Rainbow-electronics MAX1621 Manual de usuario descargar pdf

General Description

The MAX1620/MAX1621 convert a 1.8V to 20V battery

voltage to a positive or negative LCD backplane bias

voltage. Backplane bias voltage can be automatically

disabled when the display logic voltage is removed,

protecting the display. These devices use very little PC

board area, come in ultra-small QSOP packages, and

require only small, low-profile external components.

Output voltage can be set to a desired positive or nega-

tive voltage range with external resistors, and adjusted

over that range with the on-board digital-to-analog con-

verter (DAC) or with a potentiometer. The MAX1620/

MAX1621 include a 5-bit DAC, allowing digital software

control of the bias voltage. The MAX1620 uses up/down

digital signaling to adjust the DAC, and the MAX1621

uses the System Management Bus (SMBus™) 2-wire

serial interface.

These devices use a low-cost, external, N-channel MOSFET

power switch or NPN transistor, and can be configured

for positive or negative output voltages. Operating cur-

rent is a low 150µA, typically provided from a display’s

logic supply of 3.0V to 5.5V. The MAX1620/MAX1621 are

available in a 16-pin QSOP package.

Applications

Notebook Computers

Palmtop Computers

Personal Digital Assistants

Portable Data-Collection Terminals

Features

♦ 1.8V to 20V Battery Input Voltage

♦ Automatic Disable when Display Logic

is Shut Down

♦ Extremely Small QSOP Package

♦ 32-Level Internal DAC

♦ SMBus Serial Interface (MAX1621)

♦ Positive or Negative Output Voltage

MAX1620/MAX1621

Digitally Adjustable LCD Bias Supplies

________________________________________________________________

Maxim Integrated Products

PART

MAX1620EEE

MAX1621EEE

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

16 QSOP

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Ordering Information

19-1214; Rev 1; 1/98

DHI

DLO

PGND

DOUT

POL

SHDN

REF

AGND

MAX1620

12.5V

23.5V OUT

2V TO

12V

3V TO

5.5V

OFF

DOWN

LCDONPOK

BATT

Typical Operating Circuit

SMBus is a trademark of Intel Corp.

Pin Configuration

DHI

DLO

PGND

AGND

DOUT

DN (SDA)

UP (SCL)

BATT

SHDN (SUS)

POK

REF

POL

LCDON

TOP VIEW

MAX1620

MAX1621

QSOP

( ) ARE FOR MAX1621 ONLY.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

1 2 3 4 5 6 ... 19 20

MAX1620/MAX1621 1

Indice de contenidos

Pagina 1 - MAX1620/MAX1621

General DescriptionThe MAX1620/MAX1621 convert a 1.8V to 20V batteryvoltage to a positive or negative LCD backplane biasvoltage. Backplane bias voltag

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MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies10 ______________________________________________________________________________________R1360k2V

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MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies______________________________________________________________________________________ 11maximum

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MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies12 ______________________________________________________________________________________The MAX1

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MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies______________________________________________________________________________________ 13Reserved

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STARTCONDITIONMOSTSIGNIFICANTADDRESS BITLEASTSIGNIFICANTADDRESS BITSLAVEPULLSSDA LOWSLAVEPULLSSDA LOWREGSELD4OPR-LCDONOPR-SHDND3 D2 D1 D0SLAVEACKNOWLE

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MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies______________________________________________________________________________________ 15STARTCON

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MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies16 ______________________________________________________________________________________Setting

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MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies______________________________________________________________________________________ 17COMPANY

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MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies18 ______________________________________________________________________________________Diode Se

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MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies______________________________________________________________________________________ 19________

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MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies2 _______________________________________________________________________________________ABSOLUTE

Pagina 13

MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies20 ______________________________________________________________________________________________

Pagina 14

MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies_______________________________________________________________________________________3ELECTRICA

Pagina 15

MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies4 _______________________________________________________________________________________Operatin

Pagina 16

MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies_______________________________________________________________________________________ 5TIMING C

Pagina 17

MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies6 _______________________________________________________________________________________________

Pagina 18

MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies_______________________________________________________________________________________ 715161718

Pagina 19

MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies8 _______________________________________________________________________________________External

Pagina 20

MAX1620/MAX1621Digitally Adjustable LCD Bias Supplies_______________________________________________________________________________________ 9t3t1UPDN

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Rainbow-electronics MAX1621 Manual de usuario

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