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MCT8316Z: MCT8316

Raanan Jacobson
Prodigy 30 points
Part Number: MCT8316Z

Some questions concerning the MCT8316Z (BLDC Driver)
• "T" (HW) Vs. "R" (SPI) configuration
o In the "R" the Direction is defines through SPI while the PWM still managed through HW pin. Why?
is it intend for a special operation (i.e. constant direction …) ?
o What is the meaning of the note "Texas Instruments recommends motor direction (DIR) change when the motor is stationary"? in controlled or stabilized system the Direction is constantly changed (i.e. during operation).
• Current Limit Function:
o The I-Limit defines as "0A to 8A", what is the real minimum controlled current (i.e. can the driver stabilize 2mA for example) ?
o What is the current resolution of the I-Limit ?
o Can the I-Limit in the "T" configuration be operated in synchronous mode ?
o In the "T" configuration, can the PWM and I-Limit be operated together in order to achieve a better current stabilization (i.e. for example, to operate the PWM in 50KHz or 100KHz with higher duty cycle than require just to let the "cycle by cycle" to operate in higher freq. then the internal 20KHz) ?
o What I-Limit features or limitations exist only in the "T" or only in the "R" configurations ?
o Any App. Note for the I-Limit Feature ?

  • 0
    TI__Genius 13460 points

    Hi Raanan,

    Raanan Jacobson said:
    In the "R" the Direction is defines through SPI while the PWM still managed through HW pin. Why?

    Are you referring to the PWM_MODE, if you are then with the "R" variant the PWM_MODE is controlled by the register which is set through SPI. The MODE pin, on the "T" hardware variant, which would be used to set PWM_MODE is replaced with an SDO pin for the SPI variant.

    If you are referring to the PWM input then this pin was decided to be used as the speed input for both devices.

    Raanan Jacobson said:
    What is the meaning of the note "Texas Instruments recommends motor direction (DIR) change when the motor is stationary"? in controlled or stabilized system the Direction is constantly changed (i.e. during operation)

    For the MCT8316Z we recommend only changing the motors direction when the device is not spinning.

    Raanan Jacobson said:
    Can the I-Limit in the "T" configuration be operated in synchronous mode ?

    Yes it can, If you use PWM_MODEs 3-7.

    What is your target application with our device, what motor are you using, and what is your systems nominal voltage?

    Regards,

    Joshua