W66880CF
VFD CONTROLLER/DRIVER
GENERAL DESCRIPTION
The W66880CF is a VFD (Vacuum Fluorescent Display)
controller/ driver. It can be programmed to drive a VFD
with 4 grids by 16 segments to 8 grids by 14 segments.
The W66880CF also includes a 24-key key scan circuit
and four LED ports and four general purpose input ports.
Data communication with the W66880CF is via a serial
interface.
•
•
•
•
•
High voltage output (V
DD
- V
EE
= 30V max)
Four 15 mA LED ports
Four general-purpose input port
Internal driver output pull-down resisters
Only one external resister is needed for the on chip
oscillator
•
Simple serial interface
•
44-pin plastic QFP package
FEATURES
•
Flexible display modes (4 to 8 grids)
−
4 grids
×
16 segments to 8 grids
×
14 segments
•
6
×
4 matrix key scanning
•
8 steps dimming circuit
APPLICATIONS
VFD display driving and panel function control
Functional Block
Pin Configuration
LED1
LED2
LED3
LED4
OSC
V
DD
V
SS
G2
G1
G3
35
44
43
42
41
40
39
38
37
36
Din
Dout
CLK
STB
2
34
G4
SW1
SW2
1
2
3
4
5
6
7
8
9
33
32
31
30
G5
G6
Sg16/G7
Sg15/G8
Sg14
Sg13
V
EE
Sg12
Sg11
Sg10
Sg9
Serial
interface
Display memory
16 bits x 8 words
SW3
16
14
Segment
Driver
SW4
Sg[1:14]
Dout
Din
V
SS
W66880
29
28
27
26
25
24
23
V
DD
R
Data
switch
OSC
Scan Timing
Generator
8
6
2
2
CLK
STB
Key1
10
Key2
11
12
13
14
15
16
17
18
19
20
21
22
OSC
Sg2/KS2
Sg3/KS3
Sg4/KS4
Sg5/KS5
Sg6/KS6
Multi-
plexed
driver
Sg1/KS1
Sg[15:16]
/G[8:7]
Key3
Key4
DD
Sg7
Key[1:4]
4
key data memory
Grid
driver
4-bit input latch
4-bit output latch
G[1:6]
4
4
SW[1:4]
LED[1:4]
V
DD
V
SS
V
EE
Winbond Corporate Headquarters
Tel : 886-3-5790666
Fax : 886-3-5796139
Details are subject to change without notice.
Apr. 1999
Taipei Sales Office
Tel : 886-2-7190505
Fax : 886-2-7197502
All
Winbond Electronics North America Corp.
Tel : 1-408-9436666
Fax : 1-408-9436668
Winbond Electronics H.K. Ltd.
Tel : 852-27513100
Fax : 852-27552064
trademarks are property of their respective holders.
Sg8
V
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