MSPM0L1303: signal delaying

HS FAE Germany

Part Number: MSPM0L1303

Tool/software:

Hi,
customer has a 307KHz (50% duty cycle) signal on his PCB and has to delay it for 200ns. My idea is to generate 307KHz PWM signal with the timer which can be syncronized with the customer 307KHz signal through GPIO. A 2nd PWM with 307KHz and phase delay of 200ns (to the 1st PWM) can then be generated and output. Would that work?

Regards, Holger

over 1 year ago

0 Dennis Lehman over 1 year ago

TI__Guru 71056 points

Hi Holger,

I'm not quite sure. I'll need some more information about the application for the reason for the delay. What is the delay relative to? A periodic signal, some other timing in the MSP, etc.?

0 Keith Barkley over 1 year ago

Guru 42085 points

It is hard to coordinate separate timers like that. I would just trigger an interrupt on the edge, and in the interrupt routine, wait 200 ns before turning on/off the GPIO.

Or use a monostable multivibrator to trigger a latch.

www.electronics-tutorials.ws/.../monostable.html

Or about 300 feet of coax. 8^)

0 HS FAE Germany over 1 year ago in reply to Keith Barkley

TI__Mastermind 32240 points

I don't think you you can do it in SW or per interrupt. The sys clock is 24MHz -> 42ns (200ns = 5 clocks). I think when you trigger a GP input interrupt and then set/reset a GP output the internal delay will be longer then 200ns.

0 Dennis Lehman over 1 year ago in reply to HS FAE Germany

TI__Guru 71056 points

Hi Holger,

I'm still thinking what might work as a solution. Can you describe how the the 200ns delay is used, ie., is there some event in the system that triggers the start of the PWM and from this event there must be a 200 ns delay?

0 HS FAE Germany over 1 year ago in reply to Dennis Lehman

TI__Mastermind 32240 points

Hi Dennis,
there are two 307KHz signals to control 2 power supplies. The one signal is delay today and therefore produce inefficiency. The two PWM signals should be as syncron as possible. The delay should be around 200ns.
My idea is to use the comparator and output the signal to an GPIO pin. May be the comp filter could be configured to be ~200ns.
The other idea is to use the phase shift of the timers and syncronize with an input GPIO.

Regards, Holger

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MSPM0L1303: signal delaying