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AS3685A Datasheet(PDF) 13 Page - ams AG |
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AS3685A Datasheet(HTML) 13 Page - ams AG |
13 / 25 page AS3685A/AS3685B Datasheet www.austriamicrosystems.com/ AS3685 (ptr) Revision 2.2 12 - 24 7.2.2 AS3685B Current Setting The current through the LED (ILED) can be set in several steps using the following waveforms: Figure 16 – AS3685B Current Setting Method A For method A, the current is started after a certain time after the first rising edge of EN1. The AS3685B chooses method A, if EN1 is high at the first rising edge of EN2. Figure 17 – AS3685B Current Setting Method B For method B, the current is started after the second rising edge of EN2. The AS3685B chooses method B, if EN1 is low at the first rising edge of EN2. Any high or low level duration for EN1 or EN2 should not be shorter than tPULSEWIDTH. The actual number of pulses on the pin EN1 (applies for methods A and B) define the mode and the current settings for the AS3685B: Table 9 – AS3685B Current Settings H-L-H Pulses on EN1 Mode ILED (for RISET = 14.2kΩ) ILED (for RISET = 10kΩ) ILED/IISET EN1=EN2=0 Off 0mA 0% 0 (Off) 0 1 Indicator 4.7mA average (=150mA with 1/32 duty cycle 1) ) 6.7mA (=214mA with 1/32 duty cycle 1)) 52.2 (=ITORCH2ISET/32) 2 41mA 60mA 448 3 85mA 120mA 929 4 129mA 180mA 1410 5 Torch 173mA 250mA 1891 6 Flash 217mA 310mA 2371 EN2 EN1 Set current with number of pulses off off Flash/Strobe/Indicatior function dependent on number of pulses ILED t typ. 64µs Current can be increased if required Define Method A min. tPULSEWIDTH EN2 EN1 Set current with number of pulses off off Flash/Strobe/Indicatior function dependent on number of pulses ILED t typ. 64µs Current can be increased if required no time limit Define Method B min tPULSEWIDTH |
Similar Part No. - AS3685A_11 |
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Similar Description - AS3685A_11 |
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