TMD3721 datasheet(17/89 Pages) AMSCO

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[v3-00] 2023-May-26

TMD3721 − Detailed Description

When ALS and proximity measurements are both enabled, there

are three operating modes available in the device: sequential

mode, full parallel mode and concurrent mode.

In the “sequential” operating mode, ALS and proximity

measurements run sequentially. When the device is operating

non-synchronously, the ALS measurement starts after ALS

enabled, and the proximity measurement starts after the

completion of ALS measurement. 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 the first VSYNC after the

completion of ALS measurement until the proximity

measurement begins.

AWTIME defines the ALS and proximity repetition period. In

non-synchronous mode, the subsequent measurement cycle

will begin at the end of the AWTIME period. In synchronous

mode, the subsequent measurement cycle will occur on the first

VSYNC after the end of the AWTIME period, plus the delay

defined by ASD. PWTIME in the sequential mode is ignored.

Figure 17 shows the ALS and proximity timing during

sequential mode.

Figure 17:

ALS and Proximity Measurement in Sequential Mode

In the “full parallel” operating mode, ALS and proximity

measurements run completely independent of each other.

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.

ALS

integ

ASD

AWTIME

Prox

integ

PSD

ASD

ALS_Init_Time

Prox_Init_Time

Start s hifts

AVSYNC_EN=0

Start s hifts

AVSYNC_EN=0

Start s hifts

PVSYNC_EN=0

Temp_Meas

(if enabled)

ALS

integ

AWTIME

PON=1

PEN=AEN=1

PWEN=AWEN=1

PVSYNC=1

AVSYNC=1

VSYNC

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