ST7262 datasheet(110/132 Pages) STMICROELECTRONICS

부품명	ST7262

상세설명	LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS, FLASH OR ROM MEMORY, LVD, WDG, 10-BIT ADC, 2 TIMERS, SCI, SPI

PDF	132 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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ST7262

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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 completely 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 67 is implemented to protect the

device against ESD.

Figure 65. Positive Stress on a True Open Drain Pad vs. VSS

Figure 66. Negative Stress on a True Open Drain Pad vs. VDD

Figure 67. 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

ST7262 데이터시트(PDF) 110 Page - STMicroelectronics

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