SPI clock rate for the 6470/2

[scott pelger]

Posted on February 20, 2018 at 16:13

The data sheet for the 6470 (and 6472) is not clear regarding the SPI clock rate. what is your take on this? the reason why i ask is that a clock rate was selected, boards were built and deployed. all was well. new revision to the board by adding another motor and one of the preexisting motors experiences a random bridge b stall. by changing the SPI clock rate this problem went away.

i already have a help ticket out to ST and they are unable to answer this fundamental question about their own product which is why i am reaching out to other users.

-scott

[Kurtnelle]

What is the clock rate you are using? I generally don't push mine above 1Mhz. Stalling on the bridge could be traced to improper values being sent to the device (i.e. the pwm values are not what you thought) or EMI is leaking somewhere on the board.