• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 83 subscribers
  • Views 355 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Clock Requirements and Characteristics

Chuan En Andrew Ong
Prodigy 30 points

Hi all,

Having read the datasheet for TI 28335 6.7 3 Device Clock Table at page 125, I have some questions regarding the clock performance of this microcontroller.

  1. Does this microcontroller supports output signals in the MHz range? e.g. pulse generator at 1 MHz. I'm not sure but is this under the ADC clock?
  2. Does this microcontroller also supports input signals DAC in the MHz range? e.g. 1MHz feedback signals 

Thank you for reading :)

  • 0
    TI__Guru 60865 points

    Hi Chuan,

    1) It is certainly possible to output pulses in the MHz range, although control may become a little tricky.  You will want to look at the ePWM module.  You could also consider the HRPWM module.  This allows precise placement of PWM edge beyond what the PWM clock allows (up to 150ps resolution).  This may allow you to get the resolution you need at a lower (and easier to control) pulse rate?

     2) For input signals, I think you want to look at the ADC module.  The maximum possible sample rate is 12.5 MSPS, so sampling multiple 1MHz signal is certainly possible.

    Can you comment on intended application?

  • 0 in reply to Devin Cottier
    Prodigy 30 points

    Application would be for controlling bidirectional switches in full bridge configuration. control signals would not be like spwm but turning on and off the switches in a timely fashion to obtain desired output. 

    So is the epwm or hrpwm modules configurable (e.g not going to use sine wave to compare with sawtooth wave to get pulses and no modulation index and so on and so forth)to suit my high frequency pulses requirements?

  • 0 in reply to Chuan En Andrew Ong
    TI__Genius 10820 points

    Hi Chuan,

    Yes, PWM modules on these devices are very flexible and configurable. They can be used for generating various kinds of PWM waveforms for different power stages. Please refer to the ePWM user guide for more information on these modules and their usage (http://www.ti.com/lit/ug/sprug04a/sprug04a.pdf).

    - Hrishi