CS5490-ISZR View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS5490-ISZR

Two Channel Energy Measurement IC

Cirrus Logic 

CS5490

6.6.54 Temperature Offset (TOFF) – Page 16, Address 55

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 = 0xD5 3998

Register TOFF is used to offset the Temperature register (T), and is a two's complement value in the range of

-128.0value128.0 (°C), 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.

6.6.55 Calibration Scale (Scale) – Page18, Address 63

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 = 0x4C CCCC (0.6)

The Scale register is used in the gain calibration to set the level of calibrated results of I-channel RMS. During

gain calibration, the IRMS results register is divided into the Scale register. The quotient is put into the IGAIN

register. 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. Negative values are not used.

6.6.56 Zero-crossing Number (ZXNUM) – Page 0, Address 55

MSB

LSB

223

222

221

220

219

218

217

216

.....

26

25

24

23

22

21

20

Default = 0x00 0064 (100)

ZXNUM is the number of zero crossings used for line frequency measurement. It is an integer in the range of

1 to 8,388,607. Zero should not be used.

6.6.57 V-channel Zero-crossing Threshold (VZXLEVEL) – Page 18, Address 58

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 = 0x10 0000 (0.125)

VZXLEVEL is the level that the peak instantaneous voltage must exceed for the zero-crossing detection to

function. 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. Negative values are not used.

6.6.58 I-channel Zero-crossing Threshold (IZXLEVEL) – Page 18, Address 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

Default = 0x10 0000 (0.125)

IZXLEVEL is the level that the peak instantaneous current must exceed for the zero-crossing detection to func-

tion. 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. Negative values are not used.

50

DS982F2

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