Preliminary User's Manual l TQMaX4XxL UM 0001 l © 2022, TQ-Systems GmbH
Page 32
6.
SAFETY REQUIREMENTS AND PROTECTIVE REGULATIONS
6.1
EMC
The TQMaX4XxL 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 permanent 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)
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 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
TQMaX4XxL.
Following measures are recommended for a carrier board:
•
Generally applicable:
Shielding of the inputs (shielding connected well to ground / housing on both ends)
•
Supply voltages:
Protection by suppressor diode(s)
•
Slow signal lines:
RC filtering, Zener diode(s)
•
Fast signal lines:
Integrated protective devices (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 haven’t been carried out.
6.4
Climatic and operational conditions
The temperature range, in which the TQMaX4XxL works reliably, 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 16:
Climate and operational conditions industrial temperature range
Parameter
Range
Remark
Environmental temperature
–40 °C to +85 °C
With appropriate cooling
Permitted storage temperature
–40 °C to +100 °C
–
Relative humidity (operating / storage)
10 % to 90 %
Not condensing
6.5
Reliability and service life
For the TQMaX4XxL, a constant error rate results in an MTBF of approximately 567,716 hours (TQMa6442) and approximately
627,066 hours (TQMa2443).
Attention must be paid to a construction that is insensitive to vibration and shock.
Service life-limiting components such as electrolytic capacitors were not used.
