Cs5480, 18 automatic channel select level (ichan, Page 16, address 50 – Cirrus Logic CS5480 User Manual
Page 49: 19 current channel minimum amplitude (p, Irms, Page 16, address 56, 20 no load threshold (load, Page 16, address 58
CS5480
DS980F3
49
6.6.18 Automatic Channel Select Level (Ichan
LEVEL
) – Page 16, Address 50
Default = 0x82 8F5C (1.02 or 2% minimum difference)
Sets the hysteresis level for automatic energy channel selection.
The channel select level register sets the hysteresis level for automatic energy channel selection. If the
most-positive value of P1
AVG
and P2
AVG
(I1
RMS
and I2
RMS
) is greater than Ichan
LEVEL
multiplied by the
least-positive value, and is also greater than Ichan
MIN
, the channel associated with the most-positive value
will be used. If not, the previous channel selection will remain.
The value in this register is an unsigned fixed-point value in the range of 0
value2.0, with the binary point
to the right of the MSB. A value of 1.0 or less indicates no hysteresis will be used.
6.6.19 Current Channel Minimum Amplitude (P
MIN
(IRMS
MIN
)) – Page 16, Address 56
Default = 0x00 624D (0.003)
Sets the minimum level for automatic energy channel selection.
The P
MIN
(IRMS
MIN
) register sets the minimum level for automatic energy channel selection. If the most-pos-
itive values of P1
AVG
(or I1
RMS
) register and P2
AVG
(or I2
RMS
) register is less than P
MIN
(IRMS
MIN
), the pre-
vious channel selection will remain in use.
It is a two's complement value in the range of -1.0
value1.0, with the binary point to the right of the MSB.
Negative values are not used.
6.6.20 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
value1.0, with the binary point to the right of the
MSB. Negative values are not 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
-(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