Using ER1211 ASIC as automatic exposure control circuit diagram

Published:2011/5/2 20:53:00 Author:Rebekka | Keyword: ASIC, automatic exposure control | From:SeekIC

The figure shows the diagram of using ER1211 ASIC as automatic exposure control circuit. ER1211 is the automatic exposure control ASIC in the automatic camera. The pin arrangement is shown in Figure (a), ① is the supply voltage monitoring, ② is the illumination monitoring, ③ is grounding, ④ is illumination warning output, ⑤ is relay drive output, ⑥ is exposure time delay device, ⑦ is exposure delay input, ⑧Automatic focus control, ⑨ is exposure control, ⑩ is power Vcc. When the shutter button is in the mode of half-pressed K2. If illumination environment light is lower than limit (V2 ≤ V6-0.2V), ④ pin outputs low level, low-light warning light LED light. Linkage with the flash K-selector switch is opened at the receiving position A, the corresponding C1 pass W, R1 to discharge, the exposure time (discharge time) is fixed, even if the flash automatic metering circuit does not work.



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