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STPMC1 Fiches technique(PDF) 30 Page - STMicroelectronics

No de pièce STPMC1
Description  Programmable poly-phase energy calculator IC
PDF  77 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPMC1 Fiches technique(HTML) 30 Page - STMicroelectronics

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Theory of operation
STPMC1
30/77
Doc ID 15728 Rev 6
The value IMAX corresponds to the maximum current value hold by each RMS current
register (internal value FFFF). It is a function of the sensor type, sensitivity and of the
current channel gain. Let us suppose that
IMAX = 180 A
The tamper condition is evaluated only if
This means that the sum of the RMS value of currents is not negligible with respect to
IMAX (the threshold corresponds to about 0.4% of IMAX).
In this case this is true since:
IR + IS +IT +IN = 14.4 A > 0,703125 A = IMAX / 256
The criterion for tamper detection is
This can also be expressed as
which means the sIRMS value must not exceed 3.13% of (IR + IS +IT +IN).
In this example:
sIRMS = 0,149967 < 0.45 = (IR + IS +IT +IN) / 32
Then BCS = 0.
Figure 11.
Currents of the three phase system in example
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