STM32F103x8, STM32F103xB
Electrical characteristics
5.3.12
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, 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.
Functional susceptibilty 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 (>5
LSB TUE), out of spec current injection on adjacent pins or other functional failure (for
example reset, oscillator frequency deviation).
The test results are given in
Table 34.
Symbol
I/O current injection susceptibility
Functional susceptibility
Description
Negative
injection
-0
-5
-5
Positive
injection
+0
+0
+5
mA
Unit
Injected current on OSC_IN32,
OSC_OUT32, PA4, PA5, PC13
I
INJ
Injected current on all FT pins
Injected current on any other pin
Doc ID 13587 Rev 15
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