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AS3685C
Datasheet
7.3 Protection Functions
7.3.1 Overtemperature Protection
If the AS3685 junction temperature exceeds T OVTEMP , the current sink will be disabled and the charge pump
forced into 1:1 mode. If the junction temperature drops below T OVTEMP – T OVTEMPHYST, the device enables the
current sink again and the charge pump resumes normal operation.
7.3.1.1 LED Shortcircuit protection
If the LED is shorted (VCP to ILED), then depending on the set current and the resulting high power dissipation
inside the AS3685, the overtemperature protection will trigger. This protects the AS3685 and the system against
damage. If the AS3685 is in off-mode, then shorting of the diode will have no influence on the system.
Note: Do not short VCP to VSS if the supply is not current limited (e.g. by an internal protection inside the
battery), as there is an internal diode between VBAT (anode) and VCP (cathode).
7.3.2 Flash Timeout
The flash duration of a single flash is limited automatically to t FLASHTIMEOUT (applies only for ‘Flash’ mode(s)).
This protects the flash LED against thermal damage.
7.4 Layout Recommendations
To improve the heat dissipation, use a massive ground plane.
Figure 16 – AS3685 DFN10 3x3mm Layout Recommendation
Figure 17 – AS3685 WL-CSP 2x1.5mm Layout Recommendation
www.austriamicrosystems.com/AS3685
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