LM9830 datasheet(43/45 Pages) NSC

Part #	LM9830

Description	LM9830 36-Bit Color Document Scanner

PDF	45 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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43 / 45 page

+24V

–

Reset

Phase A

Invert

Set-Dominant

S/R Flipflop

+24V

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:

0.125V,

0.191V,

0.353V,

0.462V,

0.500V

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.

÷4

÷1 to 256

÷64

PWM

Generator

0/64 to

63/64

high time

–

Reset

Set-Dominant

S/R Flipflop

DAC A:

0.125V,

0.191V,

0.353V,

0.462V,

0.500V

Set

CRYSTAL IN

(50MHz)

Optional zener speeds

up motor current

decay when transistor

is off. VZ ~ 24V

DAC code for

phase B

Phase B

Invert

TriState Stepper

Motor Outputs

LM9830

Stepper Motor Current Controller Block Diagram

LM9830 Datasheet(PDF) 43 Page - National Semiconductor (TI)

LM9830 Datasheet(HTML) 43 Page - National Semiconductor (TI)

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