TF536 Rev2 Gets Hot

[PaulJ_2.0]

I've put together 15 rev2 boards now and they all get to the point where the CPLD is hot to touch, whereas the rev1 board I have stays quite cool.

Is there a reason the rev2 runs significantly hotter?

[terriblefire]

I've put together 15 rev2 boards now and they all get to the point where the CPLD is hot to touch, whereas the rev1 board I have stays quite cool.

Is there a reason the rev2 runs significantly hotter?

Try the same rev2 firmware in the rev1 .. it will get hot. There is a pin floating but i cant figure out which one and disabling floating breaks it for alenppc.

[supaduper]

Just buy some raspberry pi heat sinks 14mm or 15mm square, they work great on the TF360 CPLDS to dissipate the heat

[matt020]

OOooooh, is this something thats gunna cause us people in hot climates some headaches? Australia's summer can sit in the 30's no probs....

[terriblefire]

Rev 1 and rev2 are the same apart from bus buffers, 3 pull ups and 2 pins swapped. I can give out a version that has keeper set that probably will run cold. But none of mine are too hot to touch.

[terriblefire]

@PaulJ_2.0 try out all of these and see if any of them work and stay cold.

tf536r2_2020_06_22_alpha_keeper.zip

(51.71 KiB) Downloaded 183 times

tf536r2_2020_06_22_alpha_float.zip

(51.71 KiB) Downloaded 167 times

You're the first person to mention that heat is an issue with the TF536. The keeper ones will be colder but may not work.

[PaulJ_2.0]

@PaulJ_2.0 try out all of these and see if any of them work and stay cold.

tf536r2_2020_06_22_alpha_keeper.zip
tf536r2_2020_06_22_alpha_float.zip

You're the first person to mention that heat is an issue with the TF536. The keeper ones will be colder but may not work.

Ok I have tested the keeper ones and 7 is the best performing of the three (5 refuses to boot), but the CPLD is still quite warm.
6 got too hot and crashed after 15 mins stress
7 is still going fine after 20 mins stress.

[terriblefire]

Hmmmm. I think there is a short somewhere.

[PaulJ_2.0]

Hmmmm. I think there is a short somewhere.

100% not shorted. The CPLD isn't getting any hotter and is still going fine stressed after 40 mins, so it seems like a win.

[terriblefire]

Hmmmm. I think there is a short somewhere.

100% not shorted. The CPLD isn't getting any hotter and is still going fine stressed after 40 mins, so it seems like a win.

I expected 7 to be the best but the phase shouldnt cause a temp difference.. that *IS* weird.