Dear team,
I recommended below schematic for dimming function but there is issue on this concept. Please refer to the below phenomenon and condition. I think 7 LEDs(RED box of below cluster picture) have to remain OFF status(currently half ON status) although changing Emitter signal because of no input signal.
Next week, the customer have to order PCB for approval working sample. This is urgent issue. I am sorry to bother you but please review and let me know your feedback ASAP. How can I solve this issue?
<Schematic concept>
<Abnormal phenomenon>
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There is no input signal of ULQ2003A-Q1(1B~7B : Low) but LED output in ON(red box, half ON not fully ON)
<Condition>
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There is no input signal of ULQ2003A-Q1(1B~7B : Low)
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Yellow signal : MCU dimming signal
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Green signal : Port8 (E, emitter signal)
If you need more information, please let me know.
Thank you.