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Original question:

MCF8315A: Longevity and Product Life Cycle Inquiry for MCF8315A hi

MCF8315A: Regarding SPEED input

Daisuke Higa
Genius 4350 points
Part Number: MCF8315A
Other Parts Discussed in Thread: MCF8315C-Q1, MCF8315C

Tool/software:

Hi support team all.

I have received the following inquiry from my customer.

Q1:

The SPEED/WAKE pin is connected to the AVDD pin.

The speed control is set to analog input.

When the power is turned on, the device does not start any operation.

I cannot access it via I2C.(I cannot read or write.)

Why is this?

At least, I could not find any information on the datasheet.

Is this a specification that is not mentioned in the datasheet?

Q2:

I would like to drive the SPEED pin at 100% duty without controlling it externally.

This is not possible with the MCF8315A, so please tell me a product that can clear this issue.

An additional condition is that the product has the same package size and pin arrangement.

I found the MCF8315C-Q1 on the web.

However, there was no information in the datasheet of this product that could be used to determine whether this is possible.

Best regards,

Higa

  • 0
    TI__Mastermind 23602 points

    Hi Higa -san,

    Answer to Q1 & Q2: MCF8315A do not support zero speed command, this feature is updated in the MCF8315C

    Hope this clarifies the question.

    C and D version supports your requirement.

    Thanks and Best regards

    Venkatadri S

  • 0 in reply to Venkatadri Shantaram84961
    Genius 4350 points

    Venkatadri-san

    Thank you for answering.

    I understand that it does not support anything other than 0 speed input.

    Can you please answer my other question regarding Q1?

    If 100% duty is input to the SPEED pin at startup, I2C communication is not possible. Why?

    ーーーーーーーーーーーーーーーーーーーーーーーーー

    The SPEED/WAKE pin is connected to the AVDD pin.

    I cannot access it via I2C.(I cannot read or write.)

    Why is this?

    At least, I could not find any information on the datasheet.

    Is this a specification that is not mentioned in the datasheet?

    ーーーーーーーーーーーーーーーーーーーーーーーーーーーー

    Best regards,

    Higa

  • +1 in reply to Daisuke Higa
    TI__Mastermind 23602 points

    Hi Higa,

    Can you provide more information the issue you are seeing.

    I2C communication is independent of the state, only EEPROM writes are not allowed while motor is running.

    Thanks and Best regards

    Venkatadri S

  • +1 in reply to Venkatadri Shantaram84961
    Genius 4350 points

    Venkatadri-san

    The issue has been resolved so I close this post.

    I appreciate your support.

    Regards,

    Higa