DESCRIPTION
The opened photodiode is capable of providing a photovoltaic response and coated with Infra Red cut off filter on a CMOS integrated circuit. The photovoltaic response is converted into digital counter value by the ALS ADC of 16 bit resolution. It closely approximates the human eye spectral response of visible wavelength. In addition, the MC8201 has another opened photodiode with IR pass filter in order to detect proximity of an object. When PS is enabled, the IR LED is turned on by the built-in IR LED driver. When the IR from the LED reaches an object and gets reflected back, the opened photodiode for proximity sensing converts the reflected IR light with center frequency of 850nm into current. The amount of current is converted into digital counter value by the PS ADC of 12-bit resolution. The counter value is inversely proportional to the square of the distance between the sensor and the object. The proximity detection feature operates well from bright sunlight to dark rooms.
ABOV
