Ambient light and proximity sensor

22 February 2012 Opto-Electronics

Maxim’s new MAX44000 is a digital ambient light and infrared proximity sensor that detects light like a human eye. Designed using the company’s proprietary BiCMOS technology, it integrates three optical sensors, two ADCs and digital functionality into a 2 x 2 x 0,6 mm package. The IC consumes just 5 μA when the ambient sensor is enabled, and only 7 μA when both the proximity sensor and ambient light sensor are activated.

Once a sensed signal is received, it is run through a DC ambient, infrared (IR) rejection front-end circuit and sent to an ADC. This process allows the MAX44000 to operate in the presence of large amounts of DC IR radiation. By using a single-pulse technique for pulsing the external IR LED, the sensor is immune to fixed-frequency external IR radiation.

Traditional light sensors are strongly influenced by ultraviolet (UV) and IR light, which are not perceptible by the human eye. Sensing this light leads to inaccurate ambient-light readings. Maxim’s BiCMOS technology enables the integration of the two photodiodes and an optical filter to reject UV and IR light. This allows the MAX44000 to replicate the optical response of the human eye in a variety of environments.

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