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MCT8329A: GUI user manual, where can I find it?

Phil Langhorst
Prodigy 80 points
Part Number: MCT8329A

Is there a user manual for the MCT8329A_GUI utility? what the link?

I need answers to basic questions like:

   if the GUI is communication with the EVAL board, and you do File/Load registers, will the values go into the EVAL board immediately, or must I press save EEPROM?

  If I do Save EEPROM, should the EVAL board work with my settings upon power up, never being connected to the GUI?

 Is the cycle by cycle current limit the only current limit? Is there an average current limit? How does the gain setting effect the current limit?

  • 0
    TI__Genius 9220 points

    Hi Phil,

    Unfortunately, we don't have a GUI specific user manual. To answer your questions:

    1. The MCT8329A's EEPROM registers (in the non-volatile EEPROM) has a corresponding shadow/mirror registers copy (in the volatile RAM) that contains values being used by the device algorithm when the device is running. When the MCT8329A first powers up, the contents of the EEPROM registers are copied from the EEPROM area into the shadow registers area in RAM. And when any settings is changed in the GUI, these changes are written into the shadow registers.
      When you load a register file in the GUI, these settings are immediately written to the shadow registers only, so they will take effect immediately, but won't be written to the EEPROM memory yet.
      You will need to then press the "WRITE TO EEPROM" button, which will trigger the MCT8329A to copy the contents from the shadow registers into the EEPROM area, in order for the settings to be retained through power-cycle
    2. Yes, once the settings are stored in EEPROM (non-volatile), when you power cycle the board, the shadow registers will be loaded with the settings stored in the EEPROM, so you won't have to reconfigure the same settings through the GUI.
    3. The CBC_ILMIIT is the primary current limit setting and directly limits the current applied to the motor from exceeding the configured threshold. It uses a hardware comparator to compare the internal current sense amplifier (CSA) output to the CBC_ILIMIT. 
      Another similar current limit setting is the LOCK_ILIMIT, which uses an internal ADC to monitor the CSA output instead of a hardware comparator.
      If by average current limit, you are referring to limiting the power supply current draw, then I would recommend utilizing the Power Loop mode. You can directly command the desired output power, and the device's closed loop control will regulate to output a constant power based on the input command. Or you can set a power limit that the device won't exceed during operation.

    Regards,
    Eric C.

  • 0 in reply to Eric Chen
    Prodigy 80 points

    I meant the average to the motor, not from the power supply.  I realized that since this is a trapezoidal waveform, the peak is directly related to the average and RMS value so there really is no need to limit the average, or the RMS motor current. It would be nice to have an RMS limit though because the motors are rated by RMS current. It bothers me that the CBC_ILMIIT is in volts, how do I convert that to amps? 

    Thanks for the help Eric.  I wish there was a manual.  Setting this up is all guess work. The most critical part is open loop.. there A1 and and A2 parameters, what do they do? Why are they in V/s not hz per second?