TMS320F28076: PWM glitching at power up and POR

Barrett Bryan

Part Number: TMS320F28076
Other Parts Discussed in Thread: TPS62825

I'm looking for more info on the state / impedance of PWM pins during power up and during internally triggered power on reset. Which newer C2000 devices (mentioned in post below) can ensure glitch free startup of GPIO and PWM?

https://e2e.ti.com/support/microcontrollers/c2000/f/171/p/802034/2969087

TPS62825 will be used for 1.2V supply and has 2.2V UVLO (3.3V input to this device). Are there any sequencing recommendations to ensure glitch free operation?

over 4 years ago

0 Nima Eskandari over 4 years ago

TI__Guru 51940 points

Jason Whiles can you comment on this?

0 Jason Whiles over 4 years ago

TI__Expert 4810 points

Barrett,

The IOs on the F2807x, F2837x, F28004x, and other devices will keep the IOs in a high-impedance state out of POR until the user software configures them as output. There is no risk of PWM glitching with these devices, this is an improvement over devices like the F2812 this post references.

For general power sequencing information you can reference the online datasheet section here:

https://www.ti.com/document-viewer/TMS320F28076/datasheet/power-sequencing-sprs8819916#SPRS8819916

Best regards,
Jason

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28076: PWM glitching at power up and POR