SAM3U4E - Power on reset FAILED!!

Discussion around product based on ARM Cortex M3 core.

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Joined: Mon Oct 13, 2014 9:55 am

SAM3U4E - Power on reset FAILED!!

Tue Oct 14, 2014 1:42 am

There is a SAM3U4E on my board. Main voltage is 3.3V. 

I can download and debug code over J-Link. 
The problem is that MCU does not start after power on until I assert low to NRSTB(pin 141).

I checked the VDDOUT (pin 2). 
The voltage level of VDDOUT was about 2.2V after power on. 
After I asserted low to NRSTB(pin 141), the voltage level changes to 1.8V and software started.

Please let me know any clue to solve this problem
Posts: 29
Joined: Sat Nov 26, 2011 10:20 am

Re: SAM3U4E - Power on reset FAILED!!

Wed Oct 15, 2014 11:38 pm

I have exactly the same problem.
Please post ur solution if you reached something.

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