help required : Docking station is getting heated : f28335

Hi Mahesh,

For sure your docking station's short circuited. Please check if there's any heat produced by the controller ic on control card. If it heats up too then !?! else u can check for couple of components blown off on docking station. Hope for the later.

Regards,

Gautam

Hi Gautam

Controller card is working fine.it is not getting heated up. Heat is only near the power supply ic of docking station.

regards

Mahesh

Mahesh,

I would suspect damage to U2 on the Docking Station.  If you have rework facilities available, I would recommend taking it off and then seeing if a 1.2ohm short is still seen.  If not, U2 was your issue and I'd replace it (this shouldn't be too big of a job).  If there's still a short, all the other ICs on the docking station are suspect and could be the issue.

I would recommend not plugging the controlCARD into the Docking Station until it is fixed.  Instead I would recommend probing between 5V and GND, 3.3V and GND, & 1.8V and GND in order to check for shorts on the cCARD itself.  For this, the schematic of the F28335 cCARD may be useful and can be found in controlSUITE.

At this time, we do not sell the Experimenter Kit's Docking Station separately.


Thank you,
Brett

Hello, Brett.

I have a similar problem on one of my custom designed boards. Other two works fine. This one's MCU gets hot very quickly up to 95°C. But it still alive :) TP70351 gets heat up to 65°C. The step-down regulator MP1593 stay at 35°C. The 3v3 and 1v8 looks like is shortcircuted somewhere. They has just 2.5-3.0 Ohm between outputs and also 3.0 Ohm between each and GND. Tomorrow I will try to solder out 70351 and take a look.

What is U2 on the Docking station? I've looked at sprc905 and didn't find the U2.

Hi Anton,

U2 is a 5pin regulator having the nomenclature: PS79533 on docking station. I guess replacing this regulator would be sufficient. 

Regards,

Gautam

Hi Brett,

I have removed the u2 IC,now there is no short circuit.

Does it mean that only U2 got damaged and all other ic's are safe?

Is U2(PS79533) available in market?

regards,

Mahesh

Hi Mahesh,

Yes this means U2's damaged. You can purchase this IC from element14 website. Below is the website:

http://in.element14.com/texas-instruments/tps79533dcqg4/ic-v-reg-ldo-0-5a-3-3v-smd-79533/dp/1207355

Regards,

Gautam

Gautam,

Thank you. I have another design with dfferent regulators. Problem was in MCU itself. After replace everything started to work fine.

Gr8. Have fun !

Can i operate Docking Station F28335 with more than 5V let's say 5.1V?