AS6031(F1) Ultrasonic Flow Converter

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.

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)

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