AS8501

1.1 www.DataSheet4U.com 2 AS8501 Preliminary Data Sheet 3 High precision voltage and current measurement sensor interface DATA SHEET 1 ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ Features 16 bits resolution Differential inputs Single + 5V supply Low power 15 mW SOIC16 package Self- and system-calibration with auto-calibration on power up 16 kHz maximum sampling frequency Internal temperature measurement Internal factory trimmed precision reference Programmable current sources Digital comparator Active wake-up PGA gains 1, 6, 24, 50, 100 Zero offset Zero offset TC Extremely low noise Internal oscillator with comparator for active wake up 3-wire serial interface, μP compatible Temperature range – 40 to + 125 °C Individual 24-bit serial number INTERNAL TEMPERATURE REF AGND VDDA VSSA 1.26 V REFERENCE CALIBRATION DATA VDDD ETR BUF INPUT MUX CHOPPER 16 BIT - CONVERTER PROTECTION VSSD ETS VBAT RSHH PGA and LEVEL SHIFT DSP CONTROLLER FILTER INT. CLOCK TIMER CLK EZPRG RSHL 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 µV 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 applica...