Rainbow Electronics MAX6934 - Manual

MAX6922/MAX6932/MAX6933/MAX6934
27-, 28-, and 32-Output, 76V,
Serial-Interfaced VFD Tube Drivers
________________________________________________________________ Maxim Integrated Products 1
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General Description
The MAX6922/MAX6932/MAX6933/MAX6934 multi-out-
put, 76V, vacuum-fluorescent display (VFD) tube drivers
that interface a VFD tube to a microcontroller or a VFD
controller, such as the MAX6850–MAX6853. The
MAX6922/MAX6934 have 32 outputs, while the MAX6932
has 27 outputs, and the MAX6933 has 28 outputs. All
devices are also suitable for driving telecom relays.
Data is input using standard 4-wire serial interface
(CLOCK, DATA, LOAD, BLANK) compatible with other
VFD drivers and controllers.
For easy display control, the active-high BLANK input
forces all driver outputs low, turning the display off, and
automatically puts the IC into shutdown mode. Display
intensity may also be controlled by directly pulse-width
modulating the BLANK input.
The MAX6922/MAX6932/MAX6934 have a serial inter-
face data output, DOUT, allowing any number of
devices to be cascaded on the same serial interface.
The MAX6932/MAX6933/MAX6934 have a negative
supply voltage input, V
SS , allowing the drivers’ output
swing to be made bipolar to simplify filament biasing in
many applications.
The MAX6922 is available in a 44-pin PLCC package,
the MAX6932 and MAX6933 are available in 36-pin
SSOP packages, and the MAX6934 is available in 44-
pin PLCC and thin QFN packages.
Maxim also offers a 12-output VFD driver (MAX6920)
and 20-output VFD drivers (MAX6921/MAX6931).
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
(MAX6932/MAX6933/MAX6934 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
♦ -40°C to +125°C Temperature Range as Standard
Ordering Information
19-3224; Rev 0; 1/04
PART TEMP RANGE PIN-PACKAGE
MAX6922 AQH -40°C to +125°C 44 PLCC
MAX6932 AAX -40°C to +125°C 36 SSOP
MAX6933 AAX -40°C to +125°C 36 SSOP
MAX6934 AQH -40°C to +125°C 44 PLCC
MAX6934ATH -40°C to +125°C 44 Thin QFN
MAX6934
DIN
CLK
LOAD
BLANK
VFDOUT
VFCLK
VFLOAD
VFBLANK
VFD TUBE
12 16
THIN QFN
GND
-7V
37
17
µC
18
15
C1
100nF
C3
100nF
+5V
38
V
CC
V
SS
C2
100nF
+60V
39
V
BB
OUT0–OUT31
32
Typical Operating Circuit
Pin Configurations appear at end of data sheet.
Selector Guide
PART
NO. OF
OUTPUTS
BIPOLAR
OUTPUT
SWING
DOUT FOR
CASCADING
MAX6922 32 No Yes
MAX6932 27 Yes Yes
MAX6933 28 Yes No
MAX6934 32 Yes Yes