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[HW] Direct connect between Ports of STM32s?

gds23
Associate II
Posted on July 13, 2011 at 05:51

If two STM32 devices are wired together in a system, is it necessary to place fairly small series resistors between the port connection to limit the current in case a port or ports somehow starts driving current to the other processor and possibly degrades or destroys it? This is not a big problem to do except that the series resistance somewhat reduces the maximum SPI baudrate between the STM32 parts, e.g., can go 18Mbps w/o resistors but only 9Mbps works with the resistors on the SPI signals.

1 REPLY 1
Andrew Neil
Evangelist III
Posted on July 13, 2011 at 07:59

''If two STM32 devices are wired together in a system, is it necessary to place fairly small series resistors between the port connection''

 

No, it's not necessary.

''in case a port or ports somehow starts driving current to the other processor''

 

 

Just be careful to ensure that doesn't happen!