3 active power (p1avg , p2avg ), 5 instantaneous quadrature power (q1, q2), 6 reactive power (q1avg, q2avg ) – Cirrus Logic CS5464 User Manual
Page 29: Cs5464, 3 active power (p1, 4 rms current (i1, And voltage (v1, 6 reactive power (q1
CS5464
DS682F3
29
8.2.2 Instantaneous Current (I1, I2), Voltage (V1, V2), and Power (P1, P2)
Address: 1 (I1), 2 (V1), 3 (P2), 7 (I2), 8 (V2), 9 (P2)
I1
(I2) and V1 (V2) contain instantaneous current and voltage, respectively, which are multiplied to yield in-
stantaneous power, P1 (P2). These are two's complement values in the range of -1.0
value 1.0, with the
binary point to the right of the MSB.
8.2.3 Active Power (P1
AVG
, P2
AVG
)
Address: 4 (P1
AVG
), 10 (P2
AVG
)
Instantaneous power is averaged over each low-rate interval (N samples) to compute active power, P1
AVG
(P2
AVG
). These are two's complement values in the range of -1.0
value 1.0, with the binary point to the
right of the MSB.
8.2.4 RMS Current (I1
RMS
, I2
RMS
) and Voltage (V1
RMS
, V2
RMS
)
Address: 5 (I1
RMS
), 6 (V1
RMS
), 11 (I2
RMS
), 12 (V2
RMS
)
I1
RMS
(I2
RMS
) and V1
RMS
(V2
RMS
) contain the root mean square (RMS) values of I1 (I2) and V1 (V2), calcu-
lated each low-rate interval. These are unsigned values in the range of 0
value 1.0, with the binary point
to the left of the MSB.
8.2.5 Instantaneous Quadrature Power (Q1, Q2)
Address: 14 (Q1), 17 (Q2)
Instantaneous quadrature power, Q1 (Q2), the product of voltage1 (voltage2) shifted 90 degrees and current1
(current2). These are two's complement values in the range of -1.0
value 1.0, with the binary point to the
right of the MSB.
8.2.6 Reactive Power (Q1
AVG
, Q2
AVG
)
Address: 13 (Q1
AVG
), 16 (Q2
AVG
)
Reactive power Q1
AVG
(Q2
AVG
) is Q1 (Q2) averaged over every N samples. These are two's complement
values in the range of -1.0
value 1.0, with the binary point to the right of the MSB.
MSB
LSB
-(2
0
)
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
.....
2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
MSB
LSB
-(2
0
)
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
.....
2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
MSB
LSB
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
2
-8
.....
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
2
-24
MSB
LSB
-(2
0
)
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
.....
2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
MSB
LSB
-(2
0
)
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
.....
2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23