ZL70550 Application Development Kit (ADK) User’s Guide
Revisio n 1
16
The
CCA & Cal
tab has three subsections, for clear channel assessment, calibration, and
manual trims.
•
Clear Chan Assessment
:
−
RSSI Read
: When the
R
button is pressed, an RSSI reading is performed on the
current channel. Eight samples are taken for the
RSSI
result — both the average
(
Ave
) and the maximum (
Max)
values — are displayed.
Note:
The following calibrations are performed for each channel before the RSSI
reading is taken; these are trims that need to be done for a change in
frequency: VCO calibrations (PA off, PA on, RX, and amplitude), peak
detector trim, LNA load tune, and antenna tune.
•
Calibration
: Various calibrations can be performed on demand, or the current
register settings may be read for all calibrations. Pressing the
Rd
(read) button allows
the user to view the current register settings for all automatically calibrated registers
(i.e., those calibrations that are listed underneath the
Rd
and
Cal All
buttons) and for
the manual trims. Pressing the
Cal All
button performs only a subset of the listed
calibrations — including VCO calibrations (PA off, PA on, RX, and amplitude), peak
detector trim, LNA load tune, and antenna tune — and displays the results of their
respective registers. Alternatively, the
C
button next to any individual calibration can
be used to initiate that specific calibration function by itself or the
FULL
button can be
used to initiate only the four VCO calibrations (PA off, PA on, RX, and amplitude).
The user can also manipulate the trim registers by entering a value in the appropriate
field and then pressing the
W
button. The user can read the value for a trim register
by pressing the
R
button for the trim register of interest. Values are in decimal format.
Refer to the
ZL70550 Programmer User’s Guide
for a description of the calibrations.
•
Manual Trims
:
Manual Trims
are registers that can be set manually and for which
there is no automatic calibration function in the GUI. The
W
or
R
buttons in the
Manual Trims
group can be used to manually manipulate or to read (respectively) the
registers XO_TRIM, GAUS_TRIM, LNA_BIAS_TRIM, RSSI_THRESH,
CSMA_THRESH, and RSSI_TRIM. For a description of these registers and
associated trims, please refer to the
ZL70550 Programmer User’s Guide
.
