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STPM32 Datasheet(PDF) 54 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) 54 Page - STMicroelectronics

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Theory of operation
STPM32, STPM33, STPM34
54/121
DS10272 Rev 8
Figure 40. Zero-crossing signal
8.4.9
Phase meter
Phase meter detects:
The period of the voltage line
The phase-angle delay between voltage and current
Figure 41. Phase meter
Period measurement
Starting from ZRC signals, line period and voltage/current phase shift are calculated.
Period information for the two phases is located in DSP_REG1 register.
The measurement of the period is from ZRC signal of voltage channel. The period is
calculated like an average of last eight measured periods.
The initial values of period are set on 0x9C4 (2500). LSB of period is 8
s given by FCLK
clock = 125 kHz. Limits to consider the correct period are between 0x600 (1536) and 0x800
(3840) corresponding to a frequency range between 32.55 and 81.38 Hz.
If the voltage signal frequency is out of this range, PER_ERR status bit is set in
DSP_SR1/2.
PER_ERR = 0: period in the range
ZRC
Signal
GIPG2803141129LM
ZRC_V
Period
and
Phase-angle
detector
FClk 125kHz
ZRC_I
Cx_PHA [11:0]
PHx PERIOD[11:0]
PER_ERR
GIPG2803141133LM



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