
FILTER  
SERIAL  
INTERFACE  
C
C
SENS1  
Σ-Δ CDC  
AD7156  
EXC1  
CIN2  
MUX  
THRESHOLD  
OUT1  
OUT2  
SENS2  
EXCITATION  
EXC2  
THRESHOLD  
GND  
Figure 1.  
Rev. 0  
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 registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2008 Analog Devices, Inc. All rights reserved.  
 
 

AD7156BCPZ-REEL7 替代型号

型号 品牌 替代类型 描述 数据表
AD7156BCPZ-REEL ADI

完全替代

Ultralow Power, 1.8 V, 3 mm × 3 mm, 2-Channel

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