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.