The problem of the board powering on and off

cancel
Showing results for 
Search instead for 
Did you mean: 

The problem of the board powering on and off

221 Views
zhanghan
Contributor II

Hello,my board is designed by using chip MCIMX6Q5EYM10AD.i find that  When the board is powered up and down for about 200 times, the network port of the board will not  configured and work for several times.After many experiments, we find that this problem will no longer exist if  the software disables the uart debug port. The attached pictures are schematic diagrams of UART port and 100M network port. Besides,We have tested with an oscilloscope. When the board is powered off and on repeatedly, the RX signal of the UART will be interfered.  Although the uart function is forbidden to avoid this problem, the actual engineering application still needs this uart port for debugging.So can someone tell me what to do?

Labels (1)
Tags (1)
0 Kudos
1 Reply

118 Views
igorpadykov
NXP TechSupport
NXP TechSupport

Hi zhang

one can try to increase delay between on/off switching so board power circuits

were fully discharged. Also one can try to disconnect uart port from pc, as no

external voltages are allowed to be applied to unpowered processor according to

sect.4.2.1 Power-Up Sequence i.MX6DQ Datasheet

http://www.nxp.com/docs/en/data-sheet/IMX6DQCEC.pdf

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

0 Kudos