TMCM-1141 Hardware Manual (Rev. 1.06 / 2015-JAN-09)
15
3.2.4 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 between +5 V and +24 V for proper operation.
Pin
Label
Direction
Power
(Supply input)
Description
COMMON
Power supply input for the three Step / Direction
/ Enable signals. Accepts voltages between +5V
and +24V nom.
1
4
1
/ENABLE
STEP
Input
Enable input
(function depends on firmware)
Step pulse input
(connected to step input of TMC262 driver IC)
Direction input
2
3
4
Input
DIRECTION Input
(connected to direction input of TMC262 driver IC)
Table 3.6: Step/Direction connector
3.2.4.1 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.). 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 (otherwise the LEDs will not be turned off during
signal high-level). There is no need to add external resistors in line with the “Enable”, “Step” or
“Direction” inputs. The internal current sources (Figure 3.8) will adjust the current through the LEDs of
the optical isolation to approx. 8mA for signal input voltages between nom. +5V and +24V.
+3.3V
Common
(5..24V)
microcontroller
8mA
Enable
TMC262
8mA
Step
TMC262
8mA
Direction
GND
Figure 3.9 Step/Dir/Enable inputs
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