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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STPMC1 датащи(PDF) 30 Page - STMicroelectronics |
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STPMC1 датащи(HTML) 30 Page - STMicroelectronics |
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30 / 77 page  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 ∑ > + + + = 256 I I I I I I MAX N T S R X () 8 I i X RMS X ∑ ∑ > () 32 I 4 i 4 i sIRMS X RMS X RMS X ∑ ∑ ∑ > = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ = |
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