Datasheet

Electrical characteristics STM32F427xx STM32F429xx
134/239 DocID024030 Rev 10
6.3.16 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 conventional limits of induced leakage current on adjacent pins (out of –
5 µA/+0 µA range), or other functional failure (for example reset, oscillator frequency
deviation).
Negative induced leakage current is caused by negative injection and positive induced
leakage current by positive injection.
The test results are given in Table 55.
Note: It is recommended to add a Schottky diode (pin to ground) to analog pins which may
potentially inject negative currents.
Table 55. I/O current injection susceptibility
(1)
Symbol Description
Functional susceptibility
Unit
Negative
injection
Positive
injection
I
INJ
Injected current on BOOT0 pin − 0NA
mA
Injected current on NRST pin − 0NA
Injected current on PA0, PA1, PA2, PA3, PA6, PA7, PB0,
PC0, PC1, PC2, PC3, PC4, PC5, PH1, PH2, PH3, PH4, PH5
− 0NA
Injected current on TTa pins: PA4 and PA5 − 0+5
Injected current on any other FT pin − 5NA
1. NA = not applicable.
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