AnsweredAssumed Answered

Fail to make own STM32 board

Question asked by binugroho.eko_henfri on Aug 23, 2011
Latest reply on Jan 18, 2012 by bil.til
Dear all,

Sorry, I am a newbie on STM32 microcontroller.

Yesterday I have made my own STM32F103RBT6 board. I use L1117-3.3 as my 3,3 volt regulator. The external components are Crystalls, capacitors for crystall, supply capacitors, reset circuit (using R and C), and resistor pull down for boot 0 and boot 1 pin.

When I apply 5 volt voltage to the regulator, firstly its is OK it only draws current about 4mA. But several second after that the current increase over 200mA. and then I check the VDD and VSS has been short Circuit. And the chip has been damaged.
Thus I remove the chip and measure the VDD-VSS voltage, and it is 3.3volt. I've recheck my PCB, and I can't found any mistakes. 

I've already burn 5 chips last night, and I don not know whats wrong with the circuit.

If the there any suggestions  for my problem will be very appreciated.

Thank for advance.

Best Regard,
Eko Henfri.