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SIM900 VDD voltage drop

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happy_davood

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Hi dears,
I have sim900 connected to Atmega64 . Everything is OK but some time sim900 turns off. I measured the VDD_Ext Pin it is 800mv instead of 2.9 volt. I am sure that power supply is OK and there is no voltage drop (because i measured by oscilloscope) . The power supply is 12 Volt regulated by LM2576 with 3A output current.

tanx
 

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