TCS37073 datasheet(54/70 Pages) OSRAM

54 / 70 page

ams Datasheet, Confidential

Page 53

[v1-05] 2019-May-13

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TCS3707 − Register Overview

Proximity Data and Status

Proximity data is stored as a 14-bit value (two bytes). 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 × (16 / actual pulses)

PDATA is therefore proportional to the reflected energy per

pulse, independent of the number of pulses used.

PXAVG and PBSLN provide the most recent average PDATA and

a proximity baseline—the minimum average PDATA since the

last calibration. Execute calibration to initialize the proximity

baseline, and then the baseline can automatically provide the

lowest average PDATA measured if this feature is enabled.

Figure 63:

Proximity Data

Note(s):

1. If HXTALK_MODE is asserted, PDATA is 10-bit.

2. Return to the Register Map (0xA1, 0xA2).

Bits

Addr

Field

Description

7:0

0xA1

PDATA

Proximity Data

15:8

0xA2

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