STPMC1 ST Microelectronics, STPMC1 Datasheet - Page 51

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

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STPMC1
9.18
Table 29.
Bit
10
11
0
1
2
3
4
5
6
7
8
9
Name
SIGN
BCF
PHR
PHS
PHT
BCS
BFF
BSF
HLT
PIN
BIL
BIF
Example 13: Parity calculation
Let us calculate parity of DMR, the first register of second group:
DMR:
prty = grp = 1
prty ^= *bp = 3
prty ^= *(bp+1) = 83
prty ^= *(bp+2) = 83
prty ^= *(bp+3) = 4B
prty ^= prty<<4 = FB
prty &= 0xF0 = F0
Status bits map
The STPMC1 includes 12 status bits for 3-phase cumulative, and 3 8-bit status byte, one per
each phase. All of them provide information about the current meter status.
3-phase status bits description
No-load condition not detected in any phase
BFR = 0 in all phases
Three-phase active energy is negative
Phase 0
Phase 0
Phase 0
Data records reading is valid
The output pins are consistent with the data
Sum of all phase currents is below threshold
Phase sequence is R -> S -> T
Phase energies have equal sign
02
signals alive in all phases
u
u
u
80
R
S
T
<
<
<
00
0
Doc ID 15728 Rev 1
C8
/* prty set to 1 - group #*/
/* xor it with 1st byte of data 02 */
/* xor it with the 2nd byte 80 */
/* and with the 3rd byte 00 */
/* and last, with the 4th byte C8 */
/* and with B0 */
/* parity is ok */
No-load condition detected in all phases
BFR = 1 in at least one phase
Three-phase active energy is positive
Phase
Phase
Phase
Data records are not valid.
A reset occurred and a restart is in progress.
The output pins are different from the data,
this means some output pin is forced to 1 or 0.
Sum of all currents above threshold
Phase sequence is not R -> S -> T
Phase energies do not have equal sign
signal stuck in at least one phase
u
u
u
R
S
T
< 2
< 2
< 2
1
Theory of operation
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