STM32MP157A datasheet(165/259 Pages) STMICROELECTRONICS

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DS12504 Rev 5

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STM32MP157A/D

Electrical characteristics

237

Static latchup

Two complementary static tests are required on three parts to assess the latchup

performance:

•

A supply overvoltage is applied to each power supply pin

•

A current injection is applied to each input, output and configurable I/O pin

These tests are compliant with JESD78 IC latchup standard.

6.3.16

I/O current injection characteristics

As a general rule, a current injection to the I/O pins, due to external voltage below VSS or

above VDD (for standard, 3.3 V-capable I/O pins) should be avoided during the normal

product operation. However, in order to give an indication of the robustness of the device in

cases when an abnormal injection accidentally happens, susceptibility tests are performed

on a sample basis during the 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 (higher

than 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).

The following tables are the compilation of the SIC1/SIC2 and functional ESD results.

Negative induced A negative induced leakage current is caused by negative injection and

positive induced leakage current by positive injection.

6.3.17

I/O port characteristics

General input/output characteristics

Table 50. Electrical sensitivities

Symbol

Parameter

Conditions

Class

Static latchup class

TA = +25 °C conforming to JESD78

II level A

Table 51. I/O current injection susceptibility(1)

Symbol

Description

Negative

injection

Positive

injection

Unit

IINJ

ANA0, ANA1, DSI_D0_P, DSI_D0_N, DSI_CK_P,

DSI_CK_N, DSI_D1_P, DSI_D1_N, PA4, PA5

PG2, PG3, PG4, PH2

N/A

All other FTxx I/Os

N/A

1. Guaranteed by characterization

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