Digital Output from Light Sensor

The project pertains to ISL29020 which converts light input into digital output using high performance light sensor with low-light sensitivity.

Some of the added features of ISL29020 include great spectral response from state of the art photodiode array, good IR & UV rejection, maximum operating current of less than 65 uA, and wide dynamic range. The flicker at 50 Hz and 60 Hz produced by artificial light sources, are capable of being rejected by this ADC while the range of lux can be programmed by the user for optimized counts using the lux range select feature.

The typical power consumption is 55 uA in normal operation. There are two power-down modes provided in order to minimize the further consumption of power. The whole chip is shut down by the auto-power-down function after each conversion if polling is preferred over continuous measurement of light. A software through the I2C interface controls the other power-down mode. This interface produces digital output which is a very simple code, directly proportional to lux, and no complex algorithms

The use of ISL29020 is suitable for ambient light sensing solution for smart phones, portable computing devices, and GPS devices.

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