STM32F051K4 datasheet(67/104 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F051x

68/105

Doc ID 022265 Rev 3

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.

6.3.12

I/O current injection characteristics

As a general rule, current injection to the I/O pins, due to external voltage below VSS or

above VDD (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 –5µA

or lower than

− 10 µA), or other functional failure (for example reset, oscillator frequency

deviation).

The characterization results are given in Table 49.

Table 48.

Electrical sensitivities

Symbol

Parameter

Conditions

Class

Static latch-up class

TA = +105 °C conforming to JESD78A

II level A

Table 49.

I/O current injection susceptibility

Symbol

Description

Functional susceptibility

Unit

Negative

injection

Positive

injection

IINJ

Injected current on BOOT0, PF0-OSC_IN

and PF1-OSC_OUT pins

–0

Injected current on PA10, PA12, PB4, PB5,

PB10, PB15 and PD2 with current injection

on adjacent pins > –5 µA and <–10 µA

–5

Injected current on other FT and FTf pins

with current injection on adjacent pins

<–5 µA

–5

Injected current on PA6 and PC0 pins

–0

Injected current on all other TTa pins

–5

Injected current on TC and RST pins

–5

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