The TMIS7702 is a two-channel time to digital  converters (TDC). It performs the function of a  stopwatch and measures the elapsed  picoseconds to microseconds between a  START pulse and up to five STOP pulses. The  ability to measure from START to multiple  STOPs gives users the flexibility to select which  STOP pulse yields the best echo performance. The device has an internal self-calibrated time  base which compensates for drift over time and  temperature. Self-calibration enables time-todigital conversion accuracy in the order of  picoseconds. The high time resolution and  accuracy make TMIS7702 ideal for time-offlight sensing, such as in centimeter accuracy  LIADR application and ultrasonic flow metering. TMIS7702 can work in the Autonomous MultiCycle Averaging Mode. In this mode, the host  can go to sleep to save power, and it can wake  up when interrupted by the TDC upon  completion of the measurement sequence.  This working mode is optimized for low system  power consumption, making it ideal for battery  powered flow meters.