F28377D issue with Hi-Res deadband rising edge control.

Long Pham28

Hi,

The Hi-res deadband rising edge control doesn't work correctly. Here's how I ran into the issue:

1. Enable MEP deadband control for both edge: EPwm1Regs.HRCNFG2.bit.EDGMODEDB = 0x3;

2. Set normal Deadband rising edge to 2 or 3: EPwm1Regs.DBRED = 2 (or 3)

3. Try changing EPwm1Regs.DBREDHR.bit.DBREDHR => the deadband doesn't change as expected.

The MEP deadband control works well with DBRED NOT equal to 2 or 3 and well for falling edge.

Bug is when rising edge with Normal deadband set to 2 or 3.

Is that a bug with the new chip?

0 Hrishi Nene over 9 years ago

Hi,

This is not a bug on the device. We need to update the TRM to include the following restriction when using hi-res deadband.

Just like the duty cycle restrictions when using HRPWM, the DBRED and DBFED values must be greater than 3 to use hi-res dead-band.

Hrishi

0 Long Pham28 over 9 years ago in reply to Hrishi Nene

Thanks for your reply Hrishi,

I didn't know that the DBRED must be greater than 3. Yes, All works well with DBRED > 3.

Long

C2000 microcontrollers forum