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.
We are using the TI DSP TMS320F28335PGFA. This DSP was used to control a PWM inverter. Both EPWMA and EPWMB modules are used. Total 12 PWM channels.
In our latest design, we selected logic 1 as the off state for these PWM channels. Is this acceptable for F28335? Or is it required to set the off state of the PWM to logic 0 only? It seems that all TI reference design was using logic 0 as off state for the PWM.
Since the board is going to be used for inverter control, the PWM outputs need to be in either off state or high impedance state when we reprogram the DSP. We could either re-program thru JTAG or serial port.
During reprogramming, can the off state or high impedance state of the PWM outputs be guaranteed?
Thanks - Bruce
>> In our latest design, we selected logic 1 as the off state for these PWM channels. Is this acceptable for F28335? Or is it required to set the off state of the PWM to logic 0 only?
You can configure the off-state as you want, either hi or lo. This is done using the Action Qualifier Output registers (AQCTLA and AQCTLB) in each ePWM module.
>> During reprogramming, can the off state or high impedance state of the PWM outputs be guaranteed?
Flash programming utilities have no reason to touch the PWMs (GPIO pins). I'd expect that they will stay in whatever state you have them in prior to starting the programming. Best thing to do is reset the device before programming. The will set the PWMs as GPIO inputs (hi-Z).
-----------------------------David M. AlterSenior Member Technical StaffTexas Instruments Inc.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.