STR91XFA datasheet(57/78 Pages) STMICROELECTRONICS

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STR91xFA

Electrical characteristics

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6.12

EMC characteristics

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

6.12.1 Functional EMS (Electro Magnetic Susceptibility)

Based on a simple running application on the product (toggling 2 LEDs through I/O ports), the

product is stressed by two electro magnetic events until a failure occurs (indicated by the

LEDs).

●

ESD: Electro-Static 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, VDDQ and

VSS through a 100pF 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.

Table 21.

EMS data

6.12.2 Electro Magnetic Interference (EMI)

Based on a simple application running on the product (toggling 2 LEDs through the I/O ports),

the product is monitored in terms of emission. This emission test is in line with the norm SAE J

1752/3 which specifies the board and the loading of each pin.

Table 22.

EMI data

Notes:

1. Data based on characterization results, not tested in production.

2. BGA and LQFP devices have similar EMI characteristics.

Symbol

Parameter

Conditions

Neg.

Pos.

Unit

VFESD

Voltage limits to be applied on

any I/O pin to induce a functional

disturbance

VDD=1.8V, VDDQ=3.3V,

TA=+25°C, fOSC/fCPUCLK =4

MHz/96MHz PLL

-1(1)

Data based on characterization results, not tested in production.

>2(1)

VFFTB

Fast transient voltage burst limits

to be applied through 100pF on

VDD and VDDQ pins to induce a

functional disturbance

VDD=1.8V, VDDQ=3.3V,

TA=+25°C, fOSC/fCPUCLK =4

MHz/96 MHz PLL

conforms to IEC 1000-4-4

-4(1)

4(1)

Symbol

Parameter

Conditions

Monitored

Frequency Band

Max vs.

[fOSC/fCPUCLK]

Unit

4 MHz/ 96 MHz

SEMI

Peak level

VDDQ=3.3V, VDD=1.8V,

TA=+25°C,

LQFP128 package

conforming to SAE J

1752/3

0.1MHz to 30 MHz

µV

30 MHz to 130 MHz

130 MHz to 1GHz

SAE EMI Level

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