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CS5464
8.3 Page 1 Registers
8.3.1 DC Offset for Current (I1 OFF , I2 OFF ) and Voltage (V1 OFF , V2 OFF )
Address: 0 ( I1 OFF ), 2 ( V1 OFF ), 7 ( I2 OFF ), 9 ( V2 OFF )
MSB
LSB
-(2 0 )
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
DC offset registers I1 OFF & V1 OFF ( I2 OFF & V2 OFF ) are initialized to zero on reset. During DC offset calibration,
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 (I1 GAIN , I2 GAIN ) and Voltage (V1 GAIN , V2 GAIN )
Address: 1 ( I1 GAIN ), 3 ( V1 GAIN ), 8 ( I2 GAIN ), 10 ( V2 GAIN )
MSB
LSB
2 1
2 0
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 registers I1 GAIN & V1 GAIN ( I2 GAIN & V2 GAIN ) are initialized to 1.0 on reset. During AC or DC gain calibration,
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 (P1 OFF , P2 OFF )
Address: 4 ( P1 OFF ), 11 ( P2 OFF )
MSB
LSB
-(2 0 )
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
Power offset P1 OFF ( P2 OFF ) is added to instantaneous power and averaged over a low-rate interval to yield
P1 AVG ( P2 AVG ) register results. It can be used to reduce systematic energy errors. 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.
8.3.4 AC Offset for Current (I1 ACOFF , I2 ACOFF ) and Voltage (V1 ACOFF , V2 ACOFF )
Address: 5 ( I1 ACOFF ), 6 ( V1 ACOFF ), 12 ( I2 ACOFF ), 13 ( V2 ACOFF )
MSB
LSB
2
2
2
2
2
-(2 0 )
2
-1
2
-2
-3
-4
-5
-6
-7
.....
2 -17
2
-18
2
-19
2
-20
2
-21
2
-22
2 -23
Default = 0
AC offset registers I1 ACOFF & V1 ACOFF ( V ACOFF & V2 ACOFF ) 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 binary point
to the right of the MSB.
DS682F3
33
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