Optical sensor with logic for gesture recognition
The ADUX1020 has an integrated 14-bit analog-to-digital converter (ADC) and a 20-bit burst accumulator that works in concert with a flexible light emitting diode (LED) driver. It is designed to modulate a LED and measure the corresponding optical return signal. The digital engine includes circuitry and control for data aggregation and proximity detection.
The data output and device configuration use a 1.8V I2C interface.
The control circuitry includes flexible LED pulse width and period generation combined with synchronous detection. This circuitry is complemented by a low noise, low power, and wide dynamic range configurable analog front end (AFE), clock generation, LED driver, and digital logic for position and smart sample mode (event driven x, y coordinates, relative z data). This complete AFE features ambient light rejection, avoiding corruption due to external interference.
One standard surface mount, broad angle or narrow-angle IR LED (depending upon application) is required. This LED mounts externally to the ADUX1020.
Packaged in a 2mm by 3mm, 8-lead LFCSP, the ADUX1020 is specified over an operating temperature range of −40°C to +85°C.
The chip is priced at $3.49 per unit in 1,000 unit quantities and is available in volume.
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