STM32F051R6T6 Datasheet, PDF (67/104 Pages) STMicroelectronics – Low- and medium-density advanced ARM-based 32-bit MCU

Electrical characteristics
STM32F051x
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.
Table 48. Electrical sensitivities
Symbol
Parameter
Conditions
LU
Static latch-up class T_A = +105 °C conforming to JESD78A
Class
II level A
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, 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 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 (>5
LSB TUE), out of conventional limits of current injection on adjacent pins (lower than –5 µA
or lower than − 10 µA), or other functional failure (for example reset, oscillator frequency
deviation).
The characterization results are given in Table 49.
Table 49. I/O current injection susceptibility
Symbol
Description
Functional susceptibility
Negative
Positive
Unit
injection
injection
Injected current on BOOT0, PF0-OSC_IN
and PF1-OSC_OUT pins
–0
NA
Injected current on PA10, PA12, PB4, PB5,
PB10, PB15 and PD2 with current injection
–5
on adjacent pins > –5 µA and <–10 µA
I_INJ
Injected current on other FT and FTf pins
with current injection on adjacent pins
–5
<–5 µA
Injected current on PA6 and PC0 pins
–0
Injected current on all other TTa pins
–5
NA
mA
NA
+5
+5
Injected current on TC and RST pins
–5
+5
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Doc ID 022265 Rev 3