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?Resettable Fuses? What rating is appropriate for the Cerb40?


#1

I’m creating a board that will use a Cerb40 at it’s heart. Power will come from an external 3.3V source. Since I won’t be doing the actual installs of the device, I’d like to incorporate some protection in the design. I was considering a resettable fuse, but I don’t really know what specs the fuse should be. I am only powering the Cerb40 and an additional indicator LED. For simplicity’s sake, assume the Cerb40 will be sourcing on 16 pins up to the max.


#2

STM32F4 manual would be the best reference for these kind of things.


#3

Thanks, Gus. I’ve never seen the reference manual, only the datasheet, and determining this from the datasheet seemed a daunting task. BTW, the links on http://wiki.tinyclr.com/index.php?title=Cerb-Family for the datasheet and reference manual were broken. I’ve found the new URLs and updated the wiki.

Update
Someone may answer this question before I can, given the time it’s taking to download the reference manual!


#4

Looking at the datasheet (reference manual doesn’t seem to give these specs), it looks like I’ll be using ~120mA, give or take a few small peripherals worth. Most peripherals use less than 1mA. Note that I am not using Ethernet, USB, or DMA, which use approximately 3mA to 6mA, so if you are using any of those, your consumption will very a significant amount from mine. ADC uses ~2mA, btw.