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Published on 2006-12-30 11:35 Only look at the author

Typical circuit diagram of serial port power stealing [Copy link]

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kaikai, how are you? ??? ??? ??? ??? ??? ??? ??? ??? ??? / Details Published on 2008-5-8 16:40

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Published on 2008-5-8 16:40 Only look at the author

kaikai, how are you? ??? ??? ??? ??? ??? ??? ??? ??? ??? /

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Friendlyarm mini2440 development board cannot be turned on. After power on, the LCD screen is white and there is no output on the serial port. Please check with DX
[i=s]Thispostwaslasteditedbytianyou121on2024-8-1622:54[/i]FriendlyArmmini2440developmentboardcannotbeturnedon.Afterpoweron,theLCDscreeniswhiteandthereisnooutputontheserialport(whitescreenwhenturnedon,nooutputontheserialport)AftertheMini2440 ...
The two boards are connected via serial ports. After power-on, the voltage of one of the boards is incorrect, and it is only 3.68v. Why is this?
Whenthescreenisnotconnected,theoutputvoltageofthetwoboardsis4Whenmyscreenisconnected,thevoltageisonly3Whatisthereason?Iconnectthetwoboardsthroughtheserialporttocommunicate
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