Data Sheet
MD04 - 24Volt 20Amp H Bridge Motor Drive
Overview
The MD04 is a medium power motor driver, designed to supply power beyond that of any of the low
power single chip H-Bridges that exist. Main features are ease of use and flexibility. The motor's power
is controlled by Pulse Width Modulation (PWM) of the H-Bridge at a frequency of 15khz.
Maximum voltage on the H-Bridge is 60v allowing Motor voltages up to 24vdc.
Control of the module can be any of:
1. I2C bus, up to 8 MD04 modules at unique addresses.
2. 0v-2.5-5v analog input. 0v full reverse, 2.5v center stop, 5v full forward.
3. 0v-5v analog input with separate direction control
4. RC mode. Controlled directly from the RC receiver output.
5. PWM. A simple on board filter means you can use a 0%-100% 20khz or greater instead of
analogue
6. Serial communication at TTL (5V) levels.
Connections
Note - There is no
fuse on the PCB. You
should provide a
25/30A fuse in line
with the +v battery
terminal.
Don't Ignore this,
High currents can be
dangerous!
Two pin jumper for bootloader mode
Control end screw terminal
P1 – SCL/TX/Pin 1
P2 – SDA/RX/Pin 2
G – 0V Ground
Motor end screw terminal
G – 0V ground
M – Motor connection 1
M – Motor connection 2
+V - Positive supply 12V to 24V
Be sure to use cable rated for at least 25/30A for the Battery, Fuse and Motor leads.
LED indication
There are three LED's on the MD04, the first is mounted next to the motor terminal and indicates the
presence of an incoming supply. On the control end of the PCB is a green LED that will light with an
incoming control signal and a red LED for problems, this LED will light when the motor is being
temporarily stopped due to excess temperature or if the speed is being reduced due to over-current.
© Devantech Ltd 12/07/15 MD04 documentation 1/8