1.a. Features

Pololu dual MC33926 motor driver shield, assembled and connected to an Arduino Leonardo.

Pololu dual MC33926 motor driver shield for Arduino, bottom view with board dimensions.

• Wide operating voltage range: 5 – 28 V ¹
• Output current: 3 A continuous (5 A peak ²) per motor
• Inputs compatible with both 5 V and 3.3 V systems
• PWM operation up to 20 kHz, which is ultrasonic and allows for quieter motor operation
• Current sense voltage output proportional to motor current (approx. 525 mV/A)
• Motor indicator LEDs show what the outputs are doing even when no motor is connected
• Can be used with an Arduino or Arduino clone (through shield headers) or other microcontroller boards (through 0.1″ header along the left side)
• When used as a shield, the motor power supply can optionally be used to power the Arduino base as well
• Arduino pin mappings can be customized if the default mappings are not convenient
• Arduino library makes it easy to get started using this board as a motor driver shield
• Reverse-voltage protection on motor supply ³
• Robust drivers:
  • Transient operation (< 500 ms) up to 40 V
  • Over-current limiting via internal PWM
  • Over-temperature shutdown and hysteresis
  • Under-voltage shutdown
  • Output short-to-ground and short-to-Vcc protection

¹ The board supports transient (< 500 ms) operation up to 40V. Operation from 5-8 V reduces maximum continuous output current (driver performance is derated in this range).
² Internal peak-current limiting gracefully reduces the output power at load currents above 6.5 A ± 1.5 A. See the MC33926 datasheet (1MB pdf) for more information.
³ There is no reverse-voltage protection on the logic supply.