LM9831 datasheet(40/41 Pages) NSC

Part #	LM9831

Description	LM9831 42-Bit Color, 1200dpi USB Image Scanner

PDF	41 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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40 / 41 page

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+Vmotor

–

Reset

Phase A

Invert

Set-Dominant

S/R Flipflop

+Vmotor

Stepper

Phase A

Stepper

Phase A

Stepper

Phase B

Stepper

Phase B

DAC code for

phase A

SENSE1

SENSE2

HIGH CURRENT

GND SENSE

Ω

DAC A:

0.110V,

0.175V,

0.325V,

0.425V,

0.465V

Comparators need no hysteresis. SR flipflops are set periodi-

cally by pulse from PWM Generator. Flipflops can only be reset

after SR goes low when Reset (comparator output) is high

(VSENSE > VDAC).

Reset is level sensitive, not edge sensitive.

12MHz

÷1 to 256

÷64

PWM

Generator

0/64 to

63/64

high time

–

Reset

Set-Dominant

S/R Flipflop

DAC B:

0.110V,

0.175V,

0.325V,

0.425V,

0.465V

Set

DAC code for

phase B

Phase B

Invert

TriState Stepper

Motor Outputs

LM9831

Stepper Motor Current Controller Block Diagram

External Components

LM9831 Datasheet(PDF) 40 Page - National Semiconductor (TI)

LM9831 Datasheet(HTML) 40 Page - National Semiconductor (TI)

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