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U6809B Datasheet

  • U6809B

  • FAIL-SAFE IC WITH RELAY DRIVER AND LAMP DRIVER

  • 16頁

  • ATMEL   ATMEL

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Features
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Digital Self-supervising Watchdog with Hysteresis
Three 250-mA Output Drivers
One Relay Driver, Two Lamp Drivers
Lamp Drivers with Auxiliary Ground
Lamp Drivers Short-circuit Protected
Lamp Drivers with Status Feedback
Enable Output
Over-/Undervoltage Detection and Reset
All Power Outputs Protected Against Standard Transients
All Power Outputs Protected Against 40-V Load Dump
Automatically Activated Lamp Drivers if V
S
is Disconnected
Automatically Activated Lamp Drivers Via AUX GND if Standard
Ground is Disconnected
Fail-safe IC with
Relay Driver
and Lamp
Driver
U6809B
Description
The U6809B is designed to support the fail-safe function of safety-critical systems
such as ABS. It includes a relay driver, two independent short-circuit-protected lamp
drivers which are supplied by redundant ground lines, two monitoring circuits for the
lamp driver output voltage and output current, a watchdog controlled by an external
RC network and a reset circuit initiated by an over- and undervoltage condition of the
5-V supply providing a positive and a negative reset signal.
Rev. 4764A鈥揂UTO鈥?0/03

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