Safety Requirements And Protective Regulations; Emc; Esd; Operational Safety And Personal Security - TQ-Systems TQMLS1028A Preliminary User's Manual

7.

SAFETY REQUIREMENTS AND PROTECTIVE REGULATIONS

7.1

EMC

The TQMLS1028A 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 TQMLS1028A 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 TQMLS1028A.
The following measures are recommended for a carrier board:
•
Generally applicable:
•
Supply voltages:
•
Slow signals:
•
Fast signals:
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
Permitted Environment temperature
Permitted storage temperature
Relative humidity (operating / storage)
Detailed information concerning the CPUs' thermal characteristics is to be taken from the NXP Reference Manuals (1).
7.5

Reliability and service life

The calculated theoretical MTBF of the TQMLS1028A is (TBD) h @ +40 °C environmental temperature, ground benign.
The TQMLS1028A is designed to be insensitive to vibration and impact.
High quality industrial grade connectors are assembled on the TQMLS1028A.
Preliminary User's Manual l TQMLS1028A UM 0001 l © 2019, TQ-Systems GmbH
Shielding of inputs (shielding connected well to ground / housing on both ends)
Protection by suppressor diode(s)
RC filtering / Zener diode(s)
Integrated protective devices (e.g., suppressor diode arrays)
Range
–40 °C to +85 °C
–40 °C to +100 °C
10 % to 90 %
Remark
–
–
Not condensing
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