Datasheet

DS10668 Rev 6 79/126
STM32L031x4/6 Electrical characteristics
96
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.
6.3.12 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
DD
(for standard pins) must 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.
Functional susceptibility to I/O current injection
While a simple application is executed on the device, the device is stressed by injecting
current into the I/O pins programmed in floating input mode. While current is injected into
the I/O pin, one at a time, the device is checked for functional failures.
The failure is indicated by an out of range parameter: ADC error above a certain limit (higher
than 5 LSB TUE), out of conventional limits of induced leakage current on adjacent pins (out
of –5 µA/+0 µA range), or other functional failure (for example reset occurrence oscillator
frequency deviation).
The test results are given in the Table 52.
Table 51. Electrical sensitivities
Symbol Parameter Conditions Class
LU Static latch-up class T
A
= +125 °C conforming to JESD78A II level A
Table 52. I/O current injection susceptibility
Symbol Description
Functional susceptibility
Unit
Negative
injection
Positive
injection
I
INJ
Injected current on BOOT0 –0 NA
(1)
1. Current injection is not possible.
mA
Injected current on PA0, PA2, PA4, PA5,
PC15, PH0 and PH1
–5 0
Injected current on any other FT and FTf
pin
–5
(2)
2. It is recommended to add a Schottky diode (pin to ground) to analog pins which may potentially inject
negative currents.
NA
(1)
Injected current on any other pin –5
(2)
+5
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