The internal ESD diodes of the microcontroller are designed for short discharge pulses only, and these do not sustain a constant
current over time. Therefore, the maximum continuous voltage that drops over them is specified in the DC electrical parameters
and the maximum high input voltage should not be higher than VDD + 0.5 V, and the current injection also should be limited as
defined in the device data sheet. In other words, the voltage and current of an input signal must be within the electrical parameter
allowed. The outcome of violating these specifications causes unexpected behavior, stuck operation or a major damage in
the MCU.
10 References
1.
Hardware Design Guidelines for S32K1xx Microcontrollers
(document AN5426)
2.
LPC55S1x User manual
(document UM11295)
3.
LPC55S2x/LPC552x/LPC55S6x/LPC556x User manual
(document UM11126)
11 Revision history
Rev. Date Description
0 30 October 2020 Initial release
NXP Semiconductors
References
Hardware Design Guidelines for LPC55(S)xx Microcontrollers, Rev. 0, 30 October 2020
Application Note 23 / 24
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