Simplified circuit of the electricity measurement system (single-phase energy measurement system AD7751)

Published:2011/5/11 8:52:00 Author:Christina | Keyword: Simplified circuit, electricity measurement system, single-phase, energy measurement system | From:SeekIC

The simplified circuit of the electricity measurement system which is composed of the AD7751 and 89C51 singlechip is as shown in the figure. C1～C4 are the retreat coupling capacitance of the power supply. R connects to the VDD through the pull-up resistor (R=1), so the reset end failures. The crystal oscillator circuit is composed of the 3.579545MHz quartz crystal and the capacitors C5, C6, this crystal oscillator circuit supplies the clock to the AD7751. C7 is the de-noising capacitance of the UREF(I/O) end.



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