Arduino Due Brown Out

Other Hardware 3rd Party Boards
1

I am designing an Arduino Due clone with ATSAM3X8E. I have removed the ATMEGA16U2 programmer, 5V and 3.3V regulators, JTAG header and resistors.

When I power my PCB with 3.3V regulated power, the L and ON LEDs lit up for a second and then went off, then my power supply voltage (3.3V with about 500mA) began to drop and the current consumption went up high as if there is short circuit.

There is no obvious short circuit on the PCB, as if there is, the LEDs will not light up at all. Have anyone seen this kind of error and what could possibly wrong with my PCB?

Thanks.

2

No schematic + no board layout + no code = no useful answers for you.

If you want speculation, that we can do. Probably a bad power supply.

3

JLLL:
There is no obvious short circuit on the PCB, as if there is, the LEDs will not light up at all. Have anyone seen this kind of error and what could possibly wrong with my PCB?

That is not necessarily true, since a power supply that has over temp shutdown will take a finite time to heat up.

Logic suggests that you have an insufficient power supply or a low resistance path between + and - somewhere, if not a dead short.

Are you saying you took an actual Due and removed components, or have you built a new board?

4

Thanks.

I found the problem.

My pcb manufacturer soldered all the tantalum capacitor with the wrong polarity!