STM32L433CB datasheet(145/227 Pages) STMICROELECTRONICS

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DS11449 Rev 7

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STM32L433xx

Electrical characteristics

194

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.

6.3.12

Electrical sensitivity characteristics

Based on three different tests (ESD, LU) using specific measurement methods, the device is

stressed in order to determine its performance in terms of electrical sensitivity.

Electrostatic discharge (ESD)

Electrostatic discharges (a positive then a negative pulse separated by 1 second) are

applied to the pins of each sample according to each pin combination. The sample size

depends on the number of supply pins in the device (3 parts × (n+1) supply pins). This test

conforms to the ANSI/JEDEC standard.

Table 66. EMI characteristics for fHSE = 8 MHz and fHCLK = 80 MHz

Symbol Parameter

Conditions

Monitored frequency band

Value

Unit

SEMI

Peak(1)

1. Refer to AN1709 “EMI radiated test” section.

VDD = 3.6 V, TA = 25 °C,

LQFP100 package

compliant with IEC 61967-2

0.1 MHz to 30 MHz

-8

dBµV

30 MHz to 130 MHz

130 MHz to 1 GHz

1 GHz to 2 GHz

Level(2)

2. Refer to AN1709 “EMI level classification” section.

0.1 MHz to 30 MHz

2.5

Table 67. ESD absolute maximum ratings

Symbol

Ratings

Conditions

Class

Maximum

value(1)

1. Guaranteed by characterization results.

Unit

VESD(HBM)

Electrostatic discharge

voltage (human body model)

TA = +25 °C, conforming

to ANSI/ESDA/JEDEC

JS-001

2000

VESD(CDM)

Electrostatic discharge

voltage (charge device

model)

TA = +25 °C,

conforming to ANSI/ESD

STM5.3.1

250

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