STM8L151M8 datasheet(95/134 Pages) STMICROELECTRONICS

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STM8L15xx8, STM8L15xR6

Electrical parameters

121

9.3.6

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 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, out of spec current

injection on adjacent pins or other functional failure (for example reset, oscillator frequency

deviation, LCD levels, etc.).

The test results are given in the following table.

9.3.7

I/O port pin characteristics

General characteristics

Subject to general operating conditions for VDD and TA unless otherwise specified. All

unused pins must be kept at a fixed voltage: using the output mode of the I/O for example or

an external pull-up or pull-down resistor.

Table 37. I/O current injection susceptibility

Symbol

Description

Functional susceptibility

Unit

Negative

injection

Positive

injection

IINJ

Injected current on true open-drain pins

-5

Injected current on all 5 V tolerant (FT) pins

-5

Injected current on any other pin

-5

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