CDB5467U【PDF 30/46 页】BOARD EVAL FOR CS5467 ADC

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CS5467

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 )

MSB

LSB

-(2 )

2

2

2

2

2

0

2

-1

2

-2

-3

-4

-5

-6

-7

.....

2 -17

2

-18

2

-19

2

-20

2

-21

2

-22

2 -23

I1 ( I2 ) and V1 ( V2 ) contain instantaneous current and voltage, respectively, which are multiplied to yield instan-

taneous 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 )

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

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 )

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

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 )

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

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 )

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

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.

30

DS714F3

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