AS6031(F1) Ultrasonic Flow Converter

AS6031 Ultrasonic Flow Converter

AS6031 is an ultrasonic flow converter based on the TDC-GP30 platform for water and heat meters.

It uses the same high-performant front-end for driving the transducers and processing the receive signal to extract the time of flight information. An additional programmable amplifier allows to handle weaker receive signals. The split burst enables the detection and correction of a phase jump and gives more robustness to the first hit level detection.

AS6031 provides outstanding low-flow detection capability due to excellent zero-flow drift. The low-power CPU can use 4k of NVRAM & ROM code to do the flow calculation at a few µA current only.

AS6031F1 comes with a flow firmware already on chip, which simplifies the design of ultrasonic water meters and reduces time to market. It covers the whole ultrasonic measurement task so that users have the full flexibility in the choice of the meters central processor and can continue with their existing platforms and software libraries.

AS6031 Ultrasonic Flow Converter

AS6031(F1) features and benefits


  • High performance + ultra-low power 32-Bit CPU
  • 120 * 32 bit NVRAM (non-volatile RAM) for user firmware parameter & data
  • 3968 * 8 bit NVRAM (non-volatile RAM) for user firmware program code
  • 4k * 8 bit ROM for system task code and special flow library code
  • Advanced high-precision analog front-end for transducer frequencies of 50 kHz to 4 MHz at 2.5 V to 3.6 V drive voltage
  • Integrated PGA, gain 2 to 30 @ 1 MHz
  • First hit level and phase detection
  • Amplitude measurement
  • Up to 31 zero crossing measurements
  • Precision time-to-digital converter and low-noise front-end with < 50 ps single shot with good 1MHz transducers on a DN20
  • Ultra-low power consumption
  • SPI serial interface
  • General Purpose I/O Unit incl. pulse interface and 2-wire master interface (I2C like)
  • Supply voltage 2.5 to 3.6 V
  • 3.0 to 3.6 V NVRAM store only
  • Operating temperature -40 to 85°C
  • QFN48 package (7 x 7mm²)


  • Single-chip solution provided ready flow information
  • System design compatible with mechanical meters
  • High flexibility in choice for external μP handling communication and further data management
  • Precision down to low flow rates
  • Leakage detection
  • Handles weak signals for small transducers and multiple reflections
  • Compact design
  • Low BOM

Product properties

  • Analog Frontend Yes, with PGA
  • First Wave Detection Yes, split burst
  • Amplitude Measurement Yes
  • Number of hits 31
  • Resolution TDC [ps] 22
  • Operating Supply Range 2.5 to 3.6
  • Interface SPI, Pulse, 2-wire master
  • CPU 32-bit
  • Firmware -
  • Memory 4k NVRAM, 4k ROM
  • GPIO 5
  • Ambient Temperature Range [°C] -25 to +85
  • Package QFN48


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Development kit

The AS6031-DK development kit allows customers a quick and intuitive approach to using the AS6031 UFC in ultrasonic flow meter applications.