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STPM32 Datasheet(PDF) 3 Page - STMicroelectronics

Part # STPM32
Description  ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA
PDF  121 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM32 Datasheet(HTML) 3 Page - STMicroelectronics

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DS10272 Rev 8
3/121
STPM32, STPM33, STPM34
Contents
121
8.4.1
Active power and energy calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.4.2
Fundamental active power and energy calculation . . . . . . . . . . . . . . . . 43
8.4.3
Reactive power and energy calculation . . . . . . . . . . . . . . . . . . . . . . . . . 44
8.4.4
Apparent power and energy calculation . . . . . . . . . . . . . . . . . . . . . . . . . 46
8.4.5
Sign of power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
8.4.6
Calculation of power and energy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
8.4.7
RMS calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
8.4.8
Zero-crossing signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.4.9
Phase meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.4.10
Sag and swell detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
8.4.11
Tamper detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
8.4.12
AH accumulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8.4.13
Status bits, event bits and interrupt masks . . . . . . . . . . . . . . . . . . . . . . 62
8.5
Functional description of communication peripheral . . . . . . . . . . . . . . . . 65
8.6
Communication protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
8.6.1
Synchronization and remote reset functionality . . . . . . . . . . . . . . . . . . . 68
8.6.2
SPI peripheral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
8.6.3
UART peripheral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
8.6.4
UART/SPI status register and interrupt control register . . . . . . . . . . . . . 75
9
Application design and calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
9.1
Application design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Example: current transformer case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
9.2
Application calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
9.2.1
Voltage and current calibration (CHVx, CHCx bits) . . . . . . . . . . . . . . . . 81
9.2.2
Phase calibration (PHVx, PHCx bits) . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
9.2.3
Power offset calibration (OFAx, OFAFx, OFRx, OFSx bits) . . . . . . . . . . 85
10
Register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
10.1
Register map graphical representation . . . . . . . . . . . . . . . . . . . . . . . . . . 87
10.2
Configuration register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
10.3
UART/SPI registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
10.4
Data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
11
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
11.1
QFN24L (4x4x1) 0.5 pitch package information . . . . . . . . . . . . . . . . . . . 115



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