描述 Description

AS6031 is an ultrasonic flow converter for the next generation of ultrasonic water and heat meters. It is highly integrated and is based on the TDC-GP30 platform. 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 handling weaker receive amplitudes. Additional features for phase-modulated hit identification give even more robustness to the first hit level detection. The integrated low-power CPU can use 4k of NVRAM and 4k of ROM code to do the flow calculation on chip.AS6031 simplifies the design of ultrasonic water and heat meters, combining the precise measurement and the complex flow calculation. It provides outstanding low-flow detection capability due to excellent zero-flow drift. Users can apply any of-the-shelf μP for handling all other tasks like display management or wireless communication and a complete meter device. The integrated standard pulse interface enables one-to-one replacement of mechanical meters by AS6031 based single-chip heat and water meters – customer μP and software remains unchanged.The ultra-low-current capabilities allow the use of standard AA batteries at 6-8 Hz measuring frequency even in the water meter version. The chip comes in a compact QFN48 package and allows compact designs thanks to a small number of external components.

特性 Features

? 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)

應(yīng)用 Application

? Water meters for utilities

? Industrial water meters

? Heat meters

? Gas meters

? Volume counters