Datasheet

Electrical parameters STM8L151x2, STM8L151x3
72/112 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 V
SS
or
above V
DD
(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 V
DD
and T
A
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
I
INJ
Injected current on true open-drain pins (PC0 and
PC1)
-5 +0
mA
Injected current on all five-volt tolerant pins -5 +0
Injected current on all 3.6 V tolerant pins -5 +0
Injected current on any other pin -5 +5