Stepper 4 Click is a very versatile bipolar stepping motor driver. It features TB67S269FTG IC, fabricated with the BiCD process, allowing the Click board™ to handle significant voltage and current levels up to 35V and 1.2A. This IC has the integrated translator section, used to simplify the control: using simple step control inputs from the host MCU, the stepper motor can be driven in both directions, with the predetermined step sizes from the full step, up to 1/32 step. The TB67S269 IC features high-efficiency motor current control mechanism, resulting with the noiseless operation of the stepper motor with no resonance and ringing, typically observed at unregulated stepper driver designs.
Additional features of the Stepper 4 Click include shoot-through, overcurrent, and thermal protection, so the Click board™ can operate reliably. The Click board™ is equipped with the selectable INT pin, which can report a fault condition or can be used for the electrical angle monitoring. Due to simplicity of the step motor control, as well as the selection of various stepping modes offered by this Click board™, it is a perfect solution for building various applications that require precise and reliable stepper motor control, such as the movement control of beds, heads, and assemblies of various CNC plotting, milling and 3D printer designs.
Stepper Click uses the TB67S269FTG, a bipolar stepper motor driver IC with a translator section, from Toshiba Corporation. This is a highly integrated IC, which offers a very simple bipolar stepper motor control interface, thanks to the integrated translator section. This section controls the output drivers, providing smooth action of the stepper motor. By controlling the current intensity and its decay throughout the rotation cycle, a constant torque is achieved for every position. This IC features high-efficiency motor current control mechanism (Advanced Dynamic Mixed Decay), which results in the optimal ripple while regulating the motor current. The current is limited by the value of the sensing resistor and a reference voltage at the VREF pins. It is possible to adjust the reference voltage via the onboard potentiometer labeled as Torque, from 0V to 3.3V changing the current limit through the motor coils, thus changing the torque. Absolute current limit on this IC is 2A, after which the overcurrent protection is activated.
A LOW to HIGH transition (rising edge) on the CLK pin of the TB67S269FTG IC will perform one rotational step. The direction of the rotation is controlled by the logic state on the CW/CCW pin (routed to the mikroBUS™ AN pin, labeled as DIR). The step size is determined by three pins: DMODE0, DMODE1, and DMODE2. It is possible to work with seven movement step sizes, ranging from full step size up to 1/32 step size. These pins are routed to the DIP switch labeled as STEP MODE, allowing step size to be selected by moving each of them according to the truth table below.
The ENABLE pin allows the host MCU to enable or disable the output stages of the TB67S269FTG IC. Asserting this pin to a HIGH logic level enables the output stage. The RESET pin is used to reset the electrical angle to the initial position and it is active HIGH. The ENABLE pin is routed to the CS (labeled as EN), while the RESET pin is routed to the RST pin of the mikroBUS™, allowing the host MCU to control the IC via these pins.
The TB67S269FTG offers monitoring of the electrical angle and fault condition signaling. These two pins are routed to the SMD jumper labeled as INT SEL. While in MO position, the angle monitoring pin will be routed to the mikroBUS™ INT pin. If the jumper is set at LO position, it will route the LO pin to the INT pin of the mikroBUS™, allowing faulty conditions, such as the thermal failure or overcurrent failure, to be reported. Both of these pins feature a pull-up resistor and will have a LOW logic level when asserted.
This Click board™ can be interfaced with both 3.3V and 5V MCUs, thanks to an SMD jumper, labeled as VCC SEL. It is enough to move the SMD jumper to the appropriate position (3V3 or 5V), and the logic voltage level of the communication signals will be properly set for both types of MCUs.
The Click board™ is equipped with the input and output screw terminals. The terminal labeled as TB1 on the schematic is used to connect the external power supply, which should stay in the range from 10V to 35V. The stepper motor can be connected securely via the TB2 and TB3 screw terminals, with their input terminals labeled as A+, A-, and B+, B-.
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