Product description: DRV8434S stepper motor driver 48 V / 2 A SPI - Pololu 3768
Stepper motor driver module based on the DRV8434S chip from Texas Instruments. It is powered with the voltage in the range from 4.5 V to 48 V. It offers a wide range of step resolution - from full to 1/256 step . The SPI interface is used to adjust the current, step mode, decay mode and stop detection. This version has the maximum current limit fixed at 2A and the SPI can be used to set the actual current limit to any of 16 equally spaced values from 125mA to 2A.
Our offer also includes drivers for stepper motors with different operating parameters.
DRV8434A stepper motor driver 48 V / 2 A - Pololu 3768.
The set includes a goldpin strip.
Main features of the driver
- Single bipolar stepper motor control
- SPI interface
- Ability to work in eleven modes: full step with 100% current, full step with 70% current, part 1/2-, 1/2-, 1/4-, 1/8-, 1/16-, 1/32- , 1/64-, 1/128-, 1/256-step
- Supply voltage range from 4.5 V to 48 V
- Current consumption up to 2 A per coil (1.2 A continuous)
- Protection against overheating, short circuit and exceeding the maximum current
- Uncovered mass field from the bottom for soldering cooling elements
Module connection
The controller requires a motor supply voltage of 4.5 V to 48 V, which must be connected via VIN and GND. Note that supply voltages below 6 V limit the maximum current limit that can be set. The VSDO pin must also be powered with the desired SPI logic voltage. The DRV8434S SPI interface is compatible with 1.8V, 3.3V and 5V systems.
Controller control
One pulse given to the STEP pin corresponds to one step of the stepper motor in the direction given to the DIR pin. The STEP and DIR pins are internally pulled to ground (GND). Therefore, if the motor is only to rotate in one direction, DIR can be left unconnected. Steps and direction can also be controlled by SPI only.
An example of connecting the microcontroller to the DRV8434S controller.
Current limiting
To achieve high stepping speeds, motor power is typically higher than would be acceptable without active current limiting. For example, a typical stepper motor might have a maximum current rating of 1A with a coil resistance of 5Ω, which would indicate a maximum power supply of 5V to the motor. Using such a motor at 9V would allow higher stepping speeds, but the current must be limited to less than 1A to prevent engine damage.
This version has a maximum current limit fixed at 2A, and SPI can be used to set the actual current limit to any of 16 equally spaced values from 125mA to 2A.
Technical Specifications
- Supply voltage: from 4.5 V to 48 V
- Continuous current per coil: 1.2 A
- Maximum instantaneous current per coil: 2 A
- Logic supply voltage: 1.8 V to 5.5 V
- Number of operating modes: 11
- Dimensions: 20x15mm
- Weight: 1.3g
The controller works in 11 modes, from full to 1/256 step.
