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.
●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
