Datasheet

Electrical characteristics STM32F070xB STM32F070x6
60/88 DocID027114 Rev 2
6.3.13 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
DDIOx
(for standard, 3.3 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 (higher
than 5 LSB TUE), out of conventional limits of induced leakage current on adjacent pins (out
of the -5 μA/+0 μA range) or other functional failure (for example reset occurrence or
oscillator frequency deviation).
The characterization results are given in Table 45.
Negative induced leakage current is caused by negative injection and positive induced
leakage current is caused by positive injection.
6.3.14 I/O port characteristics
General input/output characteristics
Unless otherwise specified, the parameters given in Table 46 are derived from tests
performed under the conditions summarized in Table 21: General operating conditions. All
I/Os are designed as CMOS- and TTL-compliant (except BOOT0).
Table 45. I/O current injection susceptibility
Symbol Description
Functional
susceptibility
Unit
Negative
injection
Positive
injection
I
INJ
Injected current on BOOT0 and PF1 pins -0 NA
mA
Injected current on PA9, PB3, PB13, PF11 pins with induced
leakage current on adjacent pins less than 50 μ
A
-5 NA
Injected current on PA11 and PA12 pins with induced
leakage current on adjacent pins less than -1 mA
-5 NA
Injected current on all other FT and FTf pins -5 NA
Injected current on PB0 and PB1 pins -5 NA
Injected current on PC0 pin -0 +5
Injected current on all other TTa, TC and RST pins -5 +5
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