Rainbow-electronics MAX6931 User Manual download pdf

General Description

The MAX6921/MAX6931 are 20-output, 76V, vacuum-

fluorescent display (VFD) tube drivers that interface a

multiplexed VFD tube to a VFD controller, such as the

MAX6850–MAX6853, or to a microcontroller. The

MAX6921/MAX6931 are also ideal for driving static VFD

tubes or telecom relays.

Data is input using an industry standard 4-wire serial

interface (CLOCK, DATA, LOAD, BLANK), compatibile

with either Maxim’s or industry-standard VFD driver and

controller.

For easy display control, the active-high BLANK input

forces all driver outputs low, turning the display off, and

automatically puts the MAX6921/MAX6931 into shut-

down mode. Display intensity may also be controlled by

directly pulse-width modulating the BLANK input.

The MAX6921 has a serial interface data output, DOUT,

allowing any number of devices to be cascaded on the

same serial interface.

The MAX6931 has a negative supply voltage input, V

allowing the drivers’ output swing to be made bipolar to

simplify filament biasing in many applications.

The MAX6921 is available in 28-pin TSSOP, SO, and

PLCC packages. The MAX6931 is available in a 28-pin

TSSOP package.

Maxim also offers 12-output VFD drivers (MAX6920) and

32-output VFD drivers (MAX6922/MAX6932).

Applications

White Goods Industrial Weighing

Gaming Machines Security

Automotive Telecom

Avionics VFD Modules

Instrumentation Industrial Control

Features

♦ 5MHz Industry-Standard 4-Wire Serial Interface

♦ 3V to 5.5V Logic Supply Range

♦ 8V to 76V Grid/Anode Supply Range

♦ -11V to 0V Filament Bias Supply (MAX6931 Only)

♦ Push-Pull CMOS High-Voltage Outputs

♦ Outputs can Source 40mA, Sink 4mA

Continuously

♦ Outputs can Source 75mA Repetitive Pulses

♦ Outputs can be Paralleled for Higher Current Drive

♦ Any Output can be Used as a Grid or an Anode

Driver

♦ Blank Input Simplifies PWM Intensity Control

♦ Small 28-Pin TSSOP Package

♦ -40°C to +125°C Temperature Range

MAX6921/MAX6931

20-Output, 76V, Serial-Interfaced

VFD Tube Drivers

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3020; Rev 0; 10/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE PIN-PACKAGE

MAX6921AUI -40°C to +125°C 28 TSSOP

MAX6921AWI -40°C to +125°C 28 Wide SO

MAX6921AQI -40°C to +125°C 28 PLCC

MAX6931AUI -40°C to +125°C 28 TSSOP

MAX6931

DIN

CLK

LOAD

BLANK

VFDOUT

VFCLK

VFLOAD

VFBLANK

VFD TUBE

921

GND

-7V

µC

100nF

+5V

100nF

+60V

OUT0–OUT19

Typical Operating Circuit

Pin Configurations appear at end of data sheet.

1 2 3 4 5 6 ... 13 14

MAX6921/MAX6931 1
VFD Tube Drivers 1

Summary of Contents

Page 1 - VFD Tube Drivers

General DescriptionThe MAX6921/MAX6931 are 20-output, 76V, vacuum-fluorescent display (VFD) tube drivers that interface amultiplexed VFD tube to a VFD

Page 2

MAX6921/MAX6931A multiplexed tube dissipation example follows:VCC= 5V ±5%, VBB= 36V to 42V, A = 12, G = 8, IANODE= 0.4mA, IGRID= 24mAPD= (5.25V x 1mA)

Page 3

MAX6921/MAX693120-Output, 76V, Serial-Interfaced VFD Tube Drivers_____________________________________________________________________________________

Page 4

MAX6921/MAX693120-Output, 76V, Serial-Interfaced VFD Tube Drivers12 __________________________________________________________________________________

Page 5

MAX6921/MAX693120-Output, 76V, Serial-Interfaced VFD Tube Drivers_____________________________________________________________________________________

Page 6

MAX6921/MAX693120-Output, 76V, Serial-Interfaced VFD Tube DriversMaxim cannot assume responsibility for use of any circuitry other than circuitry enti

Page 7

MAX6921/MAX693120-Output, 76V, Serial-Interfaced VFD Tube Drivers2 ___________________________________________________________________________________

Page 8

MAX6921/MAX693120-Output, 76V, Serial-Interfaced VFD Tube Drivers_____________________________________________________________________________________

Page 9

Typical Operating Characteristics(VCC= 5.0V, VBB= 76V, and TA= +25°C, unless otherwise noted.)MAX6921/MAX693120-Output, 76V, Serial-Interfaced VFD Tub

Page 10

MAX6921/MAX693120-Output, 76V, Serial-Interfaced VFD Tube Drivers_____________________________________________________________________________________

Page 11

MAX6921/MAX693120-Output, 76V, Serial-Interfaced VFD Tube Drivers6 ___________________________________________________________________________________

Page 12

Detailed DescriptionThe MAX6921/MAX6931 are VFD tube drivers compris-ing a 4-wire serial interface driving 20 high-voltage Rail-to-Railoutput ports.

Page 13

MAX6921/MAX6931Writing Device Registers Using the4-Wire Serial InterfaceThe MAX6921/MAX6931 are normally written using thefollowing sequence:1) Take C

Page 14

Output Current RatingsThe continuous current-source capability is 40mA peroutput. Outputs may drive up to 75mA as a repetitivepeak current, subject to

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Rainbow-electronics MAX6931 User Manual

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Summary of Contents

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