Usb power no DFU no reset - change to MCU 0.6?

rusefi / alphax-2chan

24 pin / 2 channel ECU

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Usb power no DFU no reset - change to MCU 0.6? #12

Closed rusefillc closed 2 years ago

rusefillc commented 2 years ago

20220112_161624

andreika-git commented 2 years ago

Current status: L101 should be populated, otherwise STM32 doesn't start. If L101 is populated, then TLS115 should NOT be populated

andreika-git commented 2 years ago

https://community.st.com/s/question/0D50X00009XkhxN/stm32f407vgt6-adc-pins-unused-vrefvrefvddavssa

mck1117 commented 2 years ago

That's a design mistake - the TLS115 shouldn't power 5VA. It should power things like the onboard pullups, but not any onboard sensors or logic. For example, right now if you short out the 5v sensor supply, it will incapacitate the STM32's oscillator!

mck1117 commented 2 years ago

I guess on this revision we will have to run without the TLS and with inductor installed.

andreika-git commented 2 years ago

One of the ways to use TLS115 on the rev.A is to cut the +5VA trace going to the input module, and have both L101 and TLS populated. In that case:

The external sensors will be powered from TLS115 and will be protected;
The STM32 analog core and the internal MAP sensor will be powered from the internal +5VA via L101;
The input module pullups will be powered internally (which affects only 2Step input);
Other pullups (CLT, IAT, CAM) will be powered from TLS115.

Also we have another option of cutting a different trace which gives us all pullups and the internal MAP sensor powered from TLS115:

rusefillc commented 2 years ago

Plan is to go with 504-PTSA080515V012 fuse for these five boards

andreika-git commented 2 years ago

done Now we're using mcu144-0.6