STM32H747AI datasheet(153/252 Pages) STMICROELECTRONICS

153 / 252 page

DS12930 Rev 1

143/242

STM32H747xI/G

Electrical characteristics

221

As a consequence, it is recommended to add a serial resistor (1 k

Ώ) located as close as

possible to the MCU to the pins exposed to noise (connected to tracks longer than 50 mm

on PCB).

Designing hardened software to avoid noise problems

EMC characterization and optimization are performed at component level with a typical

application environment and simplified MCU software. It should be noted that good EMC

performance is highly dependent on the user application and the software in particular.

Therefore it is recommended that the user applies EMC software optimization and

prequalification tests in relation with the EMC level requested for his application.

Software recommendations

The software flowchart must include the management of runaway conditions such as:

•

Corrupted program counter

•

Unexpected reset

•

Critical Data corruption (control registers...)

Prequalification trials

Most of the common failures (unexpected reset and program counter corruption) can be

reproduced by manually forcing a low state on the NRST pin or the Oscillator pins for 1

second.

To complete these trials, ESD stress can be applied directly on the device, over the range of

specification values. When unexpected behavior is detected, the software can be hardened

to prevent unrecoverable errors occurring (see application note AN1015).

Electromagnetic Interference (EMI)

The electromagnetic field emitted by the device are monitored while a simple application,

executing EEMBC code, is running. This emission test is compliant with SAE IEC61967-2

standard which specifies the test board and the pin loading.

Table 67. EMI characteristics

Symbol Parameter

Conditions

Monitored

frequency band

Max vs.

[fHSE/fCPU]

Unit

8/400 MHz

SEMI

Peak level

VDD = 3.6 V, TA = 25 °C, UFBGA240 package,

conforming to IEC61967-2

0.1 to 30 MHz

dBµV

30 to 130 MHz

130 MHz to 1 GHz

1 GHz to 2 GHz

EMI Level

2.5

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