S32K344 LCU force and sync feature

[Ayaz]

I'm currently exploring the Logic Control Unit (LCU) and would like to understand the practical use cases of the Force and Sync features. The reference manual doesn't provide much detail about them.

I have a design where:

• There is one input to the LCU.
• There are two outputs controlled by this input.
• If both outputs become high at the same time, I want to force them to zero.
• Additionally, if a third input becomes high, it should disable both outputs.

I've attached my project, and it would be helpful if you could modify it to implement this logic.

Also, could you explain the use case for Sync in the context of LCU?

What the Operation Mode is used for? , what is the use case ? 

*
What the Software Sync feature does when selected for specific channels?
and what is selecting the force signal means?

[_Leo_]

Thank you for your interest in our products and for contributing to our community.

For LCU, beyond reference manual, there is the following documentation:

• S32K3 RTD TRAINING - LCU [Training Slides] attached
• S32M27x/S32K3 – eMIOS/TRGMUX/LCU – [RTD600]
• S32K3 Motor control SW examples -> 6-step based on HALL position sensor shows how to use LCU for PWM and commutation.
• User Manual for S32K3_S32M27x MCL Driver -> You can found it in upper right corner of the LCU_Ip driver (Peripherals Tools).

I hope this information is helpful.

On the other hand, I must admit that I do not fully understand your design.

• There is one input to the LCU.
• There are two outputs controlled by this input.
• If both outputs become high at the same time, I want to force them to zero.
• Additionally, if a third input becomes high, it should disable both outputs.

What is the logic of the 2 outputs?

You mention a third input, but what is the second input?

Could you provide a time diagram of the signal sequence which address your design requirements?

What is the use case for this design?

[Ayaz]

I've already reviewed the available resources, but I'm specifically looking for a practical example that demonstrates how to use the force and sync features in the LCU.

This an example design:

If, there's a single PWM input to the LCU, which drives two PWM outputs used to control a motor. I want to understand how I can force a change in the output states in case a fault is detected in the motor. The fault signals can also  be provided as inputs to the LCU.

You’ll better understand my design if you check the project I’ve attached.

Also, could you please address the other question I mentioned earlier in the post?

[_Leo_]

Hi again,

Regarding your last comments… please find attached project.

It is based on S32M27x/S32K3 – eMIOS/TRGMUX/LCU – [RTD600], but adds force control support.

The force input can be generated internally or externally, in this case is generated internally with another PWM signal.

Please also note that inverting feature overlaps the force feature:

If you have any further questions, please feel free to continue using our Technical Support Service by creating a new post.

[Ayaz]

Hi,
Thanks for the information.
You might have forgotten to attach the project.!!
I am interested in seeing the configuration for adds force control support.
please

[_Leo_]

Sorry, I forgot to attach the project. Thanks for letting me know.