AnsweredAssumed Answered

Check if a uC is alive or dead

Question asked by Ferreira on Apr 11, 2012
Latest reply on Apr 17, 2012 by Ferreira
I wonder if someone could help me.

I recently have developed my own PCB board. I've soldered all the components, and now I want to starting downloading some firmware to the uC (STM32F407ZG - LQFP144pin).

For my surprise I can't connect my programmer to the uC via JTAG. I've contact my programer/ IDE supplier and after some check procedure we concluded that the programmer is OK and that it can't connect with my uC.

I've double checked all connections, and power supply. Everything seems to be OK. I have analysed the board and the schematic, and the power supply pins and, JTAG pins are well connected.
I've also measured 1.29V on the VCAP1 and VCAP2 pin.

But I can't comunicate with the device.

At this time, I would like to check if the uC is dead or alive, but I don't know how to procedure.

Do someone know if there is some pins where I can read a signal to check if the device is alive? I thought that the VCAP pin could be a start, but even with the 1.29V the device don't communicate with the programmer.

I've also turned the boot0 On and OFF (to enter in system memory). But the device don't react.

I've also turned the PDR_ON pin ON and OFF. And the device don't react.

Thank you all,

Best regards,

A.Paiva

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