Automatic exposure controller circuit using ER1211 ASIC

Published:2011/10/20 21:06:00 Author:Rebekka | Keyword: Automatic exposure controller , ASIC | From:SeekIC

ER1211 is the automatic exposure controlling 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 driving output, ⑥ is exposure time delay device, ⑦ is exposure delay input, ⑧Automatic focus control, ⑨ is exposure control, ⑩ is power Vcc. If illumination environment light is lower than limit (V2 ≤ V6-0.2V), ④ pin outputs low level, low-light warning light LED emits light. Linkage with the flash K-selector switch is opened at the receiving position A, the corresponding C1 passes W, R1 discharges, the exposure time (discharge time) is fixed, even if the flash automatic metering circuit does not work.



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