Test Parameter Lower Limit Upper Limit
Offset Count (no gray card) 1900 3100
Offset Count (with gray card) 2050 3500
Upper threshold 2300 3750
Lower threshold 2250 3700
4.14
Captouch Button Calibration
If there is a severe loss in degradation, calibrate the threshold according to the documented
percentage value of the detection.
Procedure:
1 Place radio on a flat surface area.
2 Start timer.
3 Execute TetraCom command CAP_TOUCH READ REG_DIFFERENCE_COUNT_SENSOR0 to read
different count repeatedly when the stylus moves close to touch the corresponding navigation
button.
The command used in step 3 uses the Up button as the example (Up = SENSOR0).
NOTICE: Ensure that the stylus touches the center of the capacitive touch button.
4 Take note of the timer reading when a value is observed (different count not 0). Continue
recording the different count reading for ten samples and calculate the average reading.
5 Write the threshold setting for the button referencing to the percentage of the average different
count value into the buffer using these commands.
CAP_TOUCH WRITE USER_TUNE_REG_BASE_THRESHOLD0 xx
CAP_TOUCH WRITE FACTORY_TUNE_REG_BASE_THRESHOLD0 xx
NOTICE: First command initiates write buffer to store into the user codeplug, and second
command stores as a backup tuning data. xx is the value to write into.
Threshold setting:
• Up: 65 %
• Down: 67 %
• Back: 68 %
• OK: 70 %
Software returns OK upon successful execution.
6 Remove stylus from button when the timer hits 5 seconds relative to the time noted in step 4 of
the observed different count value.
NOTICE: Different count read within 5 seconds relative timing.
7 Repeat step 3 to step 6 for different button.
Sensor button referencing:
• Up: SENSOR0
• Down: SENSOR6
MN002952A01-AH
Chapter 4: Test Setup and Testing
62
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