Datasheet
STPM01 Theory of operation
Doc ID 10853 Rev 8 35/60
000101 5
PST 3
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 6
000111 7
(1)
001000 8 FRS 1
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 9 MSBF 1
Bit sequence output during record data reading selection:
- MSBF=0: msb first
- MSBF=1: lsb first
001010 10 FUND 1
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 11 1 RESERVED
001100 12
LTCH 2
No load condition threshold as product between V
RMS
and I
RMS
:
LTCH=0 800
LTCH=1 1600
LTCH=2 3200
LTCH=3 6400
001101 13
(1)
001110 14
KMOT 2
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