Electrical characteristics
STM32F103xx
5.3.10
EMC characteristics
Susceptibility tests are performed on a sample basis during device characterization.
Functional EMS (electromagnetic susceptibility)
While a simple application is executed on the device (toggling 2 LEDs through I/O ports). the
device is stressed by two electromagnetic events until a failure occurs. The failure is
indicated by the LEDs:
■
Electrostatic discharge (ESD) (positive and negative) is applied to all device pins until
a functional disturbance occurs. This test is compliant with the IEC 1000-4-2 standard.
■
FTB: A Burst of Fast Transient voltage (positive and negative) is applied to V and
DD
V
through a 100 pF capacitor, until a functional disturbance occurs. This test is
SS
compliant with the IEC 1000-4-4 standard.
A device reset allows normal operations to be resumed.
The test results are given in Table 25. They are based on the EMS levels and classes
defined in application note AN1709.
(1)
Table 25. EMS characteristics
Level/
Class
Symbol
Parameter
Conditions
V
DD = 3.3 V, TA = +25 °C,
Voltage limits to be applied on any I/O pin to
induce a functional disturbance
VFESD
fHCLK=48 MHz
TBD
4A
conforms to IEC 1000-4-2
Fast transient voltage burst limits to be
applied through 100pF on VDD and VSS pins
to induce a functional disturbance
VDD = 3.3 V, TA = +25 °C,
VEFTB
fHCLK = 48 MHz
conforms to IEC 1000-4-4
1. TBD stands for to be determined.
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...)
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