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TMD4903 데이터시트(PDF) 36 Page - OSRAM GmbH

부품명 TMD4903
상세설명  Color and Proximity Sensor Module with mobeam™ Barcode Emulation and IR Remote Control
PDF  86 Pages
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제조업체  OSRAM [OSRAM GmbH]
홈페이지  http://www.osram.com
Logo OSRAM - OSRAM GmbH

TMD4903 데이터시트(HTML) 36 Page - OSRAM GmbH

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Datasheet, Public
Page 35
[v2-00] 2022-Nov-03
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TMD4903 − Register Description
Proximity Data Registers (0x9C – 0x9D)
Proximity data is stored as a 14-bit value (two bytes). PDATA has
a two-byte latch like 16-bit fields. Reading the low byte first
latches the high byte.
Proximity detection uses an Automatic Pulse Control (APC)
mechanism that adjusts the number of pulses per measurement
based on the magnitude of the reflected IR signal. As the
magnitude of the signal increases, the number of pulses
decreases. Proximity detection uses a 10-bit ADC that is
extended to a 14-bit dynamic range for PDATA using the
following formula:
PDATA = ADCvalue x (16 / proximity pulses)
PDATA is the average response of the non-masked proximity
photodiodes. If one or more photodiodes are masked
(CFG2 register 0x9F), the proximity response will remain the
same since it is an average of the active photodiodes. PDATA is
therefore proportional to the reflected energy per pulse,
independent of the number of pulses used.
Figure 41:
Proximity Data Register
Field
Register
Bits
Description
PDATA
0x9C
7:0
Proximity data low byte
0x9D
13:8
Proximity data high byte



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