LM9833 datasheet(3/42 Pages) NSC

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Pin Descriptions

USB Interface

D+, D-

Digital I/O. USB Interface signals

BUS POWER

Digital Input. Tie low for bus powered sys-

tems, tie high for external power.

ACTIVE/

SUSPENDED

Digital Output. Low in Suspend mode. High in

operational mode. Used to control external

regulators, other components.

SDA

Digital I/O. Serial Data to/from external

EEPROM.

SCL

Digital Output. Serial Clock Output to external

EEPROM.

Analog

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. If

unused, tie to ground through DC blocking

capacitors.

VREF LO

Analog Output/Input. Bypass to AGND with a

0.047µF monolithic capacitor. Do not put a

DC load on this pin.

VREF MID

Analog Output/Input. Bypass to AGND with a

0.047µF monolithic capacitor. Do not put a

DC load on this pin.

VREF HI

Analog Output/Input. Bypass to AGND with a

0.047µF monolithic capacitor. Do not put a

DC load on this pin.

VBANDGAP

Analog Output. Bypass to AGND with a

0.047µF monolithic capacitor. Do not put a

DC load on this pin.

DRAM

D0 (LSB) -D15

(MSB)

Digital Inputs/Outputs. This is the 16 bit data

path between the external DRAM and the

LM9833.

Digital Output. Read signal to external DRAM.

Digital Output. Write signal to external DRAM.

A0-A9

Digital Outputs. Address pins for up to 1M x

16 external DRAM.

RAS

Digital Output. Row Address Strobe signal.

CAS

Digital Output. Column Address Strobe sig-

nal.

Scanner Support I/O

PAPER

SENSE 1-2

Digital Inputs. Programmable, used for sens-

ing

home

position,

paper,

front

panel

switches, etc.

MISC I/O 1-6

Digital Inputs/Outputs. Programmable, used

for front panel switches, status LEDs, etc. At

power-on and in Suspend Mode, MISC I/Os

1-3 are inputs and MISC I/Os 4-6 are outputs.

Stepper Motor

A, B, A, B

Digital Outputs. Pulses to stepper motor drive

circuitry.

SENSEA,

SENSEB

Analog Inputs. Current sensing for stepper

motor’s PWM current control.

SENSEGND

Analog Input. Ground sense input for stepper

motor’s PWM current control.

Sensor Control

ø1

Digital Output. CCD/CIS clock signal phase 1.

ø2

Digital Output. CCD/CIS clock signal phase 2.

Digital Output. Reset pulse for the CCD/CIS.

CP1

Digital Output. Clamp pulse for the CCD/CIS.

CP2

Digital Output. Clamp pulse for the CCD/CIS.

TR1, TR2

Digital Outputs. Transfer pulses for

the

CCD/CIS.

LAMPR,

LAMPG,

LAMPB

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

LEDs of single output CIS, as well as bright-

ness of CCFL. The CDS signal can be seen

on LAMPB in a test mode (see register 5E, bit

7).

Master Clock Generation

CRYSTAL IN

Digital Input. Used with CRYSTAL OUT and

an external 48MHz crystal to form a crystal

oscillator.

CRYSTAL

OUT

Digital Output. Used with CRYSTAL IN and an

external 48MHz crystal to form a crystal oscil-

lator.

CRYSTAL/

EXT CLOCK

Digital Input. Tie to DGND for operation with

an external crystal. Pull up to VD to drive

CRYSTAL OUT with an external TTL or

CMOS clock source.

24/48

Digital Input. Tie to DGND for operation with a

48MHz crystal or external clock. Pull up to VD

for operation with a 24MHz crystal or external

clock. NOTE: Operation at 24MHz is not guar-

anteed - always use a 48MHz crystal.

Miscellaneous

VREGULATOR

Digital Output. This is the regulated 3.3V sup-

ply (generated from VD) that powers the USB

transceiver. It should be used as the terminal

voltage for the 1.5k D+ pullup resistor, and

bypassed to DGND with a 0.047µF monolithic

capacitor.

RESET

Digital input. Take high to force device into

Power On Reset state, low to exit reset state.

TEST

Analog Output.

CMODE

Digital Input. Test mode, always tie high.

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