Multi Stepper Click is a compact add-on board that contains a bipolar stepper motor driver. This board features the TB67S269FTG, CLOCK-in controlled bipolar stepping motor driver from Toshiba Semiconductor. It supports a PWM constant-current control drive and allows from full-step up to 1/32 steps resolution for less motor noise and smoother control. It has a wide operating voltage range of 10V to 47V with an output current capacity of 1.4A in addition to several built-in error detection circuits. This Click board™ makes the perfect solution for stepping motors in various applications such as office automation, commercial, and industrial equipment.
Multi Stepper Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.
Multi Stepper Click as its foundation uses the TB67S269FTG, a two-phase bipolar stepping motor driver using a PWM chopper (customized by external resistance R2 and capacitor C1) from Toshiba Semiconductor. The TB67S269FTG comes with a built-in clock-in decoder (CLOCK-in controlled), which means that each up-edge of the CLK signal, routed to the PWM pin of the mikroBUS™ socket, will shift the motor’s electrical angle per step. It also incorporates a low on-resistance MOSFET output stage, which can deliver a 1.4A current with a motor output voltage rating of 47V, in addition to integrated protection mechanisms such as over-current and over-temperature detection. In addition, it allows from full-step up to 1/32 steps resolution, with the help of which motor noise can be significantly reduced with smoother operation and more precise control.
As mentioned before, the TB67S269FTG supports various step resolution configurations through its control signals. These control signals are provided through the PCA9555A port expander, which establishes communication with the MCU via the I2C serial interface. This Click board™ also allows a connection of external step-resolution control signals on the onboard header J1 on pins labeled as P1 and P2 for the device’s DMODE1 and DMODE2 control. The PCA9555A also allows choosing the least significant bit (LSB) of its I2C peripheral address by positioning SMD jumpers labeled as ADDR SEL to an appropriate position marked as 0 and 1.
The motor A/B channel current output value can be set manually using an onboard trimmer labeled as VR1, which sets the reference voltage from 0V to 3.3V. The default configuration of the JP4 jumper is the VREF position that sets both channels' output current via the VR1 trimmer. In this case, avoid position P4 on a jumper JP4 since the VREFA pin requires an analog signal for setting.
Also, this Click board™ has a Standby function, activated when all three step-resolution control signals are on its low logic state, used to switch to Standby mode by setting all motor control pins to a low logic state. When the Standby mode is active, the TB67S269FTG stops supplying the power to the internal oscillating circuit and motor output part (the motor drive cannot be performed).
In addition to the I2C communication, several GPIO pins connected to the mikroBUS™ socket are also used. The Enable pin, labeled as EN and routed to the CS pin of the mikroBUS™ socket, optimizes power consumption used for power ON/OFF purposes. Also, a simple rotation direction function routed to the AN pin on the mikroBUS™ socket allows MCU to manage the direction of the stepper motor (clockwise or counterclockwise), while the RST pin of the mikroBUS™ socket initializes an electrical angle in the internal counter to set an initial position.
When it comes to angle monitoring, this driver has a dual way of monitoring selected by positioning SMD jumper labeled as JP5 to an appropriate position marked as P6 or INT, which choose to monitor via expander or INT pin of the mikroBUS™ socket. In the case of the selected INT position of the JP5 jumper, the JP10 jumper needs to be unpopulated. Also, it has an additional LED for anomaly indication. Suppose a state such as an overtemperature or overcurrent is detected. In that case, such anomaly is indicated by a red LED marked as DIAG.
Multi Stepper Click supports an external power supply for the TB67S269FTG, which can be connected to the input terminal labeled as VM and should be within the range of 10V to 47V, while the stepper motor coils can be connected to the terminals labeled as B+, B-, A-, and A+.
This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.
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