ST7265X datasheet(138/166 Pages) STMICROELECTRONICS

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ST7265x

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EMC CHARACTERISTICS (Cont’d)

13.7.2 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.

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

13.7.3 Absolute 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, re-

fer to the AN1181 ST7 application note.

13.7.3.1 Electro-Static Discharge (ESD)

Electro-Static Discharges (3 positive then 3 nega-

tive pulses 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 of the device (3 parts*(n+1)

supply pin). One model is simulated: Human Body

Model. This test conforms to the JESD22-A114A

standard. See Figure 80 and the following test se-

quence.

Human Body Model Test Sequence

– CL is loaded through S1 by the HV pulse gener-

ator.

– S1 switches position from generator to R.

– A discharge from CL through R (body resistance)

to the ST7 occurs.

– S2 must be closed 10 to 100ms after the pulse

delivery period to ensure the ST7 is not left in

charge state. S2 must be opened at least 10ms

prior to the delivery of the next pulse.

Absolute Maximum Ratings

Figure 80. Typical equivalent ESD Circuit

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

Symbol

Parameter

Conditions

Monitored

Frequency Band

Max vs. [fOSC/fCPU]

Unit

3MHz

6MHz

SEMI

Peak level

VDD=5V, TA=+25°C,

TQFP64 package

conforming to SAE J 1752/3

0.1MHz to 30MHz

µV

30MHz to 130MHz

130MHz to 1GHz

SAE EMI Level

Symbol

Ratings

Conditions

Maximum value 1)

Unit

VESD(HBM)

Electro-static discharge voltage

(Human Body Model)

TA=+25°C

1500

ST7

R=1500

Ω

HIGH VOLTAGE

CL=100pF

PULSE

GENERATOR

HUMAN BODY MODEL

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