CCS/TMS320F280041: About TMS320F280041 trip-zone signals TZ1 to TZ6 active status issue

user5728214

Part Number: TMS320F280041

Tool/software: Code Composer Studio

Dear Mr./Mrs.,

I am from China. Now we use TMS320F280041 for one project.

For using its EPWM trip-zone function, we config it to one-shot trip event and know the trip-zone signals TZ1 to TZ6 (also collectively referred to as TZn) are active low input signals in the datasheet, but we want to use falling edge instead of low level for triggering TZ .

Could you tell us how can implement this?

Thanks a lot!

Best regards!

Shao Jesse

over 6 years ago

0 Vasudha Bhadoria over 6 years ago

TI__Genius 10845 points

Hi,

I am looking into this and will get back shortly.

Thanks
Vasudha

0 user5728214 over 6 years ago in reply to Vasudha Bhadoria

Prodigy 30 points

Hello,

Since our project schedule is very tight, could you give us some advice for this issue?

Thanks a lot!

Best regards!

Shao Jesse

0 Vasudha Bhadoria over 6 years ago in reply to user5728214

TI__Genius 10845 points

Hi,

I don't think it is possible to use the falling edge to trigger trip. PFB the description from TRM.

A minimum of 3*TBCLK low pulse width on TZn inputs is sufficient to trigger a fault condition on the ePWM module. If the pulse width is less than this, the trip condition may not be latched by CBC or OST latches.

Thanks
Vasudha

0 user5728214 over 6 years ago in reply to Vasudha Bhadoria

Prodigy 30 points

Thanks a lot!

0 Brett Larimore over 6 years ago in reply to user5728214

TI__Guru 57255 points

Hi Shao,

One thing you may be able to consider is utilizing the GP*INV inversion capability to invert the signal between the device pin & the rest of the device (ie INPUT X-BAR or the GPIO mux).

Take a look at the figure labelled "GPIO Logic for a Single Pin" in this device's TRM.

This would then enable the TZ submodule of the ePWM to see the signal as an active-low signal, which is what it needs.

Thank you,
Brett

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CCS/TMS320F280041: About TMS320F280041 trip-zone signals TZ1 to TZ6 active status issue