STM8SPLNB1 datasheet(26/44 Pages) STMICROELECTRONICS

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Electrical characteristics

STM8SPLNB1

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DocID018831 Rev 5

4.3.5

EMC characteristics

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

Functional EMS (electromagnetic susceptibility)

While executing a simple application (toggling 2 LEDs through I/O ports), the product is

stressed by two electromagnetic events until a failure occurs (indicated by the LEDs).



ESD: Electrostatic discharge (positive and negative) is applied on all pins of the device

until a functional disturbance occurs. This test conforms with the IEC 1000-4-2

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 conforms

with the IEC 1000-4-4 standard.

A device reset allows normal operations to be resumed. The test results are given in the

table below based on the EMS levels and classes defined in application note AN1709 (EMC

design guide for STMicrocontrollers).

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 application.

Prequalification trials

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

reproduced by manually forcing a low state on the RESET pin for 1 second.

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

specification values.

Table 27. EMS data

Symbol

Parameter

Conditions

Level/class

VFESD

Voltage limits to be applied on any I/O pin

to induce a functional disturbance

VDD 3.3 V, TA 25 °C,

fCPU 16 MHz (HSI clock),

conforming to IEC 1000-4-2

2/B

VEFTB

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,

fCPU 16 MHz (HSI clock),

conforming to IEC 1000-4-4

4/A

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