www.austriamicrosystems.com/AS3644

1.2.2

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AS3644

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

Figure 17. Internal circuit of 4MHz/1Mhz selection

External Strobe Input

To start the flash operation by an hardware input using an external strobe input, use schematic shown in Figure 18:

Figure 18. External strobe input

To enable this function, program the flash timer with the exact flash duration (by programming flash_timer) and set

external_strobe=1. The AS3644 waits for an external strobe signal on pin LED_OUT and starts the flash pulse with a

duration defined by flash_timer.

Protection and Fault Detection Functions

The protection functions protect the AS3644 and the LED(s) against physical damage. In most cases a register bit is

set, which can be readout with the interface. The fault bits are cleared

1. Except overtemperature protection bit fault_overtemp: This bit can be cleared once the temperature drops



 







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