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User's Manual l TQMa6x & TQMa6xP UM 0403 l © 2019, TQ-Systems GmbH
Page 45
5.
SOFTWARE
The TQMa6x is delivered with a preinstalled boot loader U-Boot. TQ-Systems GmbH
provides a Board Support Package
which is tailored for the combination of TQMa6x plus MBa6x.
The boot loader U-Boot provides TQMa6x-specific as well as board-specific settings, e.g.:
•
CPU configuration
•
PMIC configuration
•
RAM configuration and timing
•
eMMC configuration
•
Pin multiplexing
•
Clocks
•
Pin configuration
•
Driver strengths
These settings have to be adapted for other bootloaders. More information can be found in the TQMa6x Support Wiki.
6.
SAFETY REQUIREMENTS AND PROTECTIVE REGULATIONS
6.1
EMC
The TQMa6x 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. 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 TQMa6x is used on an application-specific carrier board, EMC or ESD tests only make sense for the whole device.
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 TQMa6x.
Following measures are recommended for a carrier board:
•
Generally applicable:
Shielding of inputs (shielding connected well to ground / housing on both ends)
•
Supply voltages:
Protection by suppressor diode(s)
•
Slow signals:
RC filtering, perhaps Zener diode(s)
•
Fast signals:
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 have not been carried out.