U6808B Datasheet

IC型號(hào)：
U6808B
PDF描述：
Special Fail-safe IC
文件大?。?/label>
167.22KB
PDF頁(yè)數(shù)：
12頁(yè)
芯片廠家：
ATMEL

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Features

鈥?/div>

Digital Self-supervising Watchdog with Hysteresis

One 250-mA Output Driver for Relay

Enable Output Open Collector 8 mA

Over/Undervoltage Detection

ENABLE and RELAY Outputs Protected Against Standard Transients

and 40 V Load Dump

鈥?/div>

ESD Protection According to MIL-STD-883 D Test Method 3015.7

鈥?Human Body Model: 鹵2 kV (100 pF, 1.5 kW)

鈥?Machine Model: 鹵200 V (200 pF, 0

Special

Fail-safe IC

U6808B

Description

The U6808B is designed to support the fail-safe function of a safety critical system

(e.g., ABS). It includes a relay driver, a watchdog controlled by an external R/C-net-

work and a reset circuit initiated by an over and undervoltage condition of the 5-V

supply providing a low-level reset signal.

Figure 1.

Block Diagram

Bandgap

reference

2.44 V

Power-on

reset

RESET

Reset

debounce

RELAY

Reset

delay

Under/ overvoltage

detection

ENABLE

RIN

Internal

oscillator

Watchdog

oscillator

Current

limitation

WDI

GND

WDC

Rev. 4707A鈥揂UTO鈥?5/03

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U6808B Datasheet

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