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Revision 0.7

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with additional features

with photosensor

AS3636

Preliminary Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n

Photosensor Detection circuit

The AS3636 supports an external photosensor to detect the reflected light from the Xenon flash. If the reflected light

reaches a configurable threshold, the flash pulse is stopped (IGBT_GATE=0). Figure 13 shows the application circuit.

Figure 13. Photosensor detection circuit

Figure 14 shows a typical waveform:

Figure 14. Photosensor detection waveform

The photosensor detection circuit is enabled by setting phsens_on=1 (this also disables the indicator LED fault detec-

tion ILF). Set Interrupt Mask Register=0 to disable the interrupt logic

power the photosensor and can be enabled by setting IND=1, ILP=1 and IND_LED_current=11b. The detection

10.The pin INT is re-used for the photo-sensor input.

 











 

 





 



 



 

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AS3636