User manual

TMCM-1141 Hardware Manual (Rev. 1.02 / 2012-JUL-27) 13
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3.2.3 Step/Direction Connector
A 4pin JST PH-series 2mm pitch single row connector is available for the Step/Dir interface. This interface
can be used for connecting an external motion controller to the on-board driver stage instead of the
integrated motion controller.
All three Step/Dir/Enable signals are optically isolated. Therefore, an additional supply input (COMMON) is
available which has to be connected to a supply voltage between +5 V and +24 V for proper operation.
4
1
Pin
Label
Direction
Description
1
COMMON
Power
(Supply input)
Power supply input for the three Step / Direction
/ Enable signals. Accepts voltages between +5V
and +24V nom.
2
/ENABLE
Input
Enable input
(function depends on firmware)
3
STEP
Input
Step pulse input
(connected to step input of TMC262 driver IC)
4
DIRECTION
Input
Direction input
(connected to direction input of TMC262 driver IC)
Table 3.5: Step/Direction connector
3.2.3.1 Step / Direction / Enable inputs
The inputs Step / Direction / Enable are electrically (optically) isolated from the power supply and all
other signals of the TMCM-1141 module. These inputs have one common reference input COMMON (see
Figure 3.7). The COMMON input should be connected to a positive supply voltage between +5V and +24V.
Step / Direction / Enable signals might be driven either by open-collector / open-drain outputs or by
push-pull outputs. In case of push-pull outputs the COMMON supply voltage should be equal / similar to
the high signal voltage level of the push-pull drivers.
8mA
8mA
8mA
+3.3V
GND
Enable
Direction
Step
Common
(5..24V)
microcontroller
TMC262
TMC262
Figure 3.8 Step/Dir/Enable inputs