User Manual
TMCM-1210 Hardware Manual (V0.91 / 2017-SEP-04) 9
Copyright © 2015, 2016, 2017 TRINAMIC Motion Control GmbH & Co. KG
4.3.2 Motor connector
As motor connector a 4pin JST EH-series 2.5mm 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.
14
Pin
Label
Direction
Description
1
OA1
Output
Pin 1 of motor coil A
2
OA2
Output
Pin 2 of motor coil A
3
OB1
Output
Pin 1 of motor coil B
4
OB2
Output
Pin 2 of motor coil B
Table 4.4: Motor connector
CAUTION
Do not connect or disconnect motor while driver stage is active and supplies current to the motor as
this might permanently damage the driver stage!
4.4 Power supply
For proper operation care has to be taken with regard to power supply concept and design. Due to space
restrictions the TMCM-1210 includes just about 20µF/35V of supply filter capacitors. These are ceramic capacitors
which have been selected for high reliability and long life time.
CAUTION
Add external power supply capacitors!
It is recommended to connect an electrolytic capacitor of significant size (e.g. 470µF/35V) to the power supply
lines next to the TMCM-1210!
Rule of thumb for size of electrolytic capacitor: c = 1000
μF
A
× I
SUPPLY
In addition to power stabilization (buffer) and filtering this added capacitor will also reduce any voltage spikes
which might otherwise occur from a combination of high inductance power supply wires and the ceramic
capacitors. In addition it will limit slew-rate of power supply voltage at the module. The low ESR of ceramic-
only filter capacitors may cause stability problems with some switching power supplies.
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.
Keep the power supply voltage below the upper limit of 30V!
Otherwise the driver electronics will seriously be damaged! Especially, when the selected operating voltage is
near the upper limit a regulated power supply is highly recommended. Please see also chapter 7, operating
values.
No reverse polarity protection!
The module will short any reversed supply voltage due to internal diodes of the driver transistors.