LM9830 datasheet(11/45 Pages) NSC

11 / 45 page

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Pin Descriptions

CCD Driver Signals

ø1

Digital Output. CCD/CIS clock signal, phase

ø2

Digital Output. CCD clock signal, phase 2.

Digital Output. Reset pulse for the CCD.

CP1

Digital Output. Clamp pulse for the CCD.

CP2

Digital Output. Clamp pulse for the CCD.

TR1, TR2

Digital

Outputs.

Transfer

pulses

for

the

CCD(CIS).

Analog I/O

OSR, OSG,

OSB

Analog Inputs. These inputs (for Red, Green,

and Blue) should be tied to the sensor’s out-

put signal through DC blocking capacitors.

VREF LO FORCE,

VREF LO SENSE

Analog Output/Input. Connect VREF LO OUT to

VREF LO IN and bypass to AGND with a 0.05µF

monolithic capacitor.

VREF MID FORCE,

VREF MID SENSE

Analog Output/Input. Connect VREF MID OUT

to VREF MID IN and bypass to AGND with a

0.05µF monolithic capacitor.

VREF HI FORCE,

VREF HI SENSE

Analog Output/Input. Connect VREF HI OUT to

VREF HI IN and bypass to AGND with a 0.05µF

monolithic capacitor.

VBANDGAP

Analog Output. Bypass to AGND with a

0.05µF monolithic capacitor.

General Digital I/O

CRYSTAL IN

Digital Input. This is the 50MHz (typical) mas-

ter system clock.

CRYSTAL OUT Digital Output. Used with CRYSTAL IN and an

external crystal to form a crystal oscillator.

CLK_SEL

Digital Input. Should be tied to DGND for

operation with an external crystal. To use an

external TTL or CMOS clock source, tie

CLK_SEL to VD I/O and drive the clock into the

CRYSTAL OUT pin.

PC I/O

D0 (LSB) -D7

(MSB)

Digital Inputs/Outputs. This is the 8 bit data

path between the LM9830 and the host com-

puter.

STROBE

Digital Input. WR signal in µP Mode.

AUTOFEED

Digital Input. RD signal in µP Mode.

SELECTIN

Digital Input. ALE signal in µP Mode.

INIT

Digital Input. CS signal in µP Mode.

ACK

Digital Output.

BUSY

Digital Output.

SELECT

Digital Output.

ERROR

Digital Output.

Printer Passthrough

TRISTATE

Digital

Output.

Low

when

printer

passthrough mode, high when the LM9830 is

active. Low when no power is applied to the

LM9830.

LATCH

Digital

Output.

High

when

printer

passthrough mode, low when the LM9830 is

active. Tri-state when no power is applied to

the LM9830.

Stepper Motor I/O

A, B, A, B

Digital Outputs. Pulses to stepper motor.

SENSEA,

SENSEB

Analog Inputs. Current sensing for PWM

winding current control.

SENSEGND

Analog Input. Ground sense input for PWM

winding current control.

Scanner Support I/O

PSense #1,

PSense #2

Digital Inputs. Programmable, used for sens-

ing paper, front panel switches, etc.

Misc I/O #1,

Misc I/O #2

Digital Inputs/Outputs. Programmable, used

for front panel switches, status LEDs, etc.

LAMPR,

LAMPG, LAMPB

Digital Outputs. Used to control R, G, and B

LEDs of single output CIS, as well as bright-

ness of CCFL.

External RAM I/O

DB0 (LSB) -

DB7 (MSB)

Digital Inputs/Outputs. This is the 8 bit data

path between the external RAM and the

LM9830.

A0-A17

Digital Outputs. Address pins for up to 256k

bytes external RAM.

Digital Output. Read signal to external RAM.

Digital Output. Write signal to external RAM.

Communication Mode

CMODE

Digital Input. Tie to DGND to operate in paral-

lel port mode, or to VD I/O to operate in micro-

processor compatible mode.

Test

TEST

Analog Output. This pin can be used to view

the Sample Signal, Sample Reference, and

Clamp Signals.

Analog Power Supplies

This is the positive supply pin for the analog

supply. It should be connected to a voltage

source of +5V and bypassed to AGND with a

0.1µF monolithic capacitor in parallel with a

10µF tantalum capacitor.

AGND

This is the ground return for the analog sup-

ply.

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