LM9833 datasheet(18/42 Pages) NSC

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Kickstart steps (fullstepping mode)

nnnMotor gets maximum current for first n (0-7) full steps

Hold Current Timeout

n nnnn

Full step time units (1-31) (do not set to 0)

Stepper Motor PWM Frequency

n nnnnnnn

=CRYSTAL OUT/(256*n) (0 < n < 256)

=CRYSTAL OUT/(256*256) (n = 0)

Stepper Motor PWM Set Duty Cycle

nnnnnn= minimum of n/64 (default = 0)

PAPER SENSE SETTINGS

PAPER SENSE 1: Polarity

0 A low input on PAPER SENSE 1 is True

1 A high input on PAPER SENSE 1 is True

PAPER SENSE 1: Level/Edge sensitive

Level sensitive: PAPER SENSE 1 State bit (in Status

True.

Edge sensitive: PAPER SENSE 1 State bit (in Status

True since the last time the Status Register was read.

PAPER SENSE 1: Stop Scan, High Speed

Forward, and High Speed Reverse

Use this input for the home sensor in flatbed

scanners.

Transitions on PAPER SENSE 1 will not clear the

command register.

A False-to-True transition on PAPER SENSE 1 will

clear the Command Register and stop the scan.

PAPER SENSE 2: Polarity

A low input on PAPER SENSE 2 is True

A high input on PAPER SENSE 2 is True

PAPER SENSE 2: Level/Edge sensitive

Level sensitive: PAPER SENSE 2 State bit (in Status

True.

Edge sensitive: PAPER SENSE 2 State bit (in Status

True since the last time the Status Register was read.

PAPER SENSE 2: Stop Scan and High

Speed Forward

The scan will automatically stop after scanning for the

number of fullsteps specified in the Step Counter

(registers 4C and 4D). (The fullsteps moved during

the “FastFeed At Start of scan period are not

counted.) If the value in the Step Counter is 0, the

scan can only be stopped by writing a 0 to register 07.

A False-to-True transition on PAPER SENSE 2 will

stop a scan or a High Speed Forward command after

the number of fullsteps specified in the Step Counter

(registers 4C and 4D). It will not stop a High Speed

Reverse, and therefore should not be used as a home

position sensor input.

Address

Function

Value

LM9833 Datasheet(PDF) 18 Page - National Semiconductor (TI)

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