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STPM32 Datasheet(PDF) 58 Page - STMicroelectronics

No. de pieza STPM32
Descripción Electrónicos  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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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM32 Datasheet(HTML) 58 Page - STMicroelectronics

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Theory of operation
STPM32, STPM33, STPM34
58/121
DS10272 Rev 8
Figure 44. Swell detection process
Sag and swell threshold calculation
Thresholds for sag voltage detection are calculated below, according to the following input
parameters:
VL: line voltage nominal RMS value
VSAG: target RMS value of sag voltage
R1, R2: voltage divider resistors
AV = 2, voltage channel gain
DSAG = 210, length of sag threshold register
calV = 0.875, calibrator mid value
Table 16. Voltage sag
Parameter
Value
SAG peak voltage
Input signal
Percentage of FS input
Vin_SAG_peak FS

VSAG
Vref
-------------- AV
2calV
R2
R1 R2
+
--------------------

=



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