As shown in the table to the right, ON time scales with sleep time as a result of the combined sleep clock inaccuracy. In this example, the combined sleep clock accuracy is 80ppm. ON time is extended from 2.9ms at sleep time of 100ms, to 5.2ms at sleep time of 16 seconds. Note that it’s the Receiver window (RX window) widening that contributes to the ON time extension.