AS6031 Ultrasonic Flow Converter

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

The transducers are driven by the same high-performance front-end, which also processes the received signal to extract the time of flight data. Weaker receive signals can be handled by adding another programmable amplifier. The split burst strengthens the initial hit level detection and makes it possible to identify and correct phase jumps.

AS6031’s excellent zero-flow drift allows for exceptional low-flow detection performance. The flow calculation can be performed by the low-power CPU using 4k of NVRAM and ROM code at a few µA current only.

The AS6031F1 comes with a flow firmware on the chip, which speeds up time to market and streamlines the design of ultrasonic water meters. It handles every aspect of ultrasonic measurement, giving users complete control over the central processor of the meter and allowing them to continue with their current platforms and software libraries.

Ultrasonic Flow Converters (UFC)

AS6031 FEATURES

• High performance + ultra-low power 32-Bit CPU with:
• 120 * 32 NVRAM (non-volatile RAM) for user firmware parameter & data
• 3968 * 8 bit NVRAM (non-volatile RAM) for user firmware program code
• 4k * 8 ROM for system task code and special flow library code
• Advanced high-precision analog front-end for transducer frequences 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 frontend 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 (7x7mm²)

AS6031 BENEFITS

• Single-chip solution provides ready flow information
• System design compatible with meachanical 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

AS6031 SPECIFICATIONS

Applications