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1.5-4

18 - 37

AS3647/47B

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

Figure 22. Low Voltage current Reduction Waveform with diagnostic-Flash and Main-Flash Phase

If the diagnostic flash should be short (e.g. 10ms) it is recommended to operate this diagnostic flash at slightly higher

vin_low_v_run setting compared to the main flash as shown in Figure 23:

Figure 23. Low Voltage current Reduction Waveform with short diagnostic-Flash and Main-Flash Phase

The different settings for vin_low_v_run allow a constant main flash current without dropping VIN below vin_low_v_run.

Flash Strobe Timings

The flash timing are defined as follows:

1. Flash duration defined by register flash_timeout and flash is started immediately when this mode is selected by

the I

set strobe_on = 0, start the flash by setting out_on = 1

2. Flash duration defined by register flash_timeout and flash started with a rising edge on pin STROBE (see Fig-

ure 25):

set strobe_on = 1 and strobe_type = 0

3. Flash start and timing defined by the pin STROBE; the flash duration is limited by the timeout timer defined by

set strobe_on = 1 and strobe_type = 1







 

 

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