MAX6852 Datasheet, PDF (1/32 Pages) Maxim Integrated Products – 4-Wire Interfaced, 5 x 7 Matrix Vacuum- Fluorescent Display Controller

19-2537; Rev 1; 11/02
4-Wire Interfaced, 5 ✕ 7 Matrix Vacuum-
Fluorescent Display Controller
General Description
The MAX6852 compact vacuum-fluorescent display
(VFD) controller provides microprocessors with the mul-
tiplex timing for 5 x 7 matrix VFD displays up to 96
characters and controls industry-standard, shift-regis-
ter, high-voltage grid/anode VFD tube drivers. The
device supports display tubes using either one or two
digits per grid, as well as universal displays. The
MAX6852 provides an internal crosspoint switch to
match any tube-driver shift-register grid/anode order,
and is compatible with both chip-in-glass and external
tube drivers. Hardware is included to simplify the gener-
ation of cathode bias and filament supplies and to pro-
vide up to five logic outputs, including a buzzer driver.
The MAX6852 includes an ASCII 104-character font,
multiplex scan circuitry, and static RAM that stores
digit, cursor, and annunciator data, as well as font data
for 24 user-definable characters. The display intensity
can be adjusted by an internal 16-step digital bright-
ness control. The device also includes separate annun-
ciator and cursor control with automatic blinking, as
well as a low-power shutdown mode.
The MAX6852 provides timing to generate the PWM
waveforms to drive the tube filament from a DC supply.
The filament drive is synchronized to the display multi-
plexing to eliminate beat artifacts. The MAX6852 is
compatible with SPI™ and QSPI™.
For a 2-wire interfaced version, refer to the MAX6853
data sheet.
Features
o High-Speed 26MHz SPI-/QSPI-/MICROWIRE™-
Compatible Serial Interface
o 2.7V to 3.6V Operation
o Controls Up to 96 5 x 7 Matrix Characters
o One Digit and Two Digits per Grid and Universal
Displays Supported
o 16-Step Digital Brightness Control
o Built-In ASCII 104-Character Font
o 24 User-Definable Characters
o Up to Four Annunciators per Grid with Automatic
Blinking Control
o Separate Cursor Control with Automatic Blinking
o Filament Drive Full-Bridge Waveform Synthesis
o Buzzer Tone Generator with Single-Ended or
Push-Pull Driver
o Up to Five General-Purpose Logic Outputs
o 9µA Low-Power Shutdown (Data Retained)
o 16-Pin QSOP Package
PART
MAX6852AEE
Ordering Information
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
16 QSOP
Display Modules
Retail POS Displays
Weight and Tare
Displays
Applications
Bar Graph Displays
Industrial Controllers
Pin Configuration and Functional Diagram appear at end of
data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
Typical Application Circuit
CHIP-ON-GLASS VFD
VFD SUPPLY VOLTAGE
0.1µF
MICROCONTROLLER
DOUT
SCLK
CS
VFCLK
MAX6852
VFDOUT
DIN
VFLOAD
SCLK
VFBLANK
CS
OSC2
OSC1
GND
56pF
10kΩ
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