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AS3685A-ZDFT-2Y80 Datasheet(PDF) 10 Page - ams AG |
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AS3685A-ZDFT-2Y80 Datasheet(HTML) 10 Page - ams AG |
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10 / 25 page  AS3685A/AS3685B Datasheet www.austriamicrosystems.com/ AS3685 (ptr) Revision 2.2 9 - 24 7.1.2 Soft Start The soft start mechanism reduces the inrush current. Battery current is smoothed when switching the charge pump on and also at each switching condition. This precaution reduces electromagnetic radiation significantly. 7.2 Current Source (Sink) The AS3685 operates in three different modes: Indicator Mode: A small (average) current is used to obtain an indication function with the flash LED (e.g. indication for camera operation) Torch Mode: A moderate current of e.g. 150mA allows the use of the flash LED as a torch or video light Flash Mode: A high current of e.g. 700mA (up to 1000mA) is set for a high brightness flash. Only in this mode, the flash timeout timer limits the total flash time. Pulsed Indicator Mode (only AS3685A): The control device sends a short sequence to the AS3685A and the AS3685A enables the flash LED for a defined fixed duration (torch current setting). This duration is controlled by the AS3685A and the control device does not need to start an internal timer function. The current through the LED and the operating mode is controlled by the two digital pins EN1 and EN2. There are two versions of the AS3685 available: AS3685A and AS3685B. The only difference between these versions is the digital interface as shown below: 7.2.1 AS3685A Current Setting For the AS3685A, the operating mode and the current through the LED is defined by the following table: Table 7 – AS3685A Current Settings ILED for RISET = EN1 EN2 Mode 14.2kΩ 10kΩ Percent of Full Scale ILED/IISET 0 0 Off 0mA 0mA 0% 0 (Off) 1 0 Indicator 4.7mA average (=150mA with 1/32 duty cycle 1)) 6.7mA average (=214mA with 1/32 duty cycle 1)) 0.67% (=21.4% / 32) 52.2 (=ITORCH2ISET/32) 0 1 Torch 150mA 214mA 21.4% 1639 (=ITORCH2ISET) 1 1 Flash 700mA 1000mA 100% 7650 (=IFLASH2ISET) Notes: 1) The on-time for indicator mode is 1μs, off time 31μs (32μs = 32.25kHz) Where IISET is: I ISET V ISET R ISET 1.3 V R ISET |
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