Optical Sensor Feedback Gain controls the scale of the photocurrent response from the photodiode into the Piccolo MCU. Adjusting this parameter helps maintain high resolution of photocurrent response across all brightness levels.

At high brightness levels (continuous mode and some discontinuous mode LDC indexes), the sensor gain should be kept low to allow photodiode response to support high brightness outputs. At low brightness levels (dim discontinuous mode LDC indexes), sensor gain should be increased to increase resolution of the photocurrent response. This allows the Piccolo MCU to more accurately control lower brightness outputs from the LEDs. Increasing the optical sensor feedback gain of a desired coarse combination will decrease achievable minimum brightness outputs.