STPM11 datasheet(28/45 Pages) STMICROELECTRONICS

28 / 45 page

Theory of operation

STPM11/12/13/14

28/45

001010

FUND

This bit swaps the energy type between fundamental or wide band.

- FUND=0: wide band active energy up to 50th harmonic;

- FUND=1: fundamental active energy

001011

ABS

Power accumulation type selection:

- ABS=0: signed accumulation,

- ABS=1: absolute accumulation

001100

LTCH

No-load condition constant:

LTCH=0

→800

LTCH=1

→1600

LTCH=2

→3200

LTCH=3

→6400

001101

13 (1)

001110

KMOT

Constant of stepper pulses/kWh (see par. 7.14) selection:

If LVS=0,

KMOT=0

→P/64

KMOT=1

→P/128

KMOT=2

→P/32

KMOT=3

→P/256

If LVS=1,

KMOT=0

→P/640

KMOT=1

→P/1280

KMOT=2

→P/320

KMOT=3

→P/2560

001111

15 (1)

010010

BGTC

Bandgap temperature compensation bits. See Figure 16. for details.

010011

19 (1)

010100

CPH

4-bit unsigned data for compensation of phase error, 0°+0.576°

16 values are possible with a compensation step of 0.0384°. When CPH=0

the compensation is 0°, when CPH=15 the compensation is 0.576°.

010101

010110

010111

23 (1)

011000

CHV

8-bit unsigned data for voltage channel calibration.

256 values are possible. When CHV is 0 the calibrator is at -12.5% of the

nominal value. When CHV is 255 the calibrator is at +12.5%. The calibration

step is then 0.098%.

011001

011010

011011

011100

011101

011110

011111

31 (1)

Table 14.

Configuration bits map (continued)

Address

Name

N. of

bits

DESCRIPTION (1)

6-BIT

Binary

DEC

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