CS5461A datasheet(28/44 Pages) CIRRUS

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CS5461A

DS661F2

6.5 PulseRateE1,2 Register

Address: 6

Default = 0xFA000 = 32000.00 Hz

PulseRateE1,2 sets the frequency of the E1 and/or E2 pulses. The smallest valid frequency is 2

-4 with 2-5 incre-

mental steps. A pulse rate higher than (MCLK/K)/8 will result in a pulse rate setting of (MCLK/K)/8. The value

is represented in unsigned notation, with the binary point to the right of bit 5.

6.6 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.

6.7 Active (Real) Power Registers ( PActive )

Address: 10

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

(PActive). The value is represented in two's complement notation and in the range of -1.0 ≤ PActive< 1.0, with the

binary point to the right of the MSB.

6.8 IRMS and VRMS Registers ( IRMS , VRMS )

Address: 11 (IRMS); 12 (VRMS)

IRMS and VRMS contain the Root Mean Square (RMS) value of I and V, calculated over 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.

6.9 Power Offset Register ( Poff )

Address: 14

Default = 0x000000

Power Offset (Poff) is added to the instantaneous power being accumulated in the Pactive register and can be

used to offset contributions to the energy result that are caused by undesirable sources of energy that are in-

herent in the system. The value is represented in two's complement notation and in the range of -1.0

≤ Poff < 1.0,

with the binary point to the right of the MSB.

MSB

LSB

218

217

216

215

214

213

212

211

.....

2-1

2-2

2-3

2-4

2-5

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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