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Autonom robotväckarklocka med trådlös basstation - KTH

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2<br />

3953<br />

FULL-BRIDGE<br />

PWM MOTOR DRIVER<br />

X = Irrelevant<br />

LOGIC<br />

SUPPLY<br />

MODE<br />

PHASE<br />

ENABLE<br />

BRAKE<br />

GROUND<br />

6<br />

14<br />

7<br />

8<br />

1<br />

VCC<br />

FUNCTIONAL BLOCK DIAGRAM<br />

SLEEP &<br />

STANDBY MODES<br />

INPUT LOGIC<br />

UVLO<br />

& TSD<br />

BLANKING<br />

PWM LATCH<br />

Q<br />

4<br />

VCC<br />

RC + –<br />

12<br />

5 3<br />

2<br />

13<br />

R T<br />

TRUTH TABLE<br />

BRAKE ENABLE PHASE MODE OUT A OUT B DESCRIPTION<br />

H H X H Off Off Sleep Mode<br />

H H X L Off Off Standby<br />

H L H H H L Forward, Fast Current-Decay Mode<br />

H L H L H L Forward, Slow Current-Decay Mode<br />

H L L H L H Reverse, Fast Current-Decay Mode<br />

H L L L L H Reverse, Slow Current-Decay Mode<br />

L X X H L L Brake, Fast Current-Decay Mode<br />

L X X L L L Brake, No Current Control<br />

R<br />

S<br />

LOAD<br />

SUPPLY<br />

VBB<br />

115 Northeast Cutoff, Box 15036<br />

Worcester, Massachusetts 01615-0036 (508) 853-5000<br />

Copyright © 1995, 2000, 2005 Allegro MicroSystems, Inc.<br />

C T<br />

9<br />

V TH<br />

OUT A<br />

+<br />

–<br />

10<br />

15<br />

REF<br />

OUT B<br />

LOAD<br />

SUPPLY<br />

16<br />

11<br />

SENSE<br />

R S<br />

GROUND<br />

Dwg. FP-036-2A

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