STM8L151F3P6 datasheet(72/112 Pages) STMICROELECTRONICS

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Electrical parameters

STM8L151x2, STM8L151x3

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Doc ID 018780 Rev 4

7.3.6

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 susceptibilty 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: ADC1 error, out of spec current

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

deviation, etc.).

The test results are given in the following table.

7.3.7

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 33.

I/O current injection susceptibility

Symbol

Description

Functional susceptibility

Unit

Negative

injection

Positive

injection

IINJ

Injected current on true open-drain pins (PC0 and

PC1)

-5

Injected current on all five-volt tolerant pins

-5

Injected current on all 3.6 V tolerant pins

-5

Injected current on any other pin

-5

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