TMS320F280049: the time comparison between different protection method

Aki Li

Genius 10125 points

Part Number: TMS320F280049

Customer wants to compare the time needed for the below different protection methods:

1) TZ pin(TZ1~3) with protection IO signal input

2) CMPSS protection with analog sampling signal

3) EPWM X-BAR to select IO signal to provide TRIP signal for Digital-Compare of ePWM.

4) External interrupts with protection IO signal input

Could you help give some insight about this? Thank you.

0 Nima Eskandari over 7 years ago

Aki,

I am not sure about CMPSS, but for the other items here is what I think should be the order.

I would choose in this order,

1. Tz

2. Epwmxbar with digital compare

3. Xint with interrupt + code

Tz should be the way to go but dc will provide more flexibility

0 Frank Ankapong over 7 years ago

Hi Aki,

The CMPSS response time is specified in the datasheet.

0 Aki Li over 7 years ago in reply to Nima Eskandari

Nima,

Thank you. Could you help further give approximate time needed for each method? Customer needs a drafted idea for this. Thank you.

0 Aki Li over 7 years ago in reply to Frank Ankapong

Frank,

Thank you. So we still need to know the time from EPWM X-BAR through Digital Compare and Trip Zone modules to the ePWM ouput .

0 Nima Eskandari over 7 years ago in reply to Aki Li

The TripZone/DC module, we only provide a max delay, which is 25ns.

Nima Eskandari

C2000 microcontrollers forum