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STPM33 Datasheet(PDF) 59 Page - STMicroelectronics

Part # STPM33
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

STPM33 Datasheet(HTML) 59 Page - STMicroelectronics

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DS10272 Rev 8
59/121
STPM32, STPM33, STPM34
Theory of operation
121
To calculate the filtering time for the sag event, we consider the time in which the nominal
instantaneous voltage is below the sag threshold, that is:
Equation 15
To correctly distinguish between normal sinusoidal voltage and sag event, the filtering time
should be added to this component, for example half line period (10 ms at 50 Hz). Since
LSB of SAG_TIME_THRx register is 8
s (FCLK = 125 kHz), the value to set is:
Equation 16
In the same way:
VSWELL: target RMS value of swell voltage
AV: voltage sensor gain
DSWELL = 210, length of swell threshold register
calV = 0.875, calibrator mid value
Following the above calculation we obtain the hexadecimal value of voltage swell threshold:
Register value
Register LSB RMS value
Table 17. Voltage swell
Parameter
Value
Register value
Register LSB RMS value
Table 16. Voltage sag (continued)
Parameter
Value
SAG
VSAG
Vref
-------------- AV
2calV
R2
R1 R2
+
--------------------

DSAG HEX


=
LSBSAG
R1 R2
+
 V
ref
AV
2R2 calV D
SAG

------------------------------------------------------------------ V

=
time
2 arc
VSAG
VL
--------------


sin
1000
2
f
L
------------- ms


=
SWELLV
VSWELL
Vref
--------------------- AV
2
R2
R1 R2
+
-------------------- calV D
SWELL HEX


=
LSBSWELL
Vref R1 R2
+

AV
2R2 calV D
SWELL

------------------------------------------------------------------------- V

=



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