User's Manual l TQMa8XxS UM 0101 l © 2022, TQ-Systems GmbH
Page 39
6.
SAFETY REQUIREMENTS AND PROTECTIVE REGULATIONS
6.1
EMC
The TQMa8XxS was developed according to the requirements of electromagnetic compatibility (EMC). Depending on the target
system, anti-interference measures may still be necessary to guarantee the adherence to the limits for the overall system.
Following measures are recommended:
•
Robust ground planes (adequate ground planes) on the printed circuit board
•
A sufficient number of blocking capacitors in all supply voltages
•
Fast or permanently clocked lines (e.g., clock signals) should be kept short;
avoid interference of other signals by distance and/or shielding,
also pay attention to frequencies and signal rise times
•
Filtering of all signals, which can be connected externally
(also "slow signals" and DC can radiate RF indirectly)
•
Direct signal routing without stubs for multi-pole interfaces (e.g. LC display).
As part of the development, an EMC test was performed with the starter kit MB-SMARC-2 REV.02xx in accordance with
EN55022:2010 Class A limits.
6.2
ESD
In order to avoid interspersion on the signal path from the input to the protection circuit in the system, the protection against
electrostatic discharge should be provided directly at the inputs of a system. As these measures always have to be implemented
on the carrier board, no special protective measures were provided on the TQMa8XxS.
The following measures are recommended for a carrier board:
•
Generally applicable:
Shielding of inputs (shielding connected well to ground / housing on both ends)
•
Supply voltages:
Suppressor diodes
•
Slow signals:
RC filtering, Zener diodes
•
Fast signals:
Protection components, e.g., suppressor diode arrays
6.3
Operational safety and personal security
Due to the occurring voltages (
≤
5 V DC), tests with respect to the operational and personal safety have not been carried out.
