STPM01 datasheet(32/56 Pages) STMICROELECTRONICS

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Theory of operation

STPM01

32/56

000101

PST

Current channel sensor type, gain and tamper selection:

- PST=0: primary is coil x8 (x16 if ADDG=1), secondary is not used, no tamper

- PST=1: primary is coil x24 (x32 if ADDG=1), secondary is not used, no tamper

- PST=2: primary is CT x8, secondary is not used, no tamper

- PST=3: primary is shunt x32, secondary is not used, no tamper

- PST=4: primary is coil x8 (x16 if ADDG=1), secondary is coil x8 (x16 if

ADDG=1), tamper

- PST=5: primary is coil x24 (x32 if ADDG=1), secondary is coil x24 (x32 if

ADDG=1), tamper

- PST=6: primary is CT x8, secondary is CT x8, tamper

- PST=7: primary is CT x8, secondary is shunt x32, tamper

000110

000111

7 (1)

001000

FRS

In case the voltage channel frequency is out of the useful band (BFR signal),

this bit set the way to compute the power.

- FRS=0: power is set to zero;

- FRS=1: the nominal voltage is used to compute the power;

001001

MSBF

Bit sequence output during record data reading selection:

- MSBF=0: msb first

- MSBF=1: lsb first

001010

FUND

This bit swap the information stored in the type0 (first 20 bits of DAP register)

and type1 (first 20 bits of DFP register) active energy.

- FUND = 0: type 0 contains wide band active energy, type1 contains

fundamental active energy

- FUND = 1: type 0 contains fundamental active energy, type1 contains wide

band active energy

001011

ABS

Power accumulation type selection on Active, Reactive and Apparent energies:

- ABS=0: signed accumulation,

- ABS=1: absolute accumulation

001100

LTCH

No load condition threshold as product between VRMS and IRMS:

LTCH=0

800

LTCH=1

1600

LTCH=2

3200

LTCH=3

6400

001101 13 (1)

001110

KMOT

Constant of stepper pulses/kWh (see par. 16) selection when APL=2 or 3:

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)

Selection of pulses for LED when APL=0:

KMOT=0

Type0 Active Energy

KMOT=1

Type1 Active Energy

KMOT=2

Reactive Energy

KMOT=3

Apparent Energy

Table 16.

Configuration bits map

Address

Name

N. of

bits

Description (1)

6-BIT

Binary

DEC

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