TMD3721 datasheet(19/89 Pages) OSRAM

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[v3-00] 2023-May-26

TMD3721 − Detailed Description

AWTIME defines the ALS repetition period. In non-synchronous

mode, the subsequent ALS cycle will begin at the end of the

AWTIME period. In synchronous mode, the subsequent ALS

cycle will occur on the first VSYNC after the end of the AWTIME

period, plus the delay defined by ASD.

PWTIME defines the proximity repetition period. In

non-synchronous mode, the subsequent proximity cycle will

begin at the end of the PWTIME period. In synchronous mode,

the subsequent proximity cycle will occur on the first VSYNC

after the end of the PWTIME period, plus the delay defined by

PSD.

Figure 19 shows the ALS and proximity timing during

concurrent mode.

In concurrent mode, it is important to configure ALS hold (CFG2

(0xA7), bit 3) correctly in order to avoid a situation where ALS

is constantly interrupted and cannot complete in a timely

manner. It is recommended to pause ALS only during the time

the emitter is pulsing (CFG2, bit 3=1). This may result in a slight

increase in ALS data noise, but the trade-off is a shorter pause

time.

Figure 19:

ALS and Proximity Measurement in Concurrent Mode

ALS

integ

ASD

AWTIME

ALS_Init_Time

Start s hifts

AVSYNC_EN=0

PSD

Prox

integ

Prox_Init_Time

Start s hifts

PVSYNC_EN=0

PSD

Prox

integ

Temp_Meas

(if en abled)

PWTIME

Start s hifts

PVSYNC_EN=0

Temp_Meas

(if en abled)

Prox_Init_Time

PWTIME

ASD

ALS

integ

ALS_Init_Time

Start s hifts

AVSYNC_EN=0

PSD

Prox

integ

Temp_Meas

(if en abled)

Start s hifts

PVSYNC_EN=0

Prox_Init_Time

PWTIME

ALS

hold

ALS

integ

ALS

hold

ALS

integ

PON=1

PEN=AEN=1

PWEN=AWEN=1

PVSYNC=1

AVSYNC=1

VSYNC

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