STM32F042F4 datasheet(70/117 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F042x4 STM32F042x6

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DocID025832 Rev 5

Software recommendations

The software flowchart must include the management of runaway conditions such as:

•

Corrupted program counter

•

Unexpected reset

•

Critical Data corruption (for example 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.

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 JESD22-A114/C101 standard.

Table 46. EMI characteristics

Symbol

Parameter

Conditions

Monitored

frequency band

Max vs. [fHSE/fHCLK]

Unit

8/48 MHz

SEMI

Peak level

VDD = 3.6 V, TA = 25 °C,

LQFP48 package

compliant with

IEC 61967-2

0.1 to 30 MHz

-9

dBµV

30 to 130 MHz

130 MHz to 1 GHz

EMI Level

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