Datasheet

Electrical characteristics STM32F427xx STM32F429xx
132/239 DocID024030 Rev 10
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
]
Max vs.
[f
HSE
/f
CPU
]
Unit
25/168 MHz 25/180 MHz
S
EMI
Peak level
V
DD
= 3.3 V, T
A
= 25 °C, LQFP176
package, conforming to SAE J1752/3
EEMBC, ART ON, all peripheral
clocks enabled, clock dithering
disabled.
0.1 to 30 MHz 16 19
dBµV
30 to 130 MHz 23 23
130 MHz to
1GHz
25 22
SAE EMI Level 4 4 -
V
DD
= 3.3 V, T
A
= 25 °C, LQFP176
package, conforming to SAE J1752/3
EEMBC, ART ON, all peripheral
clocks enabled, clock dithering
enabled
0.1 to 30 MHz 17 16
dBµV
30 to 130 MHz 8 10
130 MHz to
1GHz
11 16
SAE EMI level 3.5 3.5 -
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