ST72C254G2 datasheet(113/135 Pages) STMICROELECTRONICS

Numer części	ST72C254G2

Szczegółowy opis	8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, I2C INTERFACES

PDF	135 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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113 / 135 page

ST72104G, ST72215G, ST72216G, ST72254G

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EMC CHARACTERISTICS (Cont’d)

True Open Drain Pin Protection

The centralized protection (4) is not involved in the

discharge of the ESD stresses applied to true

open drain pads due to the fact that a P-Buffer and

diode to VDD are not implemented. An additional

local protection between the pad and VSS (5a &

5b) is implemented to completly absorb the posi-

tive ESD discharge.

Multisupply Configuration

When several types of ground (VSS,VSSA, ...) and

power supply (VDD,VDDA, ...) are available for any

reason (better noise immunity...), the structure

shown in Figure 76 is implemented to protect the

device against ESD.

Figure 74. Positive Stress on a True Open Drain Pad vs. VSS

Figure 75. Negative Stress on a True Open Drain Pad vs. VDD

Figure 76. Multisupply Configuration

VDD

VSS

(1)

(2b)

(4)

OUT

VDD

VSS

(3b)

Main path

Path to avoid

(5a)

(5b)

VDD

VSS

(1)

(2b)

(4)

OUT

VDD

VSS

(3b)

Main path

(3b)

VDDA

VSSA

VDDA

VDD

VSS

BACK TO BACK DIODE

BETWEEN GROUNDS

VSSA

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