AMS TMD2636 EVM Manual do utilizador - Página 12
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The PWTIME control sets the time to wait between prox cycles. PWTIME can be adjusted in 2.778 ms
steps.
The PWLONG checkbox controls the PWTIME factor. When this box is checked, the wait time
between proximity cycles increases by a factor of 12x.
The PDSELECT selects the photodiode to use for proximity detection. The values are "No
photodiode", "Far photodiode", "Near Photodiode", and "Both photodiode".
The POFFSET controls shift PDATA to remove crosstalk from the proximity data. The values range
from -255 to 255. This value can be set manually, or it can be set by the Proximity offset calibration.
The Auto Offset Adjust checkbox enables the function that automatically decrements the POFFSET
value any time the PDATA value is 0. When this function is active, manual changes to the POFFSET
control are disabled, and the program will read and update the POFFSET value each time it reads the
PDATA value.
The Calibration Group box.
●
The Cal button triggers the sensor's proximity offset calibration sequence. This function
automatically selects a POFFSET to remove crosstalk from PDATA.
●
The Average checkbox enables proximity hardware averaging as selected with PROX_AVG
during calibration when checked.
●
The PRATE checkbox enables PRATE during calibration. It is useful when averaging is
enabled.
The APC function can be turned off with the Disable checkbox. This feature is used for hardware
configurations with high crosstalk. When Auto Pulse Control is disabled, the range of the PDATA value
is 0-1023. When the Disable checkbox is unchecked, the range of the PDATA value is 0-65535.
The PROX_AVG control defines the number of ADC samples collected and hardware averaged during
a proximity cycle.
PRATE controls sets the duration of a single proximity sample. The time is equal to (PRATE + 1) *
88 μs. The time, in microseconds, is displayed immediately under this control.
4.7.2
Prox Output Data
The top right corner of the Prox tab displays the output data. This data is continuously read. The
polling interval is shown above the tab.
●
PDATA displays the Proximity ADC channel data counts.
●
ProxAvg displays the proximity data after software average of the last 32 PDATA.
●
StDev displays the calculated standard deviation of the last 32 PDATA samples displayed on
the screen
Eval Kit Manual • PUBLIC
UG001002 • v1-00 • 2021-Jan-18
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