STPMC1 datasheet(46/77 Pages) STMICROELECTRONICS

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Theory of operation

STPMC1

46/77

Doc ID 15728 Rev 6

iCT = α iN + α iS + β iR

iCN = α iT + β iS + γ iR

9.17

Data records map

There are seven groups of four data records available, each consisting of a parity nibble

(see paragraph

9.17.8) and 28-bit data field.

The data records have fixed position of reading. This means that no addressing of records is

necessary. It is up to an application to decide how many records should read out from the

device. If an application sends to device a precharge command (see paragraph

9.20) before

the reading of a group, the internal group pointer is incremented. This way, a faster access

to later groups is possible. Below are shown all the groups, their position within the

sequence of reading, and the name and assembly of data records.

9.17.1

Group 0 data records

0.1 DAP:

●

3- phase active energy wide band: 20-bit accumulator of 3-ph active energy wide band

(see paragraph

9.11)

●

3-ph lower status: bits [0:7] of 3-phase status (see

Table 31)

0.2 DRP:

●

3- phase reactive energy: 20-bit accumulator of 3-ph reactive energy (see paragraph

9.11)

●

3-ph up status: bits [8:11] of 3-phase status (see

Table 31)

●

TSG bits: 4 TSG mode signal (see paragraph

9.20)

0.3 DFP:

●

3-phase active energy fundamental: 20-bit accumulator of 3-ph active energy from

fundamental harmonic (see paragraph

9.11)

●

system signals: commands BANK-PUMP-TST0-TST1-TST2-RD-WE-precharge (see

paragraph

9.20)

Figure 14.

Group 0 data records

parity

3-phase active energy wide band

3-ph lower status

DAP

DRP

DFP

PRD

parity

DC uN

period

parity

3-phase active energy fundamental

system signals

12 bit

4 bit

16 bit

4 bit

20 bit

8 bit

parity

TSG bits

3-phase reactive energy

3-ph up status

parity

3-phase active energy wide band

3-ph lower status

DAP

DRP

DFP

PRD

parity

DC uN

period

parity

3-phase active energy fundamental

system signals

12 bit

4 bit

16 bit

4 bit

20 bit

8 bit

parity

TSG bits

3-phase reactive energy

3-ph up status

parity

3-phase active energy wide band

3-ph lower status

DAP

DRP

DFP

PRD

parity

DC uN

period

parity

3-phase active energy fundamental

system signals

12 bit

4 bit

16 bit

4 bit

20 bit

8 bit

parity

TSG bits

3-phase reactive energy

3-ph up status

parity

3-phase active energy wide band

3-ph lower status

DAP

DRP

DFP

PRD

parity

DC uN

period

parity

3-phase active energy fundamental

system signals

12 bit

4 bit

16 bit

4 bit

20 bit

8 bit

parity

TSG bits

3-phase reactive energy

3-ph up status

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