AMS TMD2620 Podręcznik użytkownika - Strona 11

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AMS TMD2620 Podręcznik użytkownika
The PLDRIVE control sets the drive strength of the IR LED current. Values are approximate; actual
current through LED is factory trimmed to normalize IR intensity. The values range from 0 (6mA
LED Current) to 31 (192mA LED Current).
The WEN checkbox enables the wait time between proximity cycles. The WTIME control sets the
duration of the wait time using the formulas in Table 1. When WLONG is checked the wait time is
multiplied by 12.
Table 1. Wait Time Formulas
WLONG
Wait time (ms)
Unchecked
(WTIME + 1) * 2.778ms
Checked
(WTIME + 1) * 2.778ms * 12
The HW Prox Averaging control is a pulldown menu that lets you defines the number of ADC
samples collected and averaged during a cycle, which become the proximity result. The averaging
is calculated in the hardware. The values range from 0 (Disabled) to 7 (128 samples) where each
value is the exponent of 2 (2
The PRATE control sets the duration of 1 Prox Sample, which is (PRATE + 1) * 87µs. The Prox
Cycle Time is the duration to output the HW averaging data, which is the PRATE time multiplied by
the HW Prox averaging number.
The POFFSET control sets the magnitude that adjusts PDATA to remove crosstalk from the
proximity data. The values range from -255 to 255.
The Cal button triggers the sensor's proximity offset calibration sequence.
The Auto Offset Adjust checkbox causes the POFFSET value to be decremented if PDATA ever
becomes zero.
The Prox Threshold controls the high and low thresholds values. If the PDATA value is above the
high threshold or below the low threshold the proximity interrupt is asserted (PINT).
The PPERS control set the persistence interrupt filter. The interrupt (PINT) asserts when PDATA
crosses a threshold for consecutive PPERS number of reads. Example: if PPERS is set to 3, then
PINT asserts when PDATA crosses a threshold and stays past the threshold for 3 consecutive
reads.
The Dynamic checkbox moves the high and low thresholds when PINT is triggered. PINT is cleared
automatically.
value
).
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