STM32L082KB datasheet(82/132 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L082xx

82/132

DS10688 Rev 7

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 is

executed (toggling 2 LEDs through the I/O ports). This emission test is compliant with

IEC 61967-2 standard which specifies the test board and the pin loading.

Table 53. EMI characteristics for fHCLK = 32 MHz

Symbol Parameter

Conditions

Monitored

frequency band

Value

Unit

SEMI

Peak(1)

1. Refer to the EMI radiated test section of the application note AN1709 “EMC design guide for STM8,

STM32 and legacy MCUs”.

VDD = 3.6 V, TA = 25 °C,

compliant with IEC 61967-2

0.1 to 30 MHz

-7

dBµV

30 to 130 MHz

130 MHz to 1 GHz

Level(2)

2. Refer to the EMI level classification section of the application note AN1709 “EMC design guide for STM8,

STM32 and legacy MCUs”

0.1 MHz to 1 GHz

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