One important aspect of many systems that implement IR proximity is overall power consumption. Each component in the system contributes to the overall power budget and the Si1120 is no exception. However, when discussing active proximity measurements, the infrared LED is the primary consumer of energy. The Si1120 provides lower power operation by enabling single pulse operation thus limiting the amount of LED “on” time. This is contrasted to traditional approaches where multiple cycles are required to provide an integration of the light over a specified time period, thus consuming more current. In upcoming slides, this presentation will show how the Si1120 operates and highlight the PWM output as a representation of the light intensity. To summarize here, the pulse width increases with increased light intensity which provides a direct relationship to the current consumption. As light intensity increases, so does the power consumption due to the wider pulse width, however, the average power consumption is reduced.