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Dual MC33926 Motor Driver Shield for Arduino

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Pololu Dual MC33926 Motor Driver Shield for Arduino

Art.Nr.:

EXP-R25-156

Lagerbestand:

5 Stück

33,27
EUR
inkl. 19% MwSt. zzgl. Versand

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This motor driver shield and its
corresponding Arduino library make it easy to control two bidirectional, brushed
DC motors with an Arduino or Arduino clone. The board features a pair of
Freescale MC33926 motor drivers, which operate from 5 to 28 V and can deliver a
continuous 3 A per channel, and includes current sense circuitry, protection
resistors, a FET for reverse battery protection, and logic gates to reduce the
required number of I/O pins. It ships fully populated with its SMD components,
including the two MC33926 ICs, as shown in the picture to the right; stackable
Arduino headers and terminal blocks for connecting motors and motor power are
included but are not soldered in (see the Included Hardware section
below).

This versatile motor driver is intended
for a wide range of users, from beginners who just want a plug-and-play motor
control solution for their Arduinos (and are okay with a little soldering) to
more advanced users who want a dual MC33926 carrier that requires fewer I/O pins to
control. The Arduino pin mappings can all be customized if the defaults are not
convenient, and the simplified MC33926 control lines are broken out along the
left side of the board, providing a convenient interface point for other
microcontroller boards (see the right connection diagram below). This
versatility, along with an option to power the Arduino directly from the shield,
sets this board apart from similar competing motor shields.

Using the dual MC33926
motor driver shield
Using the dual
MC33926 motor driver shield

with an Arduino (shield and Arduino powered
separately).           with
a microcontroller (gray connections are optional).

For a higher-power alternative to this
shield, please consider the Pololu dual VNH5019 motor driver shield, which can deliver a
continuous 12 A per channel.

Features:

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

Detailed user’s guide

Reverse-voltage protection on motor
supply 3

Robust drivers:

Transient operation 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.

Included Hardware:

Pololu
dual MC33926 motor driver shield for Arduino with included
hardware.

This motor driver board ships with
all of the surface-mount parts populated. However, soldering is required for
assembly of the included through-hole parts. The following through-hole parts
are included:

one extended/stackable 1×10 female
header (for Arduino shields)

two extended/stackable 1×8 female
headers (for Arduino shields)

two extended/stackable 1×6 female
headers (for Arduino shields)

three 2-pin, 5 mm terminal blocks (for
board power and motor outputs)

25-pin 0.1″ straight breakaway male
header

A 0.1″ shorting block (for optionally
supplying shield power to Arduino) is also included.

You can solder the terminal blocks to
the six large through-holes to make your motor and motor power connections, or
you can break off a 12×1 section of the 0.1″ header strip and solder it into the
smaller through-holes that border these larger holes. You can also solder wires
directly to the board.

When not using this board as an Arduino
shield, you can solder the 0.1″ headers to the logic connections along the left
side of the board to enable use with custom cables or solderless breadboards, or
you can solder wires directly to the board for more compact installations. Note
that motor and motor power connections should not be made through a
breadboard.

The mounting hole is intended for use
with #4 screws (not included).

An Arduino is not
included.

Schematic
Diagram:

Schematic diagram for the Dual MC33926 Motor Driver
Shield for Arduino.

PDF of schematic: dual MC33926 motor driver shield schematic (350k
pdf).

Real-World Power Dissipation
Considerations:

Each MC33926 motor driver IC has a
maximum continuous current rating of 5 A. However, the actual current it can
deliver depends on how well you can keep it cool. The shield’s printed circuit
board is designed to draw heat out of the motor driver chips, but performance
can be improved by adding heat sinks.

Unlike other H-Bridges, the MC33926 has
a feature that allows it to gracefully reduce current as the current exceeds 5 A
or as the chip temperature approaches its limit. This means that if you push the
chip close to its limit, you will see less power to the motor, but it might
allow you to avoid a complete shutdown.

We tested the shield at room temperature
with no forced air flow or heat sinks. In our tests, the shield was able to
deliver 5 A to both channels simultaneously for 10 s before the thermal
protection started reducing the current. The shield delivered 4 A on both
channels for 37 s, and at 3 A it was able to operate continuously for over 10
minutes without triggering current limiting or thermal protection.

Our tests were conducted at 100% duty
cycle; PWMing the motor will introduce additional heating proportional to the
frequency.

This product can get hot
enough to burn you long before the chip overheats. Take care when handling this
product and other components connected to it.

Dimensions:

Size:

1.90″
× 2.02″ × 0.38″1

Weight:

10
g1

Specifications:

Motor
driver:

MC33926

Motor
channels:

2

Minimum
operating voltage:

5
V2

Maximum
operating voltage:

28
V3

Continuous
output current per channel:

3
A4

Current
sense:

0.525
V/A

Maximum
PWM frequency:

20
kHz

Minimum
logic voltage:

2.5
V

Maximum
logic voltage:

5.5
V

Reverse
voltage protection?:

Y5

Notes:

1.Without included
hardware.

2.Operation from 5 - 8 V reduces
maximum current output.

3.The device is protected for
transients up to 40 V.

4.Can be improved by addition of heat
sink or forced air flow.

5.On motor voltage only; logic voltage
does not have reverse protection.

Documents:

Pololu Dual MC33926 Motor Driver Shield User’s
Guide

MC33926 H-Bridge Datasheet

Dual MC33926 motor driver shield schematic

Arduino library for the Pololu Dual MC33926 Motor Driver
Shield

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