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MAX6852AEE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32
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.
Applications
Features
♦ High-Speed 26MHz SPI-/QSPI-/MICROWIRE™-
Compatible Serial Interface
♦ 2.7V to 3.6V Operation
♦ Controls Up to 96 5 x 7 Matrix Characters
♦ One Digit and Two Digits per Grid and Universal
Displays Supported
♦ 16-Step Digital Brightness Control
♦ Built-In ASCII 104-Character Font
♦ 24 User-Definable Characters
♦ Up to Four Annunciators per Grid with Automatic
Blinking Control
♦ Separate Cursor Control with Automatic Blinking
♦ Filament Drive Full-Bridge Waveform Synthesis
♦ Buzzer Tone Generator with Single-Ended or
Push-Pull Driver
♦ Up to Five General-Purpose Logic Outputs
♦ 9µA Low-Power Shutdown (Data Retained)
♦ 16-Pin QSOP Package
MAX6852
4-Wire Interfaced, 5
✕
7 Matrix Vacuum-
Fluorescent Display Controller
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-2537; Rev 1; 11/02
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
MAX6852AEE -40°C to +125°C 16 QSOP
Display Modules
Retail POS Displays
Weight and Tare
Displays
Bar Graph Displays
Industrial Controllers
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
MAX6852
VFCLK
VFDOUT
VFLOAD
VFBLANK
OSC2
DIN
SCLK
OSC1
CS
DOUT
SCLK
CS
MICROCONTROLLER
56pF
0.1µF
GND
CHIP-ON-GLASS VFD
VFD SUPPLY VOLTAGE
10kΩ
Typical Application Circuit
Pin Configuration and Functional Diagram appear at end of
data sheet.
MAX6852
4-Wire Interfaced, 5
✕
7 Matrix Vacuum-
Fluorescent Display Controller
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage (with respect to GND)
V+ .............................................................................-0.3V to +4V
DIN, SCLK,
CS ......................................................-0.3V to +5.5V
All Other Pins................................................-0.3V to (V+ + 0.3V)
Current
V+..................................................................................200mA
GND .............................................................................-200mA
PHASE1, PHASE2, PORT0, PORT1, PUMP................±150mA
VFCLK, VFDOUT, VFLOAD, VFBLANK ......................±150mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate at 8.34mW/°C above +70°C).....667mW
Operating Temperature Range (T
MIN
, T
MAX
)
MAX6852AEE................................................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
DC ELECTRICAL CHARACTERISTICS
(Typical operating circuit, V+ = 2.7V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Operating Supply Voltage V+ 2.7 3.6 V
T
A
= T
MIN
to
T
MAX
85
Shutdown Supply Current I
SHDN
Shutdown mode, all digital
inputs at V+ or GND
T
A
= +25°C
930
µA
T
A
= T
MIN
to
T
MAX
3.5
Operating Supply Current I+
OSC = 4MHz
VFLOAD, VFDOUT, VFCLK,
VFBLANK, loaded 100pF
T
A
= +25°C 0.71
3.0
mA
Master Clock Frequency (OSC
Internal Oscillator)
f
OSC
OSC1 fitted with C
OSC
= 56pF, OSC2 fitted
with R
OSC
= 10kΩ; see the Typical
Operating Circuit
4
MHz
Master Clock Frequency (OSC
External Oscillator)
OSC1 overdriven with external f
OSC
28
MHz
Dead-Clock Protection
Frequency
200
kHz
OSC High Time t
CH
50 ns
OSC Low Time t
CL
50 ns
Fast or Slow Segment Blink Duty
Cycle
(Note 2)
49.5 50.5
%
LOGIC INPUTS AND OUTPUTS
Input Leakage Current DIN,
SCLK, CS
I
IH
, I
IL
0.2 1 µA
Logic-High Input Voltage DIN,
SCLK, CS
V
IH
2.4 V
Logic-Low Input Voltage DIN,
SCLK, CS
V
IL
0.6 V
MAX6852
4-Wire Interfaced, 5
✕
7 Matrix Vacuum-
Fluorescent Display Controller
_______________________________________________________________________________________ 3
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Output Rise and Fall Time
PHASE1, PHASE2, PORT0,
PORT1, PUMP, VFLOAD,
VFDOUT, VFCLK, VFBLANK
t
RFT
C
LOAD
= 100pF 25 ns
Output High-Voltage
PHASE1, PHASE2, PORT0,
PORT1, PUMP, VFLOAD,
VFDOUT, VFCLK, VFBLANK
V
OH
I
SOURCE
= 10mA
V + - 0.6
V
Output Low-Voltage
PHASE1, PHASE2, PORT0,
PORT1, PUMP, VFLOAD,
VFDOUT, VFCLK, VFBLANK
V
OL
I
SINK
= 10mA
0.4V
V
Output Short-Circuit Source
Current PHASE1, PHASE2,
PORT0, PORT1, PUMP, VFLOAD,
VFDOUT, VFCLK, VFBLANK
I
OHSC
Output programmed high, output short
circuit to GND (Note 2)
62 125 mA
Output Short-Circuit Sink Current
PHASE1, PHASE2, PORT0,
PORT1, PUMP, VFLOAD,
VFDOUT, VFCLK, VFBLANK
I
OLSC
Output programmed low, output short
circuit to V+ (Note 2)
72 125 mA
4-WIRE SERIAL INTERFACE TIMING CHARACTERISTICS (Figure 6)
SCLK Clock Period t
CP
38.4
ns
SCLK Pulse Width High t
CH
19 ns
SCLK Pulse Width Low t
CL
19 ns
CS Fall to SCLK Rise Setup Time
t
CSS
9.5 ns
SCLK Rise to CS Rise Hold Time
t
CSH
5ns
DIN Setup Time t
DS
9.5 ns
DIN Hold Time t
DH
2ns
Minimum CS Pulse High t
CSW
19 ns
DOUT Cascade Setup Time
PORT0, PORT1
t
CSU
PORT0 and/or PORT1 enabled as DOUT 9.5 ns
VFD INTERFACE TIMING CHARACTERISTICS (Figure 9)
VFCLK Clock Period t
VCP
(Note 2) 250
1050
ns
VFCLK Pulse Width High t
VCH
(Note 2) 125 ns
VFCLK Pulse Width Low t
VCL
(Note 2) 125 ns
VFCLK Rise to VFD Load Rise
Hold Time
t
VCSH
(Note 2) 19 µs
VFDOUT Setup Time t
VDS
(Note 2) 50 ns
VFLOAD Pulse High t
VCSW
(Note 2) 245 ns
Note 1: All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2: Guaranteed by design.
DC ELECTRICAL CHARACTERISTICS (continued)
(Typical operating circuit, V+ = 2.7V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32

MAX6852AEE+T

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Buy MAX6852AEE+T
Manufacturer:
Maxim Integrated
Description:
IC VFD CTRLR MATRIX 16QSOP
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