STPMC1 ST Microelectronics, STPMC1 Datasheet - Page 28

• Manufacturer Part Number: STPMC1
• Description: Programmable poly-phase energy calculator IC
• Manufacturer: ST Microelectronics

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Theory of operation
9.10
9.10.1
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The 3-ph status bit BCF is the OR of each phase bit BFC, but it takes into account also the
connection of the neutral wire (DAN-I stream).
The other error condition occurs if the MOP, MON and LED pin outputs signals are different
from the internal signals that drive them. This can occur if some of this pin is forced to GND
or to some other imposed voltage value. In this case the internal status bit PIN is
immediately activated providing the information that some hardware problem has been
detected, for example the stepper motor has been mechanically blocked.
These two error condition don't influence energy accumulation.
Tamper detection module (status bits: BCS, BSF, BIF,
configuration bit ENH)
The tamper detection module is used to prevent theft of energy through improper connection
of the meter. The tamper indicator is activated when:
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●
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In standalone application mode (APL [1] = 1) the SDATD pin is used to notify the tamper
condition.
In 3-phase system (SYS = 0, 1, 2) this output is set if at least one of the internal status bits:
BCS, BSF, BIF has been set or if EMI has been detected.
In other systems (SYS
Example 4: Tamper output on SDATD pin
SYS = 0, 1 or 2 and APL [1] = 1:
BCS = 0, BSF = 0, BIF = 0
BCS = 0, BSF = 1, BIF = 1
SYS = 0, 1 or 2, APL [1] = 1 and ENH = 1:
BCS = 0, BSF = 0, BIF = 0, EMI = 0
BCS = 0, BSF = 0, BIF = 0, EMI = 1
BCS = 1, BSF = 1, BIF = 1, EMI = 1
In peripheral application mode these information can be read out by SPI interface checking
the 3-ph status bits, or the status bits corresponding to each phase.
Sum of currents is above tamper threshold (status bit BCS)
Tamper detection through bit BCS is meaningful only for SYS = 0, 2, 5, 6 (systems with
neutral wire). In other measurement systems it is not useful because there are not enough
input current streams.
The STPMC1 check tamper detection only if
sum of currents is above tamper threshold (status bit BCS = 1),
phase sequence is wrong (status bit BSF = 1),
phase active powers don't have the same sign (status bit BIF = 1),
electromagnetic interference (EMI) is detected (only with ENH = 1).
0, 1, 2) it indicates only BCS or EMI.
Doc ID 15728 Rev 1
Tamper (SDATD pin) = 0
Tamper (SDATD pin) = 1
∑
I
X
Tamper (SDATD pin) = 0
Tamper (SDATD pin) = 1
Tamper (SDATD pin) = 1
I
256
max
STPMC1