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AN3322 Datasheet(PDF) 14 Page - STMicroelectronics

Part # AN3322
Description  Watt-hour meter based on the STM32F101 microcontroller
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3322 Datasheet(HTML) 14 Page - STMicroelectronics

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Watt-hour meter using the STM32
AN3322
14/38
DocID18304 Rev 1
Figure 6 shows the connectors of the power meter (circles with the numbers 1, 2, 3, and 4)
and its connection to the network and load on the left side and voltage and current
measurement circuit on the right side. Voltage circuitry depicted in this image shows that the
voltage divider consists of resistors and a capacitor and it is referenced to Um (Vmid) voltage,
which is half of +VREF (2.5 V). The voltage divider has a gain of 0.0027. Um (Vmid) voltage is
also measured by the system.
Figure 6. Voltage circuitry of STM32 meter



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