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| 型号： | AD7156BCPZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC CDC 2CH 12BIT 1.8V 10-LFCSP |
| 标准包装： | 5,000 |
| 类型： | 电容数字转换器 |
| 分辨率（位）： | 12 b |
| 采样率（每秒）： | 100k |
| 数据接口： | 串行 |
| 电压电源： | 单电源 |
| 电源电压： | 1.8 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘，CSP |
| 供应商设备封装： | 10-LFCSP-WD（3x3） |
| 包装： | 带卷 (TR) |
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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
SCL
VDD
GND
AD7156
SDA
OUT1
OUT2
0
77
26
-0
01
Figure 1.
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