TCS3701 datasheet(52/67 Pages) OSRAM

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Datasheet, Public

Page 51

[v2-00] 2022-Dec-15

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TCS3701 − Register Overview

Note(s):

1. Return to the Register Map (0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F, 0xA0).

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 60:

Proximity Data

Note(s):

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

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

7:0

0x9D

ADATA4

ALS Channel Four Data. WIDEBAND data.

15:8

0x9E

7:0

0x9F

ADATA5

ALS Channel Five Data.

15:8

0xA0

Bits

Addr

Field

Description

7:0

0xA1

PDATA

Proximity Data.

15:8

0xA2

Bits

Addr

Field

Description

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