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STPM12ATR Datasheet(PDF) 36 Page - STMicroelectronics

Part # STPM12ATR
Description  Single phase energy metering IC with pulsed output and digital calibration
PDF  45 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM12ATR Datasheet(HTML) 36 Page - STMicroelectronics

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Energy calculation algorithm
STPM11/12/13/14
36/45
[
[Eq. 11]
The signals process flow is the same as shown in the previous case, and even with the
formulas above, the result is the same.
The absence of any AC component allows a very fast calibration procedure. Averaging the
readings of several line periods is not needed. The active energy measurement is already
stable after one line cycle. Moreover the digital calibration allows saving time and space
compared to the hardware calibration made with resistor strings.
)
sin(
)
(
)
(
)
(
ϕ
ω+
⋅
−
=
=
⋅
′
=
′′
∫
t
I
t
i
dt
t
i
t
i



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