ATA6809 Datasheet, PDF (1/16 Pages) ATMEL Corporation – Fail-safe IC with Relay Driver and Lamp Driver

Features
• Digital Self-supervising Watchdog with Hysteresis
• Three 250-mA Output Drivers
• One Relay Driver, Two Lamp Drivers
• Lamp Drivers With Auxiliary Ground
• Short-circuit-protected Lamp Drivers
• Lamp Drivers With Status Feedback
• Enable Output
• Overvoltage/Undervoltage Detection and Reset
• All Power Outputs Protected Against Standard Transients
• All Power Outputs Protected Against 40V Load Dump
• Lamp Drivers Automatically Activated if V_S is Disconnected
• Lamp Drivers Automatically Activated Via AUX GND if Standard
Ground is Disconnected
1. Description
The ATA6809 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 overvoltage or undervoltage condition
of the 5V supply providing a positive and a negative reset signal.
Fail-safe IC with
Relay Driver
and Lamp
Driver
ATA6809
Rev. 4902A–AUTO–11/05