PWM with multiple period using LPC546xx SCTimer/PWM

[hemanthvasista]

Hello ,

I am using LPC54628(OM13098) development board.

I intent to use PWM output with different period.

Is it possible to have different PWM period in SCT0?

e.g.

SCT0_OUT4      with 50KHz period (+ variable Duty %)

SCT0_OUT6      with 100KHz period (+ variable Duty %)

regards,

Hemanth

[Alice_Yang]

Hello  Hemanth S ,

In generally No, we only can set different PWM duty cycle.

Regards,

Alice

[hemanthvasista]

Hello Alice,

Thanks for your inputs.

Is possible to configure the SCTimer as complimentary pair?

e.g.

SCT0_OUT4  with 100KHz period (+ variable Duty %)

SCT0_OUT6  complimentary output of (SCT0_OUT4)

regards,

Hemanth

[Alice_Yang]

Hello Hemanth,

Yes, just config output3 and output4 with opposite level.

Recommend you use the MCUXpresso Config to config it:

There are PWM demo under SDK:

Regards,

Alice

[hemanthvasista]

Hello Alice,

Thanks for the info.

How to set the dead time in SCTimer/PWM?

Is it possible to have complimentary PWM pair in CTimer?

I couldn't get any options.

regards,

Hemanth

[Alice_Yang]

Hello Hemanth,

You can have a look at the SCTimer cookbook, it includes these demos you mentioned.

https://www.nxp.com/docs/en/application-note/AN11538.zip   

Regards,

Alice

[hemanthvasista]

Hello Alice,

Thanks for the info.

Is complementary PWM with dead time possible from C Timer? The above reference tells mostly about SC Timer.

regards,

Hemanth

[Alice_Yang]

Hi Hemanth,

No, because  "All single edge controlled PWM outputs go LOW at the beginning of each PWM cycle.

Each PWM output will go HIGH when its match value is reached."

Regards,

Alice

[hemanthvasista]

Thanks for the info Alice.

regards,

Hemanth