Cs5484, 16 line to sample frequency ratio (epsilon), Page 16, address 49 – Cirrus Logic CS5484 User Manual
Page 47: 17 no-load threshold (load, Page 16, address 58, 18 sample count (samplecount), Page 16, address 51, 19 cycle count (cyclecount), Page 18, address 62
CS5484
DS981F3
47
6.6.16 Line to Sample Frequency Ratio (Epsilon)
–
Page 16, Address 49
Default = 0x01 999A (0.0125 or 50Hz/4.0kHz)
Epsilon is the ratio of the input line frequency to the OWR.
It can either be written by the application program or calculated automatically from the line frequency (from
the voltage channel 1 input) using the AFC bit in the Config2 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.
6.6.17 No-Load Threshold (Load
MIN
)
–
Page 16, Address 58
Default = 0x00 0000
Load
MIN
is used to set the no-load threshold for the anti-creep function.
When the magnitudes of P
SUM
and Q
SUM
are less than Load
MIN
, P
SUM
and Q
SUM
are forced to zero. When
the magnitude of S
SUM
is less than Load
MIN
, S
SUM
is forced to zero.
Load
MIN
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.
6.6.18 Sample Count (SampleCount)
–
Page 16, Address 51
Default = 0x00 0FA0 (4000)
Determines the number of OWR samples to use in calculating low-rate results.
SampleCount (N) is an integer in the range of 100 to 8,388,607. Values less than 100 should not be used.
6.6.19 Cycle Count (CycleCount)
–
Page 18, Address 62
Default = 0x00 0064 (100)
Determines the number of half-line cycles to use in calculating low-rate results when the CS5484 is in Line-cy-
cle Synchronized Averaging mode.
CycleCount is an integer in the range of 1 to 8,388,607. Zero should not be used.
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
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
MSB
LSB
0
2
22
2
21
2
20
2
19
2
18
2
17
2
16
.....
2
6
2
5
2
4
2
3
2
2
2
1
2
0
MSB
LSB
0
2
22
2
21
2
20
2
19
2
18
2
17
2
16
.....
2
6
2
5
2
4
2
3
2
2
2
1
2
0