BOOST-DRV8711: "FAULT" is turned on once power source is supplied. No response after clicking "START/STOP" button.

Hi Siyuan,

We are currently experiencing communications delays when moving from the MSP-EXP430G2 to the MSP-EXP430G2ET. Please see the link:

for details.

The BOOST-DRV8711 may operate with the MSP-EXP430F5529LP. We have not tested this as an alternative, and plan to next week. If you do try this, please let us know the results.

Hi Rick,

Is this communication delay the reason of my problems? Will this delay cause DRV8711 cannot work at all or just make it respond slowly?

Best,

Siyuan 

Hi Siyuan,

The delay could be the reason, but to confirm please try the following:

1) Once the GUI is connected as shown in your image above, toggle the nSLEEP pin or DIR pin and watch the voltage change at the launchpad GPIO pins. The BOOST-DRV8711 does not need to be connected. If the GPIOs are changing, then communication delay is most likely the reason. If not, there could be other problems.

If it works, communications from GUI to mcu is very slow. We have seen delays exceeding 60 seconds versus typically 1 second on the previous MSP-EXP430G2.

We hope to quickly experiment with the MSP-EXP430F5529LP early next week and provide the results.

Hi Siyuan,

Sorry I forget to answer your question:

"When I connected power source to BOOST-DRV8711, even if the current was limited under 0.1 A by the power source, "FAULT" light was on once the voltage exceeded 4V. Is it normal?"

Yes, this is normal. Once the DRV8711 has enough voltage to operate, an undervoltage (UVLO) fault is asserted until the voltage exceeds 8V. At VM=8V, the nFAULT will be de-asserted, but the register bit will continue to indicate an undervoltage fault until cleared.

Hi Rick,

I tested GPIOs when I toggled nSleep/DIR. They didn't change. So there are actually other problems. But anyway, BOOST-DRV8711 cannot normally work with any LaunchPad you are currently selling, even from your side, right? If it is true, we need to find another driver to drive our motor. 

Thanks for your help. We are looking forward for your solution.

Best,

Siyuan

Hi Siyaun,

The BOOST-DRV8711 works well with the MSP-EXP430G2 launchpad. It does not work well with the MSP-EXP430G2ET launchpad. We will be testing the MSP-EXP430F5529LP early next week.

The DRV8711EVM is available for evaluation also, and it works.

Hi Siyaun,

I have tried to compile the code for the MSP-EXP430G2 launchpad on the MSP-EXP430F5529LP and discovered that it does not compile.

There are some variables that do match between the two devices.

It still may be possible to do this, but there are few steps that are required.

One is to modify the code to compile and operate like the MSP430G2553.

The second is to load the code on the launchpad.

And the third is to replace the appProgram.out file in the GUI composer webapps BOOST-DRV8711_GUIv1.0 folder with the .out file that was created when the code was compiled for the MSP430F5529.

This will take some more time to attempt. The next update will be early next week. 

Hi Rick,

Thanks for your update! Do you have plan to test BOOST-DRV8711 boosterpad on MSP-EXP430G2ET? We thought they should be compatible. If not, we will try to return it and buy your evaluation module DRV8711EVM.

Best,

Siyuan