Microcontroller Interfacing with Stepper Motor - Current Consumption

I have this MPC5606S Microcontroller which I have interfaced with this Sonceboz Bi polar Stepper Motor. The Microcontroller is powered up by 5V and 3.3V and the Stepper motor interface is connected to the 5V Power domain.

I am a little new to this stepper motor working.

This is the connection between the Microcontroller and the stepper motor :




There is also another same stepper motor for the "SPEED" net but I am showing only for the Tacho net.

The input to the COS+, COS- pins of the Stepper are 15kHz, 50% duty cycle PWM Input and the rise time & fall time of the signals is in the order of 30ns-40ns

All I want to understand is the how to calculate - how much current does the motor consume during the normal condition? How to calculate the current consumption of this bipolar stepper motor which takes the current from the Microcontroller pins? I am trying to calculate the maximum output current of the Microcontroller through its output ports.

Hi,

according to the MPC5606S datasheet the SMD (Stepper Motor Driver) pins provide additional current capability to drive stepper motor loads. I had a short look on the datasheet, and I was not able to find an actual current rating (I have no experince with MCUs from NXP). Nevertheless, the current ratings stated in the motor's datasheet are pretty high, and I doubt the MCU can provide such high currents even for the lowest stated motor current. The MCU will not withstand the "short" presented by the motor. You need a dedicated stepper motor driver board/IC.

BR

Hi,

Usually when the datasheet gives not full description, then there will be additional documents.

An NXP search shows 32 MPC5606 related documents. Besides the datasheet there are
* application notes
* reference manuals
* user guides
* quick start guides
* ... others


They are for free and reliable..
It took much effort for the manufacturer to create them ... especially for you ... so use them ;-)

Klaus

Besides this you need to understand stepper motor operation.
* to make a stepper move you need to ramp up the (fundamental) motor coil frequency and the phase needs to be 90° shifted from coil to coil.
* motor coil current and U-I phase shift depends on a lot of things ... like RPM and torque.