LM9830 datasheet(20/45 Pages) NSC

20 / 45 page

http://www.national.com

STEPPER MOTOR CONTROL SETTINGS 1

n (Line Skipping)

Part of the “n out of m” function, consisting of

registers 0B (bits 4-7) 44, 45 (bit 5), and 5A.

ttttttt

n lines saved in SRAM for every m lines (register 5A)

scanned, function bypassed if register value = 0.

n (lines saved per m lines scanned) = 256 - t

t = 256 - n

If t = 0 then function is bypassed

Full/Microstepping

0 Full Step Mode

1 MicroStepping Mode

Current Sensing Phases

= 0 for fullstepping

= 1 for microstepping

1 Phase - No microstepping, just kickstart/stop

functions

2 Phases - necessary for microstepping

Stepper Motor Phase A Polarity

Positive (A/B/A/B Output high = winding energized)

Negative (A/B/A/B output low = winding energized)

Stepper Motor Phase B Polarity

Positive (A/B/A/B Output high = winding energized)

Negative (A/B/A/B output low = winding energized)

A, B, A, and B stepper motor status

A, B, A, and B output pins in Tri-State

A, B, A, and B output pins active

Line Skipping Phase

Part of the “n out of m” function, consisting of

registers 0B (bits 4-7) 44, 45 (bit 5), and 5A.

Red sensor data arrives before Green sensor

Blue sensor data arrives before Green sensor

Scanning Step Size - MSB

nnnnnnThe step size of one microstep while scanning, in

units of pixel periods (minimum 2).

Scanning Step Size - LSB

n nnnnnnn

Fast Feed Step Size - MSB

nnnnnnThe step size of one microstep while fast feeding, in

units of pixel periods (minimum 2).

Fast Feed Step Size - LSB

n nnnnnnn

Fullsteps to Skip at Start of Scan - MSB

nnnnnnWhen scan starts, paper is fed forward n full steps (0 -

16383) at highest speed. For “zooming” in flatbeds

Fullsteps to Skip at Start of Scan - LSB

n nnnnnnn

Fullsteps to Scan after Paper Sensor #2

trips -MSB

nnnnnnAdds a delay of n (0-16383) full steps between when

Paper Sensor #2 trips and when the scanning bit is

reset, terminating the scan/motor movement.

Fullsteps to Scan after Paper Sensor #2

trips -LSB

n nnnnnnn

Pause scanning, stop/reverse motor

n nnnnnnnPause scan when buffer is n kbytes full

Resume scanning, start motor

n nnnnnnnResume scan when buffer is n kbytes full

Full steps to reverse when buffer is full

nnnnnnn (0-63) full steps (0 = do not reverse)

Acceleration Profile (stopped)

n n n (0-3) full step time units pause while stopped

Acceleration Profile (25%)

n n

n (0-3) full steps at 25% speed

Acceleration Profile (50%)

n n

n (0-3) full steps at 50% speed

Default Phase Difference - MSB

n nnnnnnnUsed to calculate when motor resumes after reversing

and stopping. 1 < n < 65535

Default Phase Difference - LSB

n nnnnnnn

Lines to Process After Pause Scan Signal

nnn

n (0-7) lines. This only applies if the motor doesn’t

reverse (reverse steps = 0).

Lines to Discard after Resume Scan

Signal

nnn

n (0-7) lines. This only applies if the motor doesn’t

reverse (reverse steps = 0).

Should be set to same value as bits 0-2.

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), 0 = no hold current

Stepper Motor PWM Frequency

n nnnnnnn

=CRYSTAL IN/(4*n) (0 < n < 256)

=CRYSTAL IN/(4*256) (n = 0)

Stepper Motor PWM Set Duty Cycle

nnnnnn= n/64 (default = 0)

Address

Function

Value

LM9830 Datasheet(PDF) 20 Page - National Semiconductor (TI)

LM9830 Datasheet(HTML) 20 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

Datasheet Download

Link URL