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STM32F031x4 STM32F031x6
Electrical characteristics
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6.3.12 Electrical
sensitivity characteristics
Based on three different tests (ESD, LU) using specific measurement methods, the device is
stressed in order to determine its performance in terms of electrical sensitivity.
Electrostatic discharge (ESD)
Electrostatic discharges (a positive then a negative pulse separated by 1 second) are
applied to the pins of each sample according to each pin combination. The sample size
depends on the number of supply pins in the device (3 parts × (n+1) supply pins). This test
conforms to the JESD22-A114/C101 standard.
Static latch-up
Two complementary static tests are required on six parts to assess the latch-up
performance:
A supply overvoltage is applied to each power supply pin.
A current injection is applied to each input, output and configurable I/O pin.
These tests are compliant with EIA/JESD 78A IC latch-up standard.
6.3.13 I/O
current
injection characteristics
As a general rule, current injection to the I/O pins, due to external voltage below V
SS
or
above V
DDIOx
(for standard, 3.3 V-capable I/O pins) should be avoided during normal
product operation. However, in order to give an indication of the robustness of the
microcontroller in cases when abnormal injection accidentally happens, susceptibility tests
are performed on a sample basis during device characterization.
Table 43. ESD absolute maximum ratings
Symbol
Ratings
Conditions
Packages
Class
Maximum
value
(1)
Unit
V
ESD(HBM)
Electrostatic discharge voltage
(human body model)
T
A
+25 °C, conforming
to JESD22-A114
All
2
2000
V
V
ESD(CDM)
Electrostatic discharge voltage
(charge device model)
T
A
+25 °C, conforming
to ANSI/ESD STM5.3.1
All
C4
500
V
1.
Data based on characterization results, not tested in production.
Table 44. Electrical sensitivities
Symbol
Parameter
Conditions
Class
LU
Static latch-up class
T
A
+105 °C conforming to JESD78A
II level A
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