PD-1141 Hardware Manual (Rev. 1.04 / 2013-JUL-23)
14
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3.3.3
Step/Direction Connector
A 4pin 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 b5
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
3.3.3.1
Step / Direction / Enable inputs
The inputs Step / Direction / Enable are electrically (optically) isolated from the power supply and all
other signals of the PD-1141. 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
