STPMC1 ST Microelectronics, STPMC1 Datasheet - Page 35

• Manufacturer Part Number: STPMC1
• Description: Programmable poly-phase energy calculator IC
• Manufacturer: ST Microelectronics

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STPMC1
Table 20.
9.14
Table 21.
9.15
(2 bits)
ABS
0
1
2
3
APL (2 bits)
2
3
3-phase Ferraris mode
Absolute accumulation per
phase
Ferraris mode per phase
Signed accumulation
LED pin configuration for APL = 2, 3
Negative power accumulation (configuration bit ABS, status
bit SIGN)
The ABS bits govern energy accumulation in case of negative power; they only affect active
power P and fundamental active power F.
The 3-ph status bit SIGN depends upon 3-ph cumulative power direction while the phase
status bits SIGN
Table 21
Accumulation mode for negative power
Phase delay calculation
The STPMC1 allows the calculation of the phase delays between voltages. If the line
frequency f
Accumulation mode
shows power calculation modes according to ABS
line
KMOT (2 bits)
is 50 Hz, a 120° phase delay corresponds to 6.7 ms.
X
depends upon phase X power direction.
0
1
2
3
-
P = P
P = |P
if P
P = P
P = P
Power calculation
X
< 0
Doc ID 15728 Rev 1
R
R
R
R
+ P
| + |P
+ P
+ P
P
S
S
S
Active energy wide band P
Active energy wide band P
X
S
+ P
+ P
+ P
| + |P
= 0
LED energy output
T
T
T
T
|
P < 0
P
P
P
P < 0
P
3-ph SIGN
0
0
0
0
SIGN = 0
SIGN = 1
SIGN = 1
SIGN = 1
SIGN = 0
SIGN = 1
P < 0
P
P
P
P < 0
P
Phase
3-ph
3-ph
Theory of operation
0
0
0
0
MA - MB
see
see
see
see
MA and MB low
see
Figure 11
Figure 11
Figure 11
Figure 11
Figure 11
C/128
C/256
Freq
C/64
C/32
C
35/76