STPM01 datasheet(35/60 Pages) STMICROELECTRONICS

35 / 60 page

STPM01

Theory of operation

Doc ID 10853 Rev 8

35/60

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

Power calculation when BFR=1 and PST

≠4,5 (no single wire mode)

- FRS=0: energy accumulation is frozen, power is set to zero;

- FRS=1: normal energy accumulation and power computation (p=u*i);

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

RESERVED

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 (continued)

Address

Name

n. of

bits

Description (1)

6-bit

binary

DEC

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