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STPM32 Datasheet(PDF) 59 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  89 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM32 Datasheet(HTML) 59 Page - STMicroelectronics

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Table 40. Power offset LSB
Parameter
Value
Power LSB value
LSBP= Vref2∙ 1+R1R2
kint∙AV∙AI∙kS∙calV∙calI∙228 WLSB
Power offset LSB value
LSBPO=LSBP∙22= Vref2∙ 1+R1R2
kint∙AV∙AI∙kS∙calV∙calI∙228∙22 WLSB
Power offset can be compensated by measuring the power value when the current I = 0, if the average value is
not null; the value is due to external influences, then an opposite value should be applied to the power offset
register.
Note:
The apparent power offset OFSx is not added to apparent power, but directly to apparent energy (either RMS or
vectorial apparent energy). In case of vectorial apparent power calculation, an offset applied to active or reactive
energy will be reflected also on the apparent power.
STPM32, STPM33, STPM34
Application calibration
DS10272 - Rev 13
page 59/89



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