CDB5490U
22
DS923DB5
2.5.1.8
Phase Compensation
The
Phase Comp Register
section is used to make changes to and display the contents of the CS5490's
PC
(Phase Compensation Control) register. The
PC
register allows coarse- and fine-phase adjustment
on each channel of the CS5490 data path. Refer to the CS5490 data sheet for descriptions of the
PC
reg-
ister bits.
2.5.1.9
Integrator Gain, System Gain
The
Integrator Gain
and
System Gain
sections display the signal path gain in both hexadecimal and dec-
imal format. Each register can be modified by typing a value in the corresponding
Decimal
or
HEX
field.
2.5.1.10
Sample Count, Cycle Count, Settle Time
The
Sample Count Register
,
Cycle Count Register
, and
Settle Time
sections provide fields to display the
values of registers associated with low-rate calculations. The
SampleCount
and
CycleCount
registers are
entered or displayed in decimal format by default. The user may select to enter or view other number for-
mats of the register by selecting the "d" within the field. The value of the
T
Settle
register is displayed in both
hexadecimal and decimal format. Each register can be modified by typing a value in the corresponding
field.
2.5.1.11
ZX
NUM
When Automatic Frequency Update is enabled, the
ZX
NUM
section is used to adjust the number of zero
crossings used in the Epsilon calculation. The update rate of
Epsilon
is increased by reducing the zero
crossings. The register can be modified by typing the number of zero crossings.
2.5.1.12
Epsilon
The
Epsilon
section is used to display and adjust the
Epsilon
register (the ratio of the AC line frequency
to the output word rate). The
Epsilon
register can be updated either through entering the AC line frequen-
cy in the
Line Freq
field or by entering the direct register value in the
HEX
field.
2.5.1.13
Mask Register
The
Mask Register
box displays the value for the
Mask
register in hexadecimal format and decodes them
to indicate each bit's function. The
Mask
register can be modified by typing a value in the
HEX
field, or by
checking the appropriate boxes for the bits that are to be masked. The value present in the
Mask
register
may be changed by the GUI software during certain operations to provide correct functionality of the
CDB5490U board.
2.5.1.14
Temperature Registers
The
Temperature Registers
box is used to adjust the temperature offset register (
T
OFF
) and temperature
gain register (
T
GAIN
) to convert the temperature register (
T
) from the Celsius scale to the Fahrenheit scale
or vice versa and to improve temperature measurement accuracy. Refer to the CS5490 data sheet for
details of the on-chip temperature sensor.
2.5.1.15
Zero-crossing Level and No Load Threshold
The
Zero-crossing Level
and
No Load Threshold
boxes display the values for these registers in hexadec-
imal and decimal. Each register can be modified by typing a value in the corresponding
Decimal
or
HEX
field.
