I/O Current Injection Characteristics; Table 39. Electrical Sensitivities; Table 40. I/O Current Injection Susceptibility - STMicroelectronics STM32L100RC Manual

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Electrical characteristics
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.
Symbol
LU
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
above V
DD
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, LCD levels).
The test results are given in the
Symbol
I
INJ
1. It is recommended to add a Schottky diode (pin to ground) to analog pins which may potentially inject
negative currents.
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Table 39. Electrical sensitivities

Parameter
Static latch-up class
(for standard pins) should be avoided during normal product operation.
Table

Table 40. I/O current injection susceptibility

Description
Injected current on all 5 V tolerant (FT) pins
Injected current on BOOT0
Injected current on any other pin
DocID024995 Rev 4
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Conditions
= +105 °C conforming to JESD78A
T
A
40.
Functional susceptibility
Negative
injection
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Positive
injection
(1)
-5 NA
-0 NA
(1)
-5 +5
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Class
II level A
or
SS
Unit
mA