TMS320F280049: EPWM Trip Zone Function for Over Current Protection

Qinghua Liu

Part Number: TMS320F280049

Hi All,

Currently I plan to use Comparator Subsystem and PWM Trip_zone configuration inside this MCU to implement the over current protection (or any other hardware fault protection), to replace the external hardware logic in the old design. My question or concern is that how RELIABLE this programmable logic inside MCU is compared with external hardware logic? Is there any scenario (like frequently power reset) which will accidentally disable this protection logic? What about the main clock glitch (from external oscillator) will cause the malfunction of this logic?

Thanks,

Frank

over 7 years ago

0 Nima Eskandari over 7 years ago

TI__Guru 52040 points

Just received your question. Will get back to you Frank.

0 Subrahmanya over 7 years ago

TI__Mastermind 24095 points

Hi,

In case of Power failure the logic will not function - whether it is on-chip or external logic.
A system reset would potentially reset the configuration of the on chip comparator and PWMs.
But PWM outputs are not actively driven when device is under reset.
Even for clock loss - once the PWM and comparators are configured trip action can happen in the absence of clock.
There is also features available on chip to detect clock failure and resetting the device or switching to a different clock source.

0 Qinghua Liu over 7 years ago in reply to Subrahmanya

Prodigy 240 points

Thank you, Subrahmanya. This answers my questions.

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TMS320F280049: EPWM Trip Zone Function for Over Current Protection