iC-TW8 16-BIT SIN/COS INTERPOLATOR
Serial Configuration Mode
Jan 9, 2013 Page SC24/36
ternal quality monitoring; it may also be read direct-
ly from the VAR block in internal memory via the
serial ports (see Programmer’s Reference).
STATUS Pin Configuration
If neither the ADC quality monitor nor the adaption
quality monitor is used, the STATUS Pin Configu-
ration tab may be ignored in its entirety. If either of
the quality monitors is used, use the STATUS Pin
Configuration tab to set the polarity and mode of the
STATUS output (pin 19).
Adaption Quality Monitor
If Use Adaption Faults? = No in the FAULT Pin
Configuration tab, the Adaption Quality Monitor tab
can be ignored in its entirety. If Use Adaption
Faults? = Yes in the FAULT Pin Configuration tab,
use the Adaption Quality Monitor tab to enable or
disable the adaption quality monitor. If the adaption
quality monitor is not used, the remainder of the
Adaption Quality Monitor tab may be ignored.
The STATUS output is a pulse-width modulated
signal whose duty cycle is proportional to the out-
puts of the enabled quality monitors. PWM polarity
determines whether the duty cycle increases of de-
creases for an increasing value from the quality
monitors while PWM mode determines whether the
STATUS output response is linear or logarithmic.
Logarithmic mode is useful when driving an LED
from the STATUS output so that the intensity or
color is proportional to the PWM duty cycle. The
design tool graph shows the configured response.
If the adaption quality monitor is used, enter the de-
sired offset, gain match, and phase adaption quality
threshold levels. These levels are the cumulative
amount of adaption that is considered to be the
boundary between acceptable and marginal opera-
tion for the application. The design tool shows the
closest possible (actual) quality threshold levels and
the desired and actual fault levels from the FAULT
Pin Configuration tab.
LUT Configuration
The sensor distortion lookup table (LUT) can be
enabled or disabled in the LUT Configuration tab. If
the LUT is not used, the remainder of the LUT Con-
figuration tab may be ignored. See Using the LUT
on page 34 for information on configuring the LUT.
In operation, the iC-TW8 continuously calculates
the variable QM_ADAPT as
QM_ADAPT moffs moffc mgain mphase
CFG Block
The CFG Block tab shows the complete iC-TW8
configuration (as determined by the preceding tabs)
as stored in the CFG Block in internal memory (see
Programmer’s Reference). CFG Block register val-
ues are shown in decimal, hexadecimal, and binary
as a reference for troubleshooting.
where moffs, moffc, mgain, and mphase are values
between 0 (total adaption < adaption quality thresh-
old) and 255 (total adaption ≥ adaption quality
threshold) of the Sin channel offset, Cos channel
offset, gain match, and phase adaption quality moni-
tors respectively. Between the quality threshold lev-
el and the fault level, moffs, moffc, mgain, and
mphase are proportional to the total cumulative
amount of adaption of the respective parameter as
shown in the design tool graphs.
GUI Hex
The GUI Hex tab shows the complete iC-TW8 con-
figuration (as determined by the preceding tabs) in
the format used by the Graphical User Interface
software Hex Editor. After using the design tool to
configure the iC-TW8, type these values into the
corresponding address locations in the GUI Hex Ed-
itor tab to transfer the configuration to the actual
device.
QM_ADAPT is the sum of these four values and
thus indicates the relative quality (amount) of pa-
rameter adaption. QM_ADAPT is a component of
the PWM signal that drives the STATUS output (pin
19) for external quality monitoring; it may also be
read directly from the VAR block in internal
memory via the serial ports (see Programmer’s Ref-
erence). When QM_ADAPT reaches 255, an adap-
tion fault is activated.
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