CS5463 datasheet(28/44 Pages) CIRRUS

28 / 44 page

CS5463

DS678PP1

6.1.6 Instantaneous Current, Voltage, and Power Registers ( I , V , P )

Address: 7 (Instantaneous Current); 8 (Instantaneous Voltage); 9 (Instantaneous Power)

I and V contain the instantaneous measured values for current and voltage, respectively. The instantaneous

voltage and current samples are multiplied to obtain Instantaneous Power (P). The value is represented in two's

complement notation and in the range of -1.0

≤ I, V, P < 1.0, with the binary point to the right of the MSB.

6.1.7 Active (Real) Power Register ( PActive )

Address: 10 (Active Power)

The instantaneous power is averaged over each computation cycle (N conversions) to compute Active Power

(PActive). The value will be within in the range of -1.0 ≤ PActive< 1.0. The value is represented in two's complement

notation, with the binary point to the right of the MSB.

6.1.8 RMS Current & Voltage Registers ( IRMS , VRMS )

Address: 11 (IRMS); 12 (VRMS)

IRMS and VRMS contain the Root Mean Square (RMS) values of I and V, calculated each computation cycle. The

value is represented in unsigned binary notation and in the range of 0.0

≤ IRMS,VRMS < 1.0, with the binary point

to the left of the MSB.

6.1.9 Epsilon Register (

ε )

Address: 13

Default = 0x01999A = 0.0125 sec

Epsilon (

ε) is the ratio of the input line frequency to the sample frequency of the ADC (See Section 5.4 Perform-

ing Measurements

on page 16). Epsilon is either written to the register, or measured during conversions. The

value is represented in two's complement notation and in the range of -1.0

≤

ε < 1.0, with the binary point to the

right of the MSB. Negative values have no significance.

MSB

LSB

-(20)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

-(20)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

-(20)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

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