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AN3322 Datasheet(PDF) 13 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) 13 Page - STMicroelectronics

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AN3322
Watt-hour meter using the STM32
1.8
Power and energy measurement by STM32 embedded ADC
This section gives a complete overview of the whole hardware and firmware of the STM32
power meter design. Figure 5 shows a block diagram of the firmware, Figure 6 and Figure 7
show the physical realization of the current and voltage path.
Figure 5. Complete block diagram of the algorithm used in STM32 power meter
Figure 5 shows the algorithm flow measurement.
A fast measurement of the current and voltage with injected noise from surrounding
environment triggered by network synchronized timer
Decimation of measured samples
RMS values computation
Use of a precise RTC clock source for energy computation.



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