A2550 查看數據表（PDF） - Allegro MicroSystems

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A2550

Relay Driver with 5 V Regulator for Automotive Applications

Allegro MicroSystems 

A2550

Relay Driver with 5 V Regulator

for Automotive Applications

Timing Diagram: Watchdog Monitoring

VREG5

WDI

CWD

CPOR

NPOR

tWD

tWDR

OUTx outputs enabled

1

2

internal Vref

~INx

3

4

1. Missing watchdog detected (WDI low).

2. NPOR pulses generated periodically.

3. NPOR inactive, but outputs not enabled until watchdog detected.

4. Missing watchdog detected (WDI low, steps 2 and 3 repeat).

Allegro MicroSystems, Inc.

9

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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