Datasheet

Electrical characteristics STM32F745xx STM32F746xx
136/227 DocID027590 Rev 4
Designing hardened software to avoid noise problems
EMC characterization and optimization are performed at component level with a typical
application environment and simplified MCU software. It should be noted that good EMC
performance is highly dependent on the user application and the software in particular.
Therefore it is recommended that the user applies EMC software optimization and
prequalification tests in relation with the EMC level requested for his application.
Software recommendations
The software flowchart must include the management of runaway conditions such as:
• Corrupted program counter
• Unexpected reset
• Critical Data corruption (control registers...)
Prequalification trials
Most of the common failures (unexpected reset and program counter corruption) can be
reproduced by manually forcing a low state on the NRST pin or the Oscillator pins for 1
second.
To complete these trials, ESD stress can be applied directly on the device, over the range of
specification values. When unexpected behavior is detected, the software can be hardened
to prevent unrecoverable errors occurring (see application note AN1015).
Electromagnetic Interference (EMI)
The electromagnetic field emitted by the device are monitored while a simple application,
executing EEMBC code, is running. This emission test is compliant with SAE IEC61967-2
standard which specifies the test board and the pin loading.
Table 52. EMI characteristics
Symbol Parameter Conditions
Monitored
frequency band
Max vs.
[f
HSE
/f
CPU
]
Unit
25/200 MHz
S
EMI
Peak level
V
DD
= 3.6 V, T
A
= 25 °C, TFBGA216 package,
conforming to IEC61967-2 ART/L1-cache OFF,
over-drive ON, all peripheral clocks enabled, clock
dithering disabled.
0.1 to 30 MHz - 4
dBµV30 to 130 MHz 9
130 MHz to 1GHz 11
EMI Level 3 -
V
DD
= 3.6 V, T
A
= 25 °C, TFBGA216 package,
conforming to IEC61967-2 ART/L1-cache ON,
over-drive ON, all peripheral clocks enabled, clock
dithering disabled.
0.1 to 30 MHz 4
dBµV30 to 130 MHz 5
130 MHz to 1GHz 14
EMI level 3 -
V
DD
= 3.6 V, T
A
= 25 °C, TFBGA216 package,
conforming to IEC61967-2 ART/L1-cache ON,
over-drive ON, all peripheral clocks enabled, clock
dithering enabled.
0.1 to 30 MHz - 9
dBµV30 to 130 MHz -7
130 MHz to 1GHz -5
EMI level 1.5 -
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