F2806x ISO controlCARD gets hot in DRV8312 Kit

Hi Patrick,

First of all please check the pin to pin compatibility of the F28069 & F28035 controlCard to the board. Also, is the MCU getting hot too? Check the LDO on control card. Many a times its the LDO that fails. Monitor the voltage levels around it.

Regards,

Gautam

Hello Gautam,

Thanks for your answer, for me pin compatibility is okay because I bought the Kit with DRV8312 and F28069 controller. Moreover, I find on the forum some discussion where PM-Sensorless project works with both F28035 and F28069 just by ‘set active’ the good controller in the build configuration menu of CCS.

I checked the power supply levels on the card and everything seems to be okay (TP1:5V, TP2:3,3V, TP4:5V, TP5:3.3V) but the MCU is still getting hot. When I try to run the PM-Sensorless project, I directly get a default with the LED 6 on the board. The motor is the standard one with the kit (NEMA17 BLDC/PMSM 55W Motor) and the DRV8312 is supplied by the 24V wall power supply.

At the beginning all the LEDs are green on the board as the board don’t seems to be damaged. The chip get hot when the board is powered without any control running at all.

Regards,

Patrick

The chip get hot when the board is powered without any control running at all.

Ok fine, any equipment at your end to measure the exact or near about temperature of the device?

It's about 40 °C. You can still touch it by hand, but it is unusually warm/hot for a MCU in idle. Ambient temperature is 23 °C.

It's about 40 °C.

40 °C is fine, Patrick. By you saying HOT I thought it might be around 70 °C + !

Regards,

Gautam

Okay, thanks for your reply.
I let it idle for the last couple of hours and it doesn't heat up to a point when it becomes untouchable. 

The problem still persists that I cannot do anything with the board. It Do I need to change the switches RSTA, RSTB, RSTC to a certain setup? Now they are set to "MCU". This setting worked fine with the other controlCARD.

It Do I need to change the switches RSTA, RSTB, RSTC to a certain setup? Now they are set to "MCU". This setting worked fine with the other controlCARD.

Not required. Did you try debugging the kit code meant for F28069 on CCS? Try monitoring the parameters on CCS watch window and compare them with F28035 watch expressions.

Regards,

Gautam

Hello Gautam,

I am a colleague from Patrick. I also tried to run PM-Sensorless code on DRV8312 with F28069. I tried something this morning to compare result getting out of the buildlevel 1 using F28035 and F28069 as you suggest.

I tried to run the buildlevel 1 of the PM_Sensorless project with F28035 it works fine, I get appropriate results going out of the SVGEN_MACRO as you can see in attachment.

With the F28069 (also in the attached document) I get some strange result that I can't explain. I also check these signals with the oscilloscope to avoid a display issue with the graph and I get the same strange signals as on the graphs.

Thanks for yours inputs

Regards

David

Hi David,

With the F28069 (also in the attached document) I get some strange result that I can't explain. I also check these signals with the oscilloscope to avoid a display issue with the graph and I get the same strange signals as on the graphs.

Yup, the F28069 results seem very odd and deviated. Can you attach the F28069 sample code that you're using (if the modifications are not confidential odd course)?

Regards,

Gautam

Hello,

I tried different things and finally it works by adding the linker command file :

I don't know why it was not present for the F28069 version but was present for the F28035 (PM_sensorless project with DRV8312). Also strange that I was able to compile without this file.

Thanks for your help Gautam 

David

Oh! Thats Great.

Goodluck & Regards,

Gautam

Hi David,

I am also facing similar problem. Want to Implement PM_Sensorless project on F28069.

I believe TI code is based on 28035.what changes are required to the original code provided by TI to make it work with F28069.

Can you please help me

Thanks for your help.

Ravikumar

in the project, right click, Build Configuration --> set the F2806x active

that is all you have to do

the GUI .out for these kits is just for the F28035 it ships with, not the F28069.

Also, since you have these kits you should be aware that you will get much better performance by using InstaSPIN-FOC or InstaSPIN-MOTION which is enabled by using the TMDSCNCD28069MISO controlCARD and software from MotorWare