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  • Forum Post: Setting PWM signals 'high' at the same time.

    Woo-Seung Yeo35126
    Dear Champs, I got technical question from my customer about controlling PWM singnals as follows. In motor control inverter application, 6 PWM signals are used to ratate motor. To stop motor, 6 PWM control signals have to be set 'high' as IDLE at the same time. But it looks that TMS320F28335...
    on Dec 24, 2008

  • Forum Post: TZ (Trip-Zone Input) active voltage level for TMS320F280x

    Wayne Huang
    Champs, My customer needs to know TZ (Trip-Zone Input) active voltage level for using TMS320F2806 . It seem not be found on datasheet. Do you have any idea about that? Thank you. Wayne Huang
    on Jan 22, 2009

  • Forum Post: TMS320F2812 Communication with another TMS320F2812

    Sanjeevikumar Padmanaban
    on May 19, 2009

  • Forum Post: PWM outputs of GP Timer 1 aren't working

    Nick D
    I'm using the F2812 EzDSP to generate 4 PWM outputs using the GPTimer1-4 outputs. All of the code was working correctly, and I was using the DSP to test some IGBT gate drivers. One of the driver boards shorted and started to burn, so I immediately turned off the power. Now GP Timer 3 and 4...
    on Jul 21, 2009

  • Forum Post: Re: how many simultaneous PWMs can 28335 generate maximum?

    Mustafa
    Hello Brett, thank you for the answer, I will be confident with F28335 while starting the project. I don't have experience with TI DSP architectures. I started reading the user's guide you suggested. I am confused with different ePWM submodules. I will use PWMs to control servo motors. 8...
    on Aug 8, 2009

  • Forum Post: Wrong configuration in dead band module for PWM?

    cricho
    Hello all, I am working with the TMS320F28335 and I have some problems configuring the PWM's. The attached image correspond to PWM1A (green) and PWM1B (blue). I am trying to make them complementary, so I configured the dead band module in such way. It works fine "almost" all the time...
    on Sep 2, 2009

  • Wiki Page: [EVA/EVB] PWM Pin state at power-up (2407A)

    Lori Heustess
    Q: When the power supply to the DSP is switched ON all PWM pins are at High 3.3V. This will lead to switching On of all IGBTs on Power ON and failure due to DC Bus short circuit. We want to make all the PWM pins LOW on Power On. What should be done to make it low initially when power is switched ON...
    on Jan 6, 2010

  • Forum Post: PWM noise on ADC

    CoreyC
    Hello, I am generating a PWM signal that is modulated to produce a 12khz sine wave when filtered. However, when the PWM is turned on, a small 12khz signal appears on the ADC channels when I sample them. Is there a way to reduce this effect or is there inherent to the DSP? Thank you, Corey
    on Jan 22, 2010

  • Forum Post: Re: PWM noise on ADC

    Arefeen
    Hello No, it is not inherent to DSP or to any microcontroller. ADC channels shouldn't be corrupted by PWM operations/signals. However, the signal quality will depend on board layout and manufacturing. I believe there are several application notes from Texas Intruments discussing how to make boards...
    on Jan 25, 2010

  • Forum Post: Re: PWM noise on ADC

    Brett Larimore
    Corey, As Arefeen mentions, your ADC should not see PWM signals directly, and that board layout can generally fixes the issue. However, on the ADC, impulses found on the rising and falling edges of PWM (when the mosfets/mosfet drivers charge/discharge energy to the ground plane) is a very common issue...
    on Jan 25, 2010

  • Forum Post: TMS320F2812 PWM polarity and dead-time flexibility

    Adam Barkley
    This question is concerning the (lack of) configurability of the dead-band timing for different PWM pin polarities. The application is for a DC/DC converter utilizing a half-bridge of IGBTs. I am using a TMS320F2812 DSP to generate a symmetric PWM using Event Manager A's GP Timer 1, Full Compare...
    on Mar 9, 2010

  • Forum Post: Lost USB connection with the eZdsp

    gideon prior
    Hello all, I have been having trouble keeping the eZdsp (320f28335) connected to code composer studio. I have read several other similar posts and tried the suggestions to no avail. To diagnose the problem, I have set up a very simple circuit where I connect the epwm1a output to a digital isolator...
    on Mar 31, 2010

  • Forum Post: Different PWM techniques using Piccolo

    Elijah Toppo
    Hello, I am new to this site and also new to using MCUs. I've just got a Piccolo F28127 and want to experiment producing the different PWM techniques for a simple basic inverter. The different PWM techniques that I want to realize are 1) Single PWM 2) Multiple PWM 3) Sinusoidal PWM...
    on Apr 3, 2010

  • Forum Post: PWM with variable Frequency

    Christian Banzhaf
    Hello I'm new to the TMS320F28023. I have worked through the examples from TI and i already have a PWM Signal with fixed Frequency and where i can vary the duty cycle. But now i need a PWM Signal which turns on when Timebase = 0. So i set EPwm2Regs.AQCTLA.bit.ZRO = AQ_SET. But now i need...
    on May 7, 2010

  • Forum Post: ADC calibration issue with assembly code

    Caspar
    Hello. I am using the DSP320F812 eZdsp to control 2 converters via PWM signals. The issue is with the calibration, since the calibration is done with unsigned integers, a negative offset or small disturbance will cause the values to spin around and become positive, in this case -1 = 4095. The...
    on May 11, 2010

  • Forum Post: PWM Software forced Synchronisation

    Christian Banzhaf
    Hello I try to synchronisate my PWM signal by software. So i set the SWFSYNC Bit in the Timebase Control Register. EPwm2Regs.TBCTL.bit.SWFSYNC = 1; In the init function i set EPwm2Regs.TBCTL.bit.SYNCOSEL = 0; as the datasheet says. But the counter isn't reset when the SWFSYNC...
    on May 18, 2010

  • Forum Post: How to program DCAEVT1.sync

    Christian Banzhaf
    Hello everybody I try to sync my PWM Signal through the DCAEVT1. My code looks like this: EPwm2Regs.TBPRD = 1000; EPwm2Regs.TBPHS.half.TBPHS = 0; EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; EPwm2Regs.TBCTL.bit.PHSEN = TB_ENABLE; EPwm2Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; EPwm2Regs.TBCTL.bit.CLKDIV...
    on May 21, 2010

  • Forum Post: tms320f2808 Pwm Trip zone force

    Giuseppe F.
    hi, I need to disable the pwm output for a few cycles and re-enable it synchronously with pwm rate. (i'm talking about tms320f2808 but I think tms3202833x should have the same PWM peripheral block) I'm trying this solution: I'm trying to use the "Trip-Zone Force Register"...
    on May 31, 2010

  • Forum Post: Re: ADC test in 28335

    Vanderley Maia
    Hi Ananda, I propose you to use a GRAPH to see the result of your ADconversion. First of all: I'm using the Code Composer Studio 4 version Microcontroller, you can make download gratuit http://processors.wiki.ti.com/index.php/Code_Composer_Studio_v4 Let's begin: 1) New-Project...
    on Oct 17, 2010

  • Forum Post: PWM: Need help on getting ePWM on F28035 (Piccolo) to work

    Paul Werle
    Please let me know what I am missing on getting the PWM to work. I'm using the F28035 Experimenter's Kit and the FlashigLeds project as a template. I've referenced both the spruge9d (ePWM module) and the Piccolo training lab 7 for examples. I can make changes to the EPwm1Regs.DBCTL.bit...
    on Dec 22, 2010

  • Forum Post: Re: PWM: Need help on getting ePWM on F28035 (Piccolo) to work

    Paul Werle
    Chrissy, Thank you for your quick reply. Yes, enabling the time-base clock exactly like you suggested was what was missing. It is working now. Thanks again. Merry Christmas
    on Dec 22, 2010

  • Forum Post: pwm generation on F2808

    Ramazan Bicer
    on Apr 25, 2011

  • Forum Post: Quick PWM Q

    Toby Mole
    Hi There I just came across the TMS320F280200. I have downloaded the ePWM ref guide in relation to this, but I note that it is very detailed and will take quite a bit of reading... I would like to check suitability of this device before spending the afternoon reading the pdf, so if anyone has familiarity...
    on Apr 27, 2011

  • Forum Post: Re: pwm generation problem on F2808 dsp

    Ramazan Bicer
    thanks for the reply,Dear Shank. but i solved this problem by changing the sin vawe's sampling time from 1/10000 to 1/5000. But i still couldnt understand what is the real problem? here is the last status of my filtered pwm output..
    on May 1, 2011

  • Forum Post: Re: pwm generation problem on F2808 dsp

    Ramazan Bicer
    my sine waves are at the frequency of 50 hz,Timer period of my epwm block is 1/50000 , and finally CPU clock of my F2808 dsp in simulation is 100 mhz. but i dont know the frequency of my scope. Do you think this problem is related with this?
    on May 7, 2011
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