TMG4903 datasheet(39/104 Pages) AMSCO

No de pièce	TMG4903

Description	Gesture, Color and Proximity Sensor Module with mobeam Barcode Emulation and IR Remote Control

PDF	104 Pages

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Fabricant	AMSCO [ams AG]

Site Internet	http://www.ams.com

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39 / 104 page

ams Datasheet

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

Bits

Description

PDATA

0x9C

7:0

Proximity data low byte

0x9D

13:8

Proximity data high byte

TMG4903 Fiches technique(PDF) 39 Page - ams AG