User Manual

TMCM-1240 Hardware Manual • Hardware Version V1.20 | Document Revision V1.20 • 2019-MAY-24

16 / 28

33pF

22k

10k

2k2

+3V3

microcontroller

ENC_A,

ENC_B

+5V

TMCM-1240

+5V

pull-up

enabled

Figure 8: External encoder input

7.5 Step/Direction inputs

The TMCM-1240 may be used as driver with an external motion controller. In this case the Step/Direction

output signals of the external motion controller may be connected to the optically isolated Step/Dir inputs

of the TMCM-1240. Please note that these signals should be 24V signals. For lower voltage signals a simple

small signal transistor maybe inserted as level converter.

680

6k8

2k2

+3V3

microcontroller

TMCM-1240

STEP,

DIR

ISO_COM

+24V_ISO

GND_ISO

Figure 9: Step/Direction input

Due to limitations of the opto-isolators the maximum step frequency of these inputs is limited to around

20kHz. For higher motor speed the step interpolator of the driver stage should be activated or the

microstep resolution reduced (default 256 microsteps per fullstep).

Terms of delivery and rights to technical change reserved.

Download newest version at www.trinamic.com