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MCF8315C: looking for replacement device of Nisshinbo Micro Devices Inc NJW4302

Kazuhiko Hirano
Genius 14248 points
Part Number: MCF8315C
Other Parts Discussed in Thread: MCT8315A, , MCF8315EVM

Tool/software:

Hello,

Nisshinbo Micro Devices Inc NJW4302 (THREE-PHASE DC BRUSHLESS MOTOR CONTROL IC, datasheet is attached) would be EOLed and my customer is looking for replacement devices. Does TI have any recommendations?
NJW4302.pdf

Best regards,

K.Hirano

  • 0
    TI__Mastermind 19510 points

    Hi K.Hirano,

    What is the rated peak motor current? Most of our integrated control devices are integrated FET so the rated peak motor current could limit the device selection. 

    For motors at 4.5-5.5 V we typically recommend DRV10x devices like the DRV10964 or DRV10987. The DRV does not offer speed regulation like the NJW4302 so this would have to be implemented externally. Most DRV10x are sensorless, so if the customer would prefer a sensored solution I would recommend looking at the DRV10970.

    For a device with speed regulation I recommend taking a look at the MCF8315C or MCT8315A.

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    TI__Genius 14248 points

    Joshua,

    Thank you for your responses.
    Let me ask some more about MCT8315C.
    MCF8315C frequency mode can control the speed of the brushless motor according to the frequency of the PWM signal？
    Also, in order to use the frequency mode, it is necessary to set the mode from the I2C bus, and it seems that it cannot be used without changing the F/W mode, right?
    Are there any devices that support Frequency Mode only with hardware settings?

    Best regards,

    K.Hirano

  • 0 in reply to Kazuhiko Hirano
    TI__Mastermind 19510 points
    Kazuhiko Hirano said:
    MCF8315C frequency mode can control the speed of the brushless motor according to the frequency of the PWM signal？

    Yes, the input PWM frequency will determine the speed command for the motor. To adjust the speed command the PWM signal frequency needs to be changed.

    Kazuhiko Hirano said:
    Also, in order to use the frequency mode, it is necessary to set the mode from the I2C bus, and it seems that it cannot be used without changing the F/W mode, right?

    Correct, to set the speed mode to be controlled by input frequency, the speed mode will need to be set over I2C. This setting can then be written to EEPROM so that on future power ups the MCx8315x will have the speed mode set to frequency mode without I2C configuration needed.

    Kazuhiko Hirano said:
    Are there any devices that support Frequency Mode only with hardware settings?

    The MCF8315C and MCT8315A both can be configured over I2C to be in Frequency Mode at power up by writing the configuration to EEPROM. Would this work for the customer? 

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    TI__Genius 14248 points

    Joshua,

    Just in case, let me confirm if my customer understood your answers correctly.
    The following understandings are correct?

    - In wavenumber mode, the speed of the motor can be adjusted by the frequency of the signal supplied to the speed pin of the MCF8315C, MCT8315A, etc.
    - It is necessary to change the settings via the I2C bus, but once the configuration is written to the E2PROM, reconfiguration is not required.

    And they have further questions as follows.

    Q1: Is it possible to request the manufacturer or TED to work on something like a normal E2PROM, and implement it with settings written to the MCF8315C, MCT8315A, or similar product?
    Q2: Is there a user doing that?
    Q3: If this is possible, is it possible to use a development kit such as the MCF8315EVM to determine the setting value?
    Q4: The MCF8315C and MCT8315A are both sensorless, but what are the main differences? (I don't understand what FOC is on the MCF8315C.)  Though they saw the following E2E threads, they were not able to understand the differences well.

    https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1379193/mcf8315a-part-number-difference?tisearch=e2e-sitesearch&keymatch=MCF8315C#
    https://e2e.ti.com/blogs_/japan/b/automotive/posts/669375

    Best regards,

    K.Hirano

  • 0 in reply to Kazuhiko Hirano
    TI__Mastermind 19510 points

    Hi K.Hirano,

    If by wavenumber the customer means frequency mode or 3h in SPEED_MODE/SPD_CTRL_MODE, then yes the customers understanding of both items is correct.

    Q1: We typically do not program the EEPROM for customers when manufacturing.

    Q2: We have customers who do program the EEPROM of our MCx devices and then install them on their boards with out the intention of accessing the I2C pins again.

    Q3: It is possible to use the MCF8315EVM to determine appropriate register settings for their application.

    Q4: The main difference is the motor commutation of FOC (Field-Oriented Control) for MCF83xx and Trapezoidal for MCT83xx. FOC usually can achieve higher efficiency and better acoustic performance over Trap. The Trap algorithm on the other hand can achieve higher speeds than our FOC algorithm can.

    Videos 4 and 9 in this video series may help the customer better understand the differences between FOC and Trap commutation algorithms: https://www.ti.com/video/series/precision-labs/ti-precision-labs-brushless-dc-motors.html#tab-1

    Regards,

    Joshua