The TMIS7701 is a 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 TMIS7701 ideal for time-offlight sensing, such as in centimeter accuracy  LIADR application and ultrasonic flow metering. TMIS7701 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.