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Analog Devices - Capacitance Converter

Numéro de référence AD7150
Description Capacitance Converter
Fabricant Analog Devices 
Logo Analog Devices 





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AD7150 fiche technique
Ultra-Low Power, 2-Channel, Capacitance
Converter for Proximity Sensing
AD7150
FEATURES
Ultra-low power
2.7 V to 3.6 V, 100 μA
Response time: 10 ms
Adaptive environmental compensation
2 independent capacitance input channels
Sensor capacitance (CSENS) 0 pF up to 13 pF
Sensitivity to 1 fF
EMC tested
2 modes of operation
Standalone with fixed settings
Interfaced to a microcontroller for user-defined settings
2 proximity detection output flags
2-wire serial interface (I2C compatible)
Operating temperature
−40°C to +85°C
10-lead MSOP package
APPLICATIONS
Proximity sensing
Contactless switching
Position detection
Level detection
GENERAL DESCRIPTION
The AD7150 delivers a complete signal processing solution for
capacitive proximity sensors, featuring an ultra-low power
converter with fast response time. The AD7151 is a single-
channel, lower power alternative to the AD7150.
The AD7150 uses 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 AD7150 operates in standalone mode using the
fixed power-up settings and indicates detection on two digital
outputs. Alternatively, the AD7150 can be interfaced to a
microcontroller 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 AD7150 operates with a 2.7 V to 3.6 V power supply. It is
specified over the temperature range of −40°C to +85°C.
CSENS1
CSENS2
CIN1
EXC1
CIN2
EXC2
FUNCTIONAL BLOCK DIAGRAM
VDD
Σ-Δ CDC
MUX AD7150
DIGITAL
FILTER
THRESHOLD
SERIAL
INTERFACE
EXCITATION
THRESHOLD
GND
Figure 1.
SCL
SDA
OUT1
OUT2
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.
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.

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