TMD3721 datasheet(18/89 Pages) OSRAM

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Datasheet, Public

Page 17

[v3-00] 2023-May-26

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TMD3721 − Detailed Description

• For proximity, PVSYNC_EN=1 enables synchronous mode

and PSD defines the delay from VSYNC until the proximity

measurement begins.

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 18 shows the ALS and proximity timing during full

parallel mode.

Figure 18:

ALS and Proximity Measurement in Full Parallel Mode

In the “concurrent” operating mode, ALS and proximity

measurements run at the same time, with the ALS measurement

“paused” while the proximity measurement is running. When

the device is operating non-synchronously, the ALS and

proximity measurements start after AEN=PEN=PON=1. When

the device is operating synchronously (i.e. the ALS and

proximity measurements are triggered by an external VSYNC

signal) the ALS and proximity start timing is determined by the

following:

• For ALS, AVSYNC_EN=1 enables synchronous mode and

ASD defines the delay from VSYNC until the ALS

measurement begins.

• For proximity, PVSYNC_EN=1 enables synchronous mode

and PSD defines the delay from VSYNC until the proximity

measurement begins.

ALS

integ

ASD

AWTIME

ALS_Init_Time

Start s hifts

AVSYNC_EN=0

PSD

Prox

integ

Temp_Meas

(if en abled)

PWTIME

Prox_Init_Time

ALS

integ

ASD

ALS_Init_Time

PSD

Prox

integ

Temp_Meas

(if en abled)

Prox_Init_Time

PSD

Prox

integ

Temp_Meas

(if en abled)

Prox_Init_Time

Start s hifts

AVSYNC_EN=0

AWTIME

Start s hifts

PVSYNC_EN=0

Start s hifts

PVSYNC_EN=0

PWTIME

Start s hifts

PVSYNC_EN=0

PON=1

PEN=AEN=1

PWEN=AWEN=1

PVSYNC=1

AVSYNC=1

VSYNC

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