U6808B 반도체 회로 부품 판매점
Specia Fail-safe IC
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 ATMEL Corporation |
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 kΩ)
– Machine Model: ±200 V (200 pF, 0Ω)
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
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
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PDF 파일 내의 페이지 : 총 14 페이지
제조업체: ATMEL Corporation
( atmel )
U6808B data
데이터시트 다운로드 :
[ U6808B.PDF ]
[ U6808B 다른 제조사 검색 ]
국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
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전력반도체 문의 : 010-3582-2743
