U6813B-MFPG3 데이터 시트보기 (PDF) - Atmel Corporation

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U6813B-MFPG3

Fail-safe IC with High-side and Relay Driver

Atmel Corporation 

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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