1 Features
1. Resolution: 55 ps
. Standard Deviation: 35 ps
. Measurement Range:
. Mode 1: 12 ns to 500 ns
. Mode 2: 250 ns to 8 ms
. Low Power Consumption: 0.5 μA (2 SPS)
. Supports up to 5 STOP Signals
. Autonomous Multi-Cycle Averaging Mode for Low
Power Consumption
. Supply Voltage: 2 V to 3.6 V
. Operating Temperature .40°C to 85°C
. SPI Host Interface for Configuration and Register
Access

2 Applications
• Flow Meter: Water Meter, Gas Meter, Heat Meter
• Magnetostrictive Position/Level Sensing
• Time-of-Flight in Drones (LIDAR, SONAR),
metering equipment and projectors
• Heat Cost Allocators

3 Description
The TDC7200 is a Time-to-Digital Converter (TDC)
for ultrasonic sensing measurements such as water
flow meter, gas flow meter, and heat flow meter.
When paired with the TDC1000 (ultrasonic analogfront-
end), the TDC7200 can be a part of a complete
TI ultrasonic sensing solution that includes the
MSP430, power, wireless, and source code.
The Time to Digital Converter (TDC) performs the
function of a stopwatch and measures the elapsed
time (time-of-flight or TOF) 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-to-digital
conversion accuracy in the order of picoseconds. This
accuracy makes the TDC7200 ideal for flow meter
applications, where zero and low flow measurements
require high accuracy.
When placed in the Autonomous Multi-Cycle
Averaging Mode, the TDC7200 can be optimized for
low system power consumption, making it ideal for
battery powered flow meters. 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.