User manual

TMCM-1141 Hardware Manual (Rev. 1.02 / 2012-JUL-27) 8
www.trinamic.com
3.2.1 Power and RS485 Connector
A 5pin JST PH-series 2mm pitch single row connector is used for power supply and RS485 serial
communication.
5
1
Pin
Label
Direction
Description
1
GND
Power (GND)
System and signal ground
2
VDD
Power (Supply)
VDD (+9 V… +28 V)
3
GND
Power (GND)
System and signal ground
4
RS485+
Bidirectional
RS485 interface, diff. signal (non-inverting)
5
RS485-
Bidirectional
RS485 interface, diff. signal (inverting)
Table 3.2 Connector for power supply and RS485
3.2.1.1 Power Supply
For proper operation care has to be taken with regard to power supply concept and design. Due to space
restrictions the TMCM-1141 includes about 40µF/35V of supply filter capacitors. These are ceramic
capacitors which have been selected for high reliability and long life time. The module includes a 28V
suppressor diode for over-voltage protection. There is no reverse polarity protection. The module will
short any reversed supply voltage due to the suppressor diode (unidirectional version) and the internal
diodes of the driver transistors.
It is important that the power supply voltage is kept below the upper limit of 28V (please see also
chapter 6). Otherwise the driver electronics might be seriously damaged! Especially, when the selected
operating voltage is near the upper limit a regulated power supply is highly recommended.
It is recommended to connect an electrolytic capacitor of significant size (e.g. 470µF/35V) to the power
supply lines next to the TMCM-1141.
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.