CS5467 datasheet(34/46 Pages) CIRRUS

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CS5467

DS714F3

8.3 Page 1 Registers

8.3.1 DC Offset for Current (I1OFF , I2OFF ) and Voltage (V1OFF , V2OFF )

Address: 0 (I1OFF ), 2 (V1OFF ), 7 (I2OFF ), 9 (V2OFF )

Default = 0

DC offset registers I1OFF & V1OFF (I2OFF & V2OFF ) are initialized to zero on reset. During DC offset calibra-

tion, selected registers are written with the inverse of the DC offset measured. The application program can

also write the DC offset register values. 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.

8.3.2 Gain for Current (I1GAIN , I2GAIN ) and Voltage (V1GAIN , V2GAIN )

Address: 1 (I1GAIN ), 3 (V1GAIN ), 8 (I2GAIN ), 10 (V2GAIN )

Default = 1.0

Gain registers I1GAIN & V1GAIN (I2GAIN & V2GAIN) are initialized to 1.0 on reset. During AC or DC gain calibra-

tion, selected register are written with the multiplicative inverse of the gain measured. These are unsigned

fixed-point values in the range of 0

 value  4.0, with the binary point to the right of the second MSB.

8.3.3 Power Offset (P1OFF , P2OFF )

Address: 4 (P1OFF ), 11 (P2OFF )

Default = 0

Power offset P1OFF (P2OFF ) is added to instantaneous power and averaged over a low-rate interval to yield

P1AVG (P2AVG ) register results. It can be used to reduce systematic energy errors. These are two's comple-

ment values in the range of -1.0

 value  1.0, with the binary point to the right of the MSB.

8.3.4 AC Offset for Current (I1ACOFF , I2ACOFF ) and Voltage (V1ACOFF , V2ACOFF )

Address: 5 (I1ACOFF ), 6 (V1ACOFF ), 12 (I2ACOFF ), 13 (V2ACOFF )

Default = 0

AC offset registers I1ACOFF & V1ACOFF (VACOFF & V2ACOFF ) are initialized to zero on reset. These are added

to the RMS results before being stored to the RMS result registers. They can be used to reduce systematic

errors in the RMS results. These are two's complement values in the range of -1.0

 value  1.0, with the bi-

nary point to the right of the MSB.

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

.....

2-16

2-17

2-18

2-19

2-20

2-21

2-22

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

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