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U6813B PDF Data sheet ( 特性 )

部品番号 U6813B
部品説明 Fail-safe IC with High-side and Relay Driver
メーカ ATMEL Corporation
ロゴ ATMEL Corporation ロゴ 



Total 15 pages
		

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U6813B Datasheet, U6813B PDF,ピン配置, 機能
Features
Digital Self-supervising Watchdog with Hysteresis
One 150-mA Output Driver for Relay
One High-side Driver for N-channel Power FET
Positive and Negative Enable Output
Positive and Negative Reset Output
Over/Under-voltage Detection
Relay and Power FET Outputs Protected Against Standard Transients and 55-V Load
Dump
Description
The function of microcontrollers in safety-critical applications (e.g., anti-lock systems)
needs to be monitored permanently. Usually, this task is accomplished by an indepen-
dent watchdog timer. The monolithic IC U6813B, designed in bipolar technology and
qualified according to the needs of the automotive industry, includes such a watchdog
timer and provides additional features for added value. With the help of integrated
driver stages, it is easy to control safety-related functions of a relay and of an N-chan-
nel power MOSFET in high-side applications. In case of a microcontroller malfunction
or supply-voltage anomalies, the U6813B provides positive and negative reset and
enable output signals. This flexibility guarantees a broad range of applications. The
U6813B is based on of Atmel’s fail-safe ICs U6808B and U6809B.
Figure 1. Block Diagram
Fail-safe IC with
High-side and
Relay Driver
U6813B
3.3 V 16
VCC 14
3.3-V under- and
overvoltage detect.
Bandgap
reference
2.44 V
Reset
debounce
fosc
Power-on
reset
Reset
delay
fosc
RELI 13
FETI 12
WDI 11
5-V under- and
overvoltage detect.
19k
19k
Watchdog
19k
15
SGND
2
GND
Internal
oscillator
fosc
RC-
oscillator
supervisor
RC
oscillator
10
WDC
VCC
3 P-RES
4 N-RES
Current
limitation
VCC
VCC
FET
output
8 CAPI
1 RELO
6 N-EN
5 P-EN
9 FETO
7 VS
Rev. 4543A–AUTO–05/02
1

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U6813B

Fail-safe IC with High-side and Relay Driver

ATMEL Corporation
ATMEL Corporation

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