ST72C171 datasheet(128/152 Pages) STMICROELECTRONICS

No de pièce	ST72C171

Description	8-BIT MCU with 8K FLASH, ADC, WDG, SPI, SCI, TIMERS SPGAs Software Programmable Gain Amplifiers, OP-AMP

PDF	152 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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ST72C171

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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 80 is implemented to protect the

device against ESD.

Figure 78. Positive Stress on a True Open Drain Pad vs. VSS

Figure 79. Negative Stress on a True Open Drain Pad vs. VDD

Figure 80. 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

ST72C171 Fiches technique(PDF) 128 Page - STMicroelectronics

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