Motherboard Design Guide
Design Guidelines
maxon motor control
EPOS4 Positioning Controller
Document ID: rel8003
4-77
EPOS4 Module/Compact 50/5 Hardware Reference
Edition: May 2018
© 2018 maxon motor. Subject to change without prior notice.
4.2
Design Guidelines
The following instructions are intended to serve as an aid when designing an application-specific moth-
erboard and ensures the correct and reliable integration of the Module.
While designing a motherboard, consider the following characteristics of the Module:
•
Pin assignment (
•
Technical data (
page 2-11) and dimensional drawing (
4.2.1
Ground
All ground connections (GND) should be internally connected to the Module (equal potential). It is cus-
tomary to equip the motherboard with a ground plane. All ground connections should be connected to
the voltage supply ground via wide conductive tracks.
Table 4-66
Motherboard Design Guide – Grounding
If an earth potential is in place or required, the ground plane should be connected to the earth potential
via one or more capacitors. The use of ceramic capacitors with 100 nF and 100 V is recommended.
4.2.2
Layout
Guidelines for the layout of the motherboard:
•
Connector pins [A23], [A24], [A25], [A26], [A27], [A28], and [A29] for +V
CC
(nominal power sup-
ply voltage) should be connected to the fuse via wide conductive tracks.
•
Connector pins [A30], [A31], [A32], [A33], [A34], [A35], [A36], [B16], [B37], and [B38] for GND
(ground) should be connected with the operating voltage ground via wide conductive tracks.
•
Connector pin [B39] (DSP_RxD) must be connected to [A40] (sensor supply voltage; V
Sensor
)
when RS232 is not in use.
•
The width of the conductive tracks and the copper coating thickness of the conductors for sup-
ply voltage and motor depend on the current required in your application. A minimum track
width of 75 mil and a minimum copper coating thickness of 35 μm are recommended.
Pin
Signal
Description
A30…A36
GND
Ground
B16
GND
Ground
B37…B38
GND
Ground