• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 29 subscribers
  • Views 628 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.

MCF8316A: Errata Help plus general Questions.

Koen Coppens
Prodigy 40 points
Part Number: MCF8316A
Other Parts Discussed in Thread: MCF8315C, MCF8315A

Tool/software:

Dear Reader,

We have developed a design using the MCF8316A, but during the software development process, we came across the following forum posts:

These posts are somewhat outdated, but they suggest that the errata issues have been addressed.
Question 1: Are the errata issues mentioned in these posts resolved in the current release of the MCF8316A? (This post kind of makes it look like it is: MCF8316A Fixes for Errata in Production Version)

We have purchased a couple of EVM boards to test and tune our motor. 

The motor runs smoothly most of the time, but occasionally it locks up during operation, drawing all available power from the PSU (which then limits the current).
Question 2: Do you have any suggestions for resolving this issue? Could it be related to the errata mentioned earlier?
Question 3: Would the MCF8315C or MCF8316A be a suitable choice for driving this motor?

Our original plan was to use the MCF8315C instead of the larger MCF8316A.
Question 4: Are there any disadvantages to using a larger driver than necessary (apart from cost)? We typically run our motor between 3W-10W @14V.
Question 5: If the errata are still present in the MCF8316A, have they been addressed in the MCF8315C?
Question 6: Is the limited availability of the MCF8315C due to it being a new product, or are there other supply chain issues affecting stock?
Question 7: Is there an EVM board available for the MCF8315C? I could only find one for the MCF8315A.

Thank you for your assistance and advice.

Best regards,

Koen

  • 0
    TI__Mastermind 26152 points

    Hi Koen,

    We are out of office this week, we will respond to you by end of week.

    Thanks and Best Regards

    Venkatadri S

  • 0 in reply to Venkatadri Shantaram84961
    Prodigy 40 points

    Hey Venkatadri,

    Is there any progress on this?

    Kind regards

  • +1
    TI__Mastermind 26152 points

    Hi Koen,

    Thanks for posting the question and sorry for waiting long.

    Yes, the errata listed for MCF8316A is fixed and new revision of the device are MCF8316C (8A Max), MCF8315C (4A)

    Answer to questions

    Answer to Question 1: For MCF8316a we should not use I2C communication while motor is running, this affects the bandwidth and loses synch. Your observation is due to these errata.

    Answer to Question 2: Do not use continuous status reading which motor is running (Avoid I2C burst)

    Answer to Question 3: This motor is 12V, 1.5A peak, MCF8315C is sufficient for this

    Answer to Question 4: No disadvantage from technical, the RDSON H+L for MCF8315C is up to 250mOhm, for MCF8316C it is 90mOhm. If you need high load and if thermal control possess concern, then we can consider MCF8316C. Although, there are configurations to minimize the temperature rising, this is achieved by reducing switching frequency, PWM Mode from Continuous SVM to discontinuous SVM (Here not all 6 switches operates, few switches are on for 120 degree).

    Answer to Question 5: Yes on MCF831C these erratas are fixed ( Please verify the table in the end of the thread)

    Answer to Question 6: I would like to know about your region , we will check with local tech support team to get in touch.

    Answer to Question 7: You can replace MCF8315C on the same EVM. 24 in based EVM is available and also samples MCF8315C data sheet, product information and support | TI.com . You can visit the link for other information about GUI (Motor studio), free samples and EVM

    Thanks and Best Regards

    Venkatadri S

  • 0 in reply to Venkatadri Shantaram84961
    Prodigy 40 points

    Hi Venkatadri S,

    Thank you for your detailed response!

    I appreciate the answers you provided. Given that the MCF8315C1VQRGFRQ appears to be pin-compatible with the MCF8316C, would it be possible for us to use it on our boards for now? This would help us complete the prototypes, and we can then switch to the MCF8315C (non-Q version) in the final design. Also, could you confirm if the software is compatible between the MCF8315C and the MCF8315C1VQRGFRQ?

    Regarding your previous questions:

    • Question 6: The Netherlands
    • Question 7: I'm not entirely comfortable soldering the MCF8315C1VRRYR by hand. Additionally, I noticed that the EVM is currently out of stock. Could you assist us with this?

    I look forward to hearing from you soon.

    Best regards,
    Koen Coppens

  • +1 in reply to Koen Coppens
    TI__Mastermind 26152 points

    Hi Koen,

    I missed to respond to this thread, yes you can use MCF8315C on the MCF8316C EVM and use it.

    Software is compatible, motor studio detects MCF8315C. 

    Current levels are different between the two but register map is same. If there is any performance difference, we can adjust the current levels.

    Thanks and Best Regards

    Venkatadri S