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MFG:ADI D/C:09
Part Number: AD7156
MFG: ADI
D/C: 09
Description: The AD7156 delivers a complete signal processing solution for capacitive sensors, featuring an ultralo...
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AD7156
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DataSheet
General Description
AD7156 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 nvironmental 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 egisters 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.
AD7156 Maximum Ratings
| Parameter | Rating |
| Positive Supply Voltage VDD to GND Voltage on Any Input or Output to GND ESD Rating ESD Association Human Body Model, S5.1 Field-Inducted Charged Device Model Operating Temperature Range Storage Temperature Range Maximum Junction Temperature LFCSP Package JA, Thermal Impedance to Air JC, Thermal Impedance to Case Reflow Soldering (Pb-Free) Peak Temperature Time at Peak Temperature |
−0.3 V to +3.9 V 0.3 V to VDD + 0.3 V 4 kV 500 V −40 to +85 65 to +150 150 49/W 3/W 260(0/−5) 10 sec to 40 sec |
AD7156 Features
Ultralow power
Power supply voltage: 1.8 V to 3.6 V
Operation power supply current: 70 A typical
Power-down current: 2 A typical
Fast response time
Conversion time: 10 ms per channel
Wake-up time from serial interface: 300 s
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)
Power supply voltage: 1.8 V to 3.6 V
Operation power supply current: 70 A typical
Power-down current: 2 A typical
Fast response time
Conversion time: 10 ms per channel
Wake-up time from serial interface: 300 s
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)
AD7156 Typical Application
Buttons and switches
Proximity sensing
Contactless switching
Position detection
Level detection
Portable products
Proximity sensing
Contactless switching
Position detection
Level detection
Portable products
AD7001
PDF/DataSheet Download
- Datasheet: AD7001
- File Size: 634418 KB
- Manufacturer: AD [Analog Devices]
- Click here to Download
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- ·AD7002AS
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- ·AD7008
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