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STPM32 Datasheet(PDF) 35 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) 35 Page - STMicroelectronics

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Figure 39. Zero-crossing generation
ZRC_V
ZCR detector
FClk 125kHz
ZRC_I
Vx Fund[23:0]
Cx Fund[23:0]
ZRC signal is delayed by an instantaneous voltage current signal: 5.1 ms (typical), as shown in Figure 40.
Figure 40. Zero-crossing signal
ZRC
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
ZRC_V
Period
&
Phase Angle
Detector
FClk 125kHz
ZRC_I
Cx_PHA[11:0]
PHx PERIOD[11:0]
PER_ERR
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 μs given by FCLK clock = 125 kHz. Limits
to consider the correct period are between 0x600 (1536) and 0xF00 (3840) corresponding to a frequency range
between 32.55 and 81.38 Hz.
STPM32, STPM33, STPM34
Functional description of hardwired DSP
DS10272 - Rev 13
page 35/89



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