ST7LCR

20/29

4.7.2

Electromagnetic 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.

4.7.3

Absolute maximum ratings (electrical sensitivity)

Based on three different tests (ESD, LU and DLU) using specific measurement methods, the

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

For more details, refer to the application note AN1181.

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 pin). The Human

Body Model is simulated. This test conforms to the JESD22-A114A standard.

Static and dynamic latch-up

●

LU: 3 complementary static tests are required on 10 parts to assess the latch-up

performance. A supply overvoltage (applied to each power supply pin) and a current

injection (applied to each input, output and configurable I/O pin) are performed on each

sample. This test conforms to the EIA/JESD 78 IC latch-up standard. For more details,

refer to the application note AN1181.

●

DLU: Electrostatic discharges (one positive then one negative test) are applied to each

pin of 3 samples when the micro is running to assess the latch-up performance in

dynamic mode. Power supplies are set to the typical values, the oscillator is connected

Table 18.

EMI characteristics

Symbol

Parameter

Conditions

Monitored

Frequency

Band

Max vs.

(1)

1.

Data based on characterization results, not tested in production.

Unit

4/8MHz 4/4MHz

Peak level

conforming to SAE J

1752/3

0.1 MHz to

30 MHz

19

18

dB

µV

30 MHz to

130 MHz

32

27

130 MHz to

1GHz

31

26

SAE EMI Level

4

3.5

-

Table 19.

Absolute maximum ratings

Symbol

Ratings

Conditions

Maximum

1.

Data based on characterization results, not tested in production.

Unit

Electrostatic discharge voltage

(Human body model)

2000

V