User's Manual l TQMLS10xxA UM 0105 l © 2022, TQ-Systems GmbH
Page 27
7.
SAFETY REQUIREMENTS AND PROTECTIVE REGULATIONS
7.1
EMC
The TQMLS10xxA 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.
The 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) should be kept short;
avoid interference of other signals by distance and / or shielding besides,
take note of not only the frequency, but also the signal rise times.
•
Filtering of all signals, which can be connected externally
(also "slow signals" and DC can radiate RF indirectly).
Since the TQMLS10xxA is plugged on an application-specific carrier board, EMC or ESD tests only make sense for the whole
device.
7.2
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 arranged directly at the inputs of a system. As these measures always have to be implemented
on the carrier board, no special preventive measures were planned on the TQMLS10xxA.
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
7.3
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.
7.4
Climatic and operational conditions
The possible temperature range strongly depends on the installation situation (heat dissipation by heat conduction and
convection); hence, no fixed value can be given for the whole assembly.
In general, a reliable operation is given when following conditions are met:
Table 15: Climate and operational conditions
Parameter
Range
Remark
Ambient temperature
–40 °C to +85 °C
–
Storage temperature
–40 °C to +100 °C
–
Relative humidity (operating / storage)
10 % to 90 %
Not condensing
Detailed information concerning the CPUs’ thermal characteristics is to be taken from the NXP Reference Manuals (1).
7.5
Reliability and service life
No MTBF was calculated for the TQMLS10xxA. The TQMLS10xxA is designed to be insensitive to vibration and impact.
High quality industrial grade connectors are assembled on the TQMLS10xxA.
