Is the STLINK/V2 ''NRST'' pin open-drain ?

[lemke.a.w]

Posted on February 06, 2018 at 13:47

Hello,

I'm starting a new project with the STM32F746 and I would like to know if I can connect the STLINK/V2 �NRST� output pin (pin 15) directly to a switch, with one of the terminals grounded or directly to a microprocessor supervisory circuit, like the ADM6713.

What is the minimum resistance value that I can put like pull-up, in the NRST signal originated from STLINK/V2?

Thanks!

#stm32f7 #stlinkv2(v2) #jtag

[Uwe Bonnes]

Posted on February 06, 2018 at 14:01

If you look at the nucleo/dico boards schematics, the black buttom shorts NRST to ground.

The Stlink NRST output however also shorts NRST from the target to ground when the stlink is unpowered. It is a pity that a non 5-volt tolerant pin has been choosen...