Silicon Labs provides solutions for active proximity sensing. A proximity sensing system is comprised of two elements: the IR emitter and the IR detector. The emitter generates the energy using an IR LED and control circuitry. The IR energy is transmitted through the mechanical assembly and is reflected back to the measurement system by an object in proximity. Within the mechanical assembly there is also an IR detector or photodiode. The photodiode generates a current output proportional to the incident light when a bias voltage is applied. The intensity of the light received by the photodiode is then communicated to an MCU such as the C8051 family from Silicon Labs. The MCU can then process the data and generate a measurement of the distance of the reflective object. There are several additional aspects that may be associated with proximity detection. Some Silicon Labs proximity sensors utilize a second photodiode to compensate for ambient light sources (Si1120). These diodes compensate for additional IR energy present in the environment due to light sources not associated with the measurement system. Examples of such light sources are incandescent and fluorescent lighting. Adding the second photodiode enhances the IR proximity detection by providing a method to compensate for the additional energy present.