STM32H523VCU6 datasheet(125/228 Pages) STMICROELECTRONICS

125 / 228 page

DS14540 Rev 1

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STM32H523xx

Electrical characteristics

197

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 (such as 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 or on the oscillator pins for 1 s.

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 “Software

techniques for improving microcontrollers EMC performance”).

Electromagnetic Interference (EMI)

The electromagnetic field emitted by the device is 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 52. EMI characteristics

Symbol Parameter

Conditions

Monitored

frequency band

Max vs.

[fHSE/fCPU]

Unit

8/250 MHz

SEMI

Peak

level(1)

VDD = 3.6 V, TA = 25 °C, LQFP144 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

1. Refer to the EMI radiated test chapter of application note AN1709 “EMC design guide for STM8, STM32 and Legacy

MCUs” available from the ST website www.st.com.

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