STM32WB55CG View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM32WB55CG

Multiprotocol wireless 32-bit MCU Arm®-based Cortex®-M4 with FPU, Bluetooth® 5 and 802.15.4 radio solution

STMicroelectronics 

STM32WB55xx STM32WB35xx

Electrical characteristics

6.3.14

EMC characteristics

Susceptibility tests are performed on a sample basis during device characterization.

Functional EMS (electromagnetic susceptibility)

While a simple application is executed on the device (toggling 2 LEDs through I/O ports).

the device is stressed by two electromagnetic events until a failure occurs. The failure is

indicated by the LEDs:

 Electrostatic discharge (ESD) (positive and negative) is applied to all device pins until

a functional disturbance occurs. This test is compliant with the IEC 61000-4-2 standard.

 FTB: A Burst of Fast Transient voltage (positive and negative) is applied to VDD and

VSS through a 100 pF capacitor, until a functional disturbance occurs. This test is

compliant with the IEC 61000-4-4 standard.

A device reset allows normal operations to be resumed.

The test results are given in Table 67. They are based on the EMS levels and classes

defined in application note AN1709 “EMC design guide for STM8, STM32 and Legacy

MCUs”, available on www.st.com.

Table 67. EMS characteristics

Symbol

Parameter

Conditions

VFESD

VEFTB

Voltage limits to be applied on any I/O pin

to induce a functional disturbance

VDD = 3.3 V, TA = +25 °C, 

fHCLK = 64 MHz,

conforming to IEC 61000-4-2

Fast transient voltage burst limits to be

applied through 100 pF on VDD and VSS

pins to induce a functional disturbance

VDD = 3.3 V, TA = +25 °C, 

fHCLK = 64 MHz,

conforming to IEC 61000-4-4

Level/Class

2B

5A

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 flow must include the management of runaway conditions such as:

 corrupted program counter

 unexpected reset

 critical data corruption (e.g. control registers)

DS11929 Rev 10

131/193

169

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