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TDC-GP30 Ultrasonic Flow Converter

System on chip solution for ultrasonic flow metering


  • High performance and ultra-low power 32-Bit CPU with 4k NVRAM and 4k ROM
  • Up to 31 multi-hits for flow measurement yield the highest accuracy
  • Advanced high-precision analog part
  • Transducers can be connected directly to GP30, no external components required
  • Amplitude measurements of receiving signal for secure bubble, aging and empty spool piece detection
  • High update rates with very low power consumption (e.g. 6 µA@8Hz)


  • Lowest power solution for ultrasonic water meters
  • On-chip firmware allows fastest time-to-market
  • Best measurement performance for leakage detection

Product parameters

Analog Frontend Yes
First Wave Detection Yes
Amplitude Measurement Yes
Number of Hits 31
Resolution [ps] 11
Operating Supply Range 2.5 to 3.6
Interface SPI, UART, Pulse
CPU 32-bit
Firmware -
Memory 4k NVRAM, 4k ROM
Ambient Temperature Range [°C] -40 to +125
Package QFN32, QFN40

General Description

TDC-GP30 is the next step in ultrasonic flow metering. It drastically simplifies the design of ultrasonic heat and water meters and is the necessary step for compact energy-saving ultrasonic water meters. The ultra-low current capabilities allow the use of standard 2/3 AA or AA lithium thionyl chloride batteries at 6-8 Hz measuring frequency even in the water meter version. The TDC-GP30 is a system on chip approach that allows you to perform all measurement tasks in one IC.

This product suits for the following applications:

  • Ultrasonic water meters
  • Ultrasonic heat meters
  • Ultrasonic gas meters
  • Industrial flow indicators


Title Category Headline Buy
TDC-GP30DemoKit Application Board Development Kit for TDC-GP30
TDC-GP30EvalKit Application Board Evaluation Kit for TDC-GP30, QFN40 package
ams-iESLab-GP30-Demo Application Board Ultrasonic Flow Sensing Module

Technical Documents

Type Description Language
Datasheet Volume 2 (CPU) English
Datasheet Volume 1 (General Description) English
Application Note Toggling GPIO pin of GP30 using open firmware section and ASM Source Code English
Application Note Toggling GPIO pin of GP30 using open firmware section English
Application Note Vol. 3 User Manual English
Application Note Simple FHL Regulation Method and ASM Source Code English
Application Note Simple FHL Regulation Method English
Application Note TDC-GP30 UART Communication English
Application Note TDC-GP30 Application note single transducer English
Application Note TDC-GP30 Application note gas meter English
Application Note Water / heat metering English
User Guide iESLab Module with TDC-GP30 English
User Guide TDC-GP30-DEV-KIT Reference Board Manual English

Environmental Documents

Type Description Language
Material Declaration Form MDF_502030003_TDC-GP30YD English
Material Declaration Form MDF_502030004_TDC-GP30YA English
RoHS Certificate RoHS Certificate TDC-GP30 English


Type Description Language
Product Change Notification Change Notification_MOQ Amendment_PCAPx_TDC-GPx_PS09FN (issued 2017-Mar) English
Product Change Notification CN13-2017 (PCAP0x, TDC-GPxx, PS09) English

Other Information

Type Description Language
Block Diagram TDC-GP30 Block Diagram English
Factsheet Building Static Water Meters of High Quality English
Video - Ultrasonic Flow Converter

Ultrasonic Flow Converter

The TDC-GP30 is an Ultrasonic Flow Converter which can be used for water metering in communities, cities or industrial applications. At Electronica we showcased how it can be used in cost-effective non-legal for trade applications with small spool piece.


Asset Publisher
Sciosense JV Teaser Environmental Sensors long

Ownership of this product has moved to Sciosense

Please be informed that this product is now owned by Sciosense B.V., a joint venture of ams AG and Wise Road Capital, effective January 13th, 2020.

ScioSense Environmental Sensors