Why the VMOT pours under the chip?

hzeller / quadrigotion

TMC2660 Four stepper motor drivers on a stick.

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Why the VMOT pours under the chip? #3

Closed Duckle29 closed 6 years ago

Duckle29 commented 6 years ago

Hey there. I was wondering why VMOT had rectangular pours under the chip

It's not present in the example layout from trinamic, and I can't seem to find any info on the pins being use for cooling.

hzeller commented 6 years ago

Yes, this is meant as part of the cooling with the vias bolting together top and bottom transferring heat. More copper, even inner copper helps. The cooling requirements are described in 14.3 in the TMC2660 datasheet and also shown a little in the 14.5 sample layout (though they don't do a good job there)

Duckle29 commented 6 years ago

Okay good to hear, and thanks for the pointer to the section that mentions it :)