Stepper 16 Click Board™

Product Code: MIKROE-4751

How Does The Stepper 16 Click Board™ Work? The Stepper 16 Click Board™ as its foundation uses the NCV70517, an integrated motor-driver solution for bipolar stepper motors with integrated current sense and current regulation from ON Semiconductor. Two H−bridges are integrated to drive a bipolar stepper motor with a PWM current control loop with on-chip current sensing implemented for each H−bridge. It provides complete output protection, overcurrent protection, and thermal warning and shutdown, alongside with proprietary PWM algorithm used for reliable, current control allowing automatic selection of fast and slow decay. The NCV70517 communicates with MCU using the standard SPI serial interface with a maximum frequency of 10MHz. One of five possible stepping modes is selectable through bits of the SPI registers. After Power−On or hard reset, the coil−current translator, which translates consecutive steps into corresponding currents in both motor coils for a given step mode, is set to the default to 1/16 micro−stepping at position '8'.

Besides the micro−step modes, full step mode is implemented, which always activates only one coil. The direction of rotation is selected by input pin DIR routed to the RST pin of the mikroBUS™ socket and its polarity bit DIRP, which allows changing the direction of rotation through only SPI commands instead of the dedicated input pin. Besides, it also takes the next micro−step depending on the clock signal on the NXT input pin routed to the PWM pin of the mikroBUS™ socket and provides an error message on the ERR pin routed to the INT pin of the mikroBUS™ socket if an electrical error, an undervoltage, or an elevated junction temperature is detected. This Click board™ supports an external power supply for the motor, which can be connected to the input terminal labelled as VEXT and should be within the range of 6V to 29V, while the stepper motor coils can be connected to the terminals labelled as XP, XN, YP, and YN. This Click board™ can be operated only with a 3.3V logic voltage level. Therefore, the board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development. SPECIFICATIONS Type Stepper Applications Can be used for general−purpose stepper motor applications in the automotive, industrial, and applications with fluctuating battery supplies. On-board modules NCV70517 - integrated motor-driver solution for bipolar stepper motors with integrated current sense and current regulation from ON Semiconductor Key Features Dual H−bridge for 2−phase stepper motors, fully integrated current−sensing and current−regulation, integrated current translator, 5 step modes from full-step up to 16 micro-steps, PWM current control with automatic selection of fast and slow decay, and more Interface SPI,GPIO Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V, External PINOUT DIAGRAM This table shows how the pinout on Stepper 16 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 NXT Next micro-step Rotation Direction DIR 2 RST INT 15 INT Error Indicator SPI Chip Select CS 3 CS RX 14 NC SPI Clock SCK 4 SCK TX 13 NC SPI Data OUT SDO 5 MISO SCL 12 NC SPI Data IN SDI 6 MOSI SDA 11 NC Power Supply 3.3V 7 3.3V 5V 10 NC Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description LD1 PWR