AS6040 is an ultrasonic flow converter (UFC) solution dedicated to gas meters, but suitable for water meters, too.
It is made up of four main parts: the supervisor, the front end, the post-processing unit, and the interface. The supervisor is the master of the system and controls all of the other parts, making the AS6040 autonomous.
The front end has a high-voltage driver, an integrated PGA, an offset-stabilized comparator in the receive path, a precision TDC for the time-of-flight measurement, amplitude measurement, and an RDC unit for temperature measurement.
In flow meter mode, the 32-bit CPU and the post-processing unit calculate the flow. In time conversion mode, the CPU is inactive, and the chip sends the raw time-of-flight data.
The AS6040 communicates with an external microcontroller via SPI interface. It can also run in stand-alone mode using the integrated pulse interface.
The AS6040 development kit allows customers a quick and intuitive approach to using the AS6040 UFC in ultrasonic flow meter applications.
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