STPMC1 datasheet(53/77 Pages) STMICROELECTRONICS

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STPMC1

Theory of operation

Doc ID 15728 Rev 6

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Example 17: Parity calculation

Let us calculate parity of DMR, the first register of second group:

DMR:

prty = grp = 1

/* prty set to 1 - group #*/

prty ^= *bp = 3

/* xor it with 1st byte of data 02 */

prty ^= *(bp+1) = 83

/* xor it with the 2nd byte 80 */

prty ^= *(bp+2) = 83

/* and with the 3rd byte 00 */

prty ^= *(bp+3) = 4B

/* and last, with the 4th byte C8 */

prty ^= prty<<4 = FB

/* and with B0 */

prty &= 0xF0 = F0

/* parity is ok */

9.18

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.

Table 31.

3-phase status bits description

Bit

Name

BIL

No-load condition not detected in any phase

No-load condition detected in all phases

BCF

ΣΔ signals alive in all phases

ΣΔ signal stuck in at least one phase

BFF

BFR = 0 in all phases

BFR = 1 in at least one phase

SIGN

Three-phase active energy is negative

Three-phase active energy is positive

PHR

Phase 0

≤ uR < π

Phase

π ≤ uR < 2π

PHS

Phase 0

≤ uS < π

Phase

π ≤ uS < 2π

PHT

Phase 0

≤ uT < π

Phase

π ≤ uT < 2π

HLT

Data records reading is valid

Data records are not valid.

A reset occurred and a restart is in progress.

The output pins are consistent with the data

The output pins are different from the data,

this means some output pin is forced to 1 or 0.

BCS

Sum of all phase currents is below threshold

Sum of all currents above threshold

BSF

Phase sequence is R -> S -> T

Phase sequence is not R -> S -> T

BIF

Phase energies have equal sign

Phase energies do not have equal sign

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