STM32F446ME datasheet(117/201 Pages) STMICROELECTRONICS

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STM32F446xC/E

Electrical characteristics

174

These tests are compliant with EIA/JESD 78A IC latchup standard.

6.3.16

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 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 54. Electrical sensitivities

Symbol

Parameter

Conditions

Class

Static latch-up class

TA = +105 °C conforming to JESD78A

II level A

Table 55. I/O current injection susceptibility(1)

Symbol

Description

Functional susceptibility

Unit

Negative

injection

Positive

injection

IINJ

Injected current on BOOT0 pin

–0

Injected current on NRST pin

–0

Injected current on PE2, PE3,PE4, PE5, PE6, PC13, PC14,

PF10, PH0, PH1, NRST, PC0, PC1, PC2, PC3, PG15, PB3,

PB4, PB5, PB6, PB7, PB8, PB9, PE0, PE1

–0

Injected current on any other FT and FTf pins

-5

Injected current on any other pins

–5

1. NA = not applicable

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