TMF8701 datasheet(49/66 Pages) AMSCO

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[v2-00] 2023-Feb-21

TMF8701 − Application Information

SPAD Options

Signal SPADs

Firmware can enable/disable SPADs in the array as needed.

Figure 113:

Signal SPADs

Physically there are 4x32=128 signal SPADs, but SPADs with too

high dark count rate are disabled during production test. There

are four TDCs (TDC1 …TDC4) connected to the output of the

SPADs. Each of the TDCs is connected to an array of 32 SPADs

(SPADs with too high dark count rate are disabled). In distance

mode the number of SPADs are reduced to typ. 40 SPADs to limit

the FOV of the TMF8701.

Reference SPADs

Figure 114:

Reference SPADs

Due to the high light intensity form the VCSEL which is located

very close to the reference SPADs and has no optical barrier like

the signal SPADs only highly attenuated SPADs are used.

Physically there are 12 reference SPADs, but SPADs with too high

dark count rate are disabled during production test. There is

one TDC (TDC0) connected to the output of the SPADs.

Min

Typ

Max

Comments

1x SPADS

10x Attenuated SPADs

100x Attenuated SPADs

Min

Typ

Max

Comments

100x Attenuated SPADs

Application Information

TMF8701 데이터시트(PDF) 49 Page - ams AG