Web Site: www.parallax.com Office: (916) 624-8333 Forums: forums.parallax.com Fax: (916) 624-8003 Sales: sales parallax.com Sales: (888) 512-1024 Technical: support parallax.com Tech Support: (888) 997-8267 Pololu Dual MC33926 Motor Driver Carrier The dual MC33926 motor driver carrier is a breakout board featuring two Freescale MC33926 H-bridge ICs. It can supply up to almost 3 A continuous current per channel to two brushed DC motors at 5 28 V, and it can tolerate peak currents up to 5 A per channel for a few seconds, making this a great general- purpose motor driver for medium-sized DC motors and for differential-drive robots that use such motors.. Features Breakout board for Freescale s MC33926 full H-Bridge Delivers 3A continuously to each of it s two motor channels Current feedback, and under-voltage protection Over-current and over-temperature protection Reverse voltage protection on motor voltage (Logic voltage does not have reverse protection) Key Specifications Power Requirements: 5 to 28VDC Communication Interface: 3-5V TTL, PWM(up to 20kHz) Pictures Courtesy of Pololu Operating temperature: -40C to 125C Dimensions: 1.10 x 1.8 (Without included hardware) Application Ideas Robotics DC Motor Control Precautions This product can get hot enough to burn you long before the chip overheats. Table of Contents Features ......................................................... 1 Protection ....................................................... 3 Key Specifications ........................................... 1 Absolute Maximum Ratings .............................. 4 Application Ideas ............................................ 1 Pin Definitions and Ratings .............................. 4 Precautions ..................................................... 1 Connection Diagrams ...................................... 5 Packing List .................................................... 2 Module Dimensions ......................................... 5 Additional Items Required ............................... 2 Resources and Downloads ............................... 5 General Specifications ..................................... 2 Schematic ....................................................... 6 Basic Application Connections .......................... 2 Copyright Parallax Inc. Pololu Dual MC33926 ( 28820) v1.0 11/18/2011 Page 1 of 6 Packing List (1) MC33926 Dual Carrier Board 25-pin Straight Breakaway male Header (3) 2-pin 3.5mm Terminal Blocks Additional Items Required Soldering Iron and solder Safety glasses Heat sink (optional) General Specifications Motor Driver: MC33926 Motor Channels: 2 Minimum Operating Voltage: 5V Maximum Operating Voltage: 28V Continuous Output Current per Channel: 2.5A Current Sense: 0.525V/A Maximum PWM Frequency: 20 kHz Minimum Logic Voltage: 2.5V Maximum Logic Voltage: 5.5V Reverse Voltage Protection : YES Notes: 1) Operation from 5-8V reduces maximum current output. 2) The device is protected from transients up to 40V. 3) The Continuous output current can be improved with the addition of a heat sink. 4) SLEW pin should be HIGH for frequencies above 10kHz. 5) Voltage protection is on Motor Voltage only, Logic Voltage does not have reverse protection. Basic Application Connections In a typical application, five I/O lines are used to connect each motor driver channel to a microcontroller: the two input lines, IN1 and IN2, for direction control, one of the disable lines, D1 or D2, for PWM speed control, the current sense output, FB, for monitoring motor current draw (connected to an analog-to-digital converter input) and the status flag, SF, for monitoring motor driver errors. The control lines can be reduced to two pins per channel if PWM signals are applied directly to the two input pins with both disable pins held inactive. In each of these cases, the other unused lines must be set to enable proper operation. Copyright Parallax Inc. Pololu Dual MC33926 ( 28820) v1.0 11/18/2011 Page 2 of 6