TMCM-1141 Hardware Manual (Rev. 1.06 / 2015-JAN-09)
16
3.2.5 Motor Connector
As motor connector a 4pin 2mm pitch single row connector is available. The motor connector is used for
connecting the four motor wires of the two motor coils of the bipolar stepper motor to the electronics.
Pin
Label
OB2
OB1
OA2
OA1
Direction
Output
Output
Output
Output
Description
Pin 2 of motor coil B
Pin 1 of motor coil B
Pin 2 of motor coil A
Pin 1 of motor coil A
1
2
3
4
4
1
Table 3.7 Motor connector
Do not connect or disconnect motor during operation!
Motor cable and motor inductivity might lead to voltage spikes when the motor is
disconnected / connected while energized. These voltage spikes might exceed voltage
limits of the driver MOSFETs and might permanently damage them. Therefore, always
disconnect power supply before connecting / disconnecting the motor.
For hardware version 1.3: please note the additional high current range for motor
currents up-to 2A RMS!
Setting motor current too high might lead to excessive power dissipation inside the
motor, overheating and even permanent damage of the motor. Therefore, make sure the
motor current is properly set. Also with hardware version 1.3 the low current range is
set as default.
green
black
TMCM-1141
QS4218 Motor
A
M
Motor connector pin Cable color
Coil
Description
1
2
3
4
Red
B
Motor coil B pin 1
Motor coil B pin 2
Motor coil A pin 2
Motor coil A pin 1
Blue
Green
Black
B-
A-
A
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