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STPM32 Datasheet(PDF) 60 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) 60 Page - STMicroelectronics

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Theory of operation
STPM32, STPM33, STPM34
60/121
DS10272 Rev 8
For the current swell, an analogue procedure can be followed:
ISWELL: target RMS value of swell current
kS: current sensor sensitivity [V/A]
AI: current sensor gain
calI = 0.875, calibrator mid value
The swell threshold is:
8.4.11
Tamper detection
The device includes a tamper detection module (the STPM34 and STPM33 only).
To enable this feature, TMP_EN bit and TMP_TOL[1:0] tamper tolerance have to be set in
DSP_CR3. Tamper detection feature is disabled by default. It is possible to choose among
four different tolerances according to Table 19:
Tamper module monitors active energy registers of the two channels. Tamper condition is
detected when the absolute value of the difference between the two active energy values is
greater than the chosen percentage of the averaged value. This occurs when the following
equation is satisfied:
Equation 17
|EnergyCH1 - EnergyCH2| > TOL * |EnergyCH1 + EnergyCH2|
where TOL is selected according to Table 19.
Detection threshold is much higher than the accuracy difference of the current channels,
which should be less than 0.2%, but, some headroom should be left for possible transition
effect, due to accidental synchronism of load current change at the rate of energy sampling
.
Table 18. Current swell
Parameter
Value
Register value
Register LSB RMS value
SWELLC
ISWELL
Vref
------------------- AI
2kS calI D
SWELL HEX


=
LSBSWELL
Vref
AI
2kS calI D
SWELL

--------------------------------------------------------------------- A

=
Table 19. Tamper tolerance setting
TMP_TOL[1:0]
Tamper tolerance
0x00
TOL = 12.5%
0x01
TOL = 8.33%
0x10
TOL = 6.25%
0x11
TOL = 3.125%



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