ams : TDC-GP30-F01 – Single-chip hardware and software solution for ultrasonic water-flow metering

ams has released the TDC-GP30-F01, an ultrasonic flow-meter IC which provides a complete hardware and firmware measurement solution for cold-water meters.

Drawing a continuous current of just 8.5μA when capturing flow measurements at a rate of 8Hz, the chip operates for up to 20 years from a single AA lithium battery.

The TDC-GP30-F01 includes an ultrasonic flow-measurement front-end, a low-power 32-bit processor, and firmware for converting the sensor’s analogue outputs to measurements of cold-water flow, volume and temperature. This means that designers of water meters can use the TDC-GP30-F01 to easily and rapidly implement a complete new ultrasonic water meter without developing their own firmware.

The flexible device may be adapted to complement a range of typical spool-piece designs: users only need to characterise their spool pieces. ams provides a full suite of hardware and software tools for evaluating, developing and characterising designs.

Users also have the option to add their own firmware code. For example, the TDC-GP30-F01’s firmware may be extended easily to implement a heat-meter application.

The chip provides a direct connection to ultrasonic transducers, and only requires the addition of a simple microcontroller to operate a water-meter’s peripheral functions, such as a
display and connectivity.

Designs can therefore be made more compact, with a lower component count than competing approaches that require a complex companion processor for elaborate calculations, and other external components.

The TDC-GP30-F01 allows designers to build systems which offer very accurate measurements of water flow and volume, making it suitable for use in water meters which are regulated by law. The device measures the difference in the time it takes ultrasound waves to travel upstream and downstream, providing extremely repeatable, temperature-stable and accurate timing measurements.


  • Detects leakage rates as low as 0.5 litres/hour
  • SPI and UART interfaces
  • Pulse interface for emulation of mechanical water-meter’s output
  • Firmware implements error handling and bubble detection
  • Ambient temperature range:-40°C to 125°C


  • Cold-water meters
  • Heat meters
  • Flow meters


TE’s MS5525DSO

The GP30-DEV-KIT provides for the easy evaluation of the TDC-GP30-F01 ultrasonic flow converter. The kit offers user-friendly configuration of the TDC-GP30-F01, as well as data acquisition for calibration.
Orderable Part Number: GP30-DEV-KIT