AS8500

1.1 www.DataSheet4U.com 2 AS8500 Universal multi pupose data aquisition system 3 Data Sheet DATA SHEET 1 Features 16 bits resolution differential inputs Single + 5V supply Low power 15 mW SOIC16 package 16 kHz maximum sampling frequency internal temperature measurement internal reference programmable current sources digital comparator active wake-up PGA gains 6, 24, 50, 100 Zero offset Zero offset TC Extremely low noise Internal oscillator with comparator for active wake up 3-wire serial interface, !P compatible temperature range – 40 to + 125 °C INTERNAL TEMPERATURE REF AGND VDDA VSSA 1.26 V REFERENCE CALIBRATION DATA VDDD VSSD ETR BUF INPUT MUX CHOPPER PROTECTION 16 BIT - CONVERTER ETS VBAT RSHH DSP CONTROLLER FILTER INT. CLOCK TIMER CLK EZPRG RSHL PGA and LEVEL SHIFT COMPARATOR CURRENT SOURCES SERIAL INTERFACE / CONTROL REGISTERS SCLK SDAT INTN Figure 1: Functional Block Diagram the high internal chopping frequency the system is free of 1/f-noise down to DC.The 0-10 Hz noise is typical below 1 µ V i.e. as good or better than any other available chopper amplifier. For high speed synchronous measurements the chip can run in an automatic switching mode between two input channels with preprogrammed parameter sets. The circuit has been optimised for the application in battery management systems in automotive systems. As a front end data acquisition system it allows an high quality measurement of current, voltage and temperature of the battery. With a ...