AD7156BCPZ-REEL7

AD7156 is an ultralow power, 1.8V, 3 mm × 3 mm, 2-channel capacitance converter. It delivers complete signal processing solution for capacitive sensor, featuring an ultralow power converter with fast response time. This 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. Applications include buttons and switches, proximity sensing, contactless switching, position detection, level detection, portable products.

• Ultralow power, 1.8V to 3.6V power supply voltage range
• 70μA typical operation power supply current, 2μA typical power-down current
• Fast response time, 20ms maximum conversion time (VDD = 1.8V to 3.6V, -40°C to +85°C)
• 300μs wake-up time from serial interface
• Adaptive environmental compensation, 2 capacitance input channels
• 0pF up to 13pF sensor capacitance range, sensitivity up to 3fF
• 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)
• 10 lead LFCSP-WD package, operating temperature range from -40°C to +85°C

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