CS5490-ISZR View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS5490-ISZR

Two Channel Energy Measurement IC

Cirrus Logic 

CS5490

6.6.49 Gain for Voltage (VGAIN) – Page 16, Address 35

MSB

LSB

21

20

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

Default = 1.0

Gain register VGAIN is initialized to 1.0 on reset. During gain calibration, the VGAIN register is written with the

multiplicative inverse of the gain measured. This is an unsigned fixed-point value in the range of

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

6.6.50 Average Active Power Offset (POFF) – Page 16, Address 36

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

Default = 0

Average Active Power Offset (POFF) is added to the averaged active power to yield PAVG register results. It

can be used to reduce systematic energy errors. This is a two's complement value in the range of

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

6.6.51 Average Reactive Power Offset (QOFF ) – Page 16, Address 38

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

Default = 0x00 0000

Average Reactive Power Offset (QOFF) is added to the averaged active power to yield QAVG register results.

It can be used to reduce systematic energy errors. It is a two's complement value in the range of

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

6.6.52 AC Offset for Current (IACOFF) – Page 16, Address 37

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

Default = 0

AC offset register IACOFF is initialized to zero on reset. It is used to reduce systematic errors in the RMS re-

sults. This is an unsigned value in the range of 0  value  1.0, with the binary point to the left of the MSB.

6.6.53 Temperature Gain (TGAIN) – Page 16, Address 54

MSB

LSB

27

26

25

24

23

22

21

20

..... 2-10 2-11 2-12 2-13 2-14 2-15 2-16

Default = 0x 06 B716

Register TGAIN is used to scale the Temperature register (T), and is an unsigned fixed-point value in the range

of 0.0value256.0, with the binary point to the right of bit 16.

Register T can be rescaled by the application using the TGAIN and TOFF registers. Refer to section 7.3 Tem-

perature Sensor Calibration on page 53 for more information.

DS982F2

49

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