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TMG49037 bảng dữ liệu(PDF) 39 Page - ams AG

tên linh kiện TMG49037
Giải thích chi tiết về linh kiện  Gesture, Color and Proximity Sensor Module with mobeam Barcode Emulation and IR Remote Control
PDF  104 Pages
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nhà sản xuất  AMSCO [ams AG]
Trang chủ  http://www.ams.com
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TMG49037 bảng dữ liệu(HTML) 39 Page - ams AG

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Page 39
[v1-02] 2015-May-14
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TMG4903 − Register Description
Proximity Data Registers (0x9C – 0x9D)
Proximity data is stored as a 14-bit value (two bytes).
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 43:
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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