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Atmel Electronic Components Datasheet

U6808B Datasheet

Specia Fail-safe IC

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Features
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 40V Load Dump
ESD Protection According to MIL-STD-883 D Test Method 3015.7
– Human Body Model: ±2 kV (100 pF, 1.5 k)
– Machine Model: ±200 V (200 pF, 0)
1. 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 1-1. Block Diagram
VS
Bandgap
reference
+ 2.44 V
-
+
-
Power-on
reset
Reset
debounce
VS
www.DataSheet4U.com
Reset
delay
RESET
RELAY
Special
Fail-safe IC
U6808B
Under/ overvoltage
detection
RIN
WDI
ENABLE
-
+
Internal
oscillator
Current
limitation
+
-
Watchdog
RC
oscillator
GND
WDC
Rev. 4707B–AUTO–10/05


Atmel Electronic Components Datasheet

U6808B Datasheet

Specia Fail-safe IC

No Preview Available !

2. Pin Configuration
Figure 2-1. Pinning SO8
RELAY 1
GND
2
ENABLE 3
WDC
4
8 VS
7 RIN
6 WDI
5 RESET
Table 2-1.
Pin
1
2
3
4
5
6
7
8
Pin Description
Symbol
Type
RELAY
Open collector
driver output
GND
Supply
ENABLE
Digital output
WDC
Analog input
RESET
Digital output
WDI Digital input
RIN Digital input
VS Supply
Function
Fail-safe relay driver
Standard ground
Negative reset signal
External RC for watchdog timer
Negative reset signal
Watchdog trigger signal
Activation of relay driver
5-V supply
Logic
No signal: driver off
Low: driver on
No signal
Low: reset
No signal
Low: reset
Pulse sequence
High: driver on
Low: driver off
2 U6808B
4707B–AUTO–10/05


Part Number U6808B
Description Specia Fail-safe IC
Maker ATMEL Corporation
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U6808B Datasheet PDF






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1 U6808B Specia Fail-safe IC
ATMEL Corporation





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