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PDF SED1278 Data sheet ( Hoja de datos )
| Número de pieza | SED1278 | |
| Descripción | CMOS DOT MATRIX LCD CONTROLLER DRIVER | |
| Fabricantes | ETC | |
| Logotipo |  |
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SED1278
CMOS DOT MATRIX LCD CONTROLLER DRIVER
s DESCRIPTION
The SED1278 is a character LCD controller-driver, capable of driving displays as large as 2 lines of 8
characters (5 × 8 pixels), with minimum external components.
The SED1278 has an internal CGROM consisting of 240 characters (5 × 7) plus the underline cursor, JIS,
ASCII, and eight user-programmable characters in RAM.
The SED1278 has 40 segment output and 16 common output built-in. Thus, one chip is capable of displaying
up to 16 characters. The SED1278 can display one line of 48 characters using an SED1681F (80-bit output)
as an expansion segment driver.
The SED1278 is fabricated using a silicon gate CMOS technology process and features very low power
dissipation. This makes the device suitable for handheld and portable applications.
s FEATURES
• Low-power CMOS technology
• 40 segment output
• 16 common output
• Duty: 1/8 or 1/16 (set by command)
• 4/8-bit CPU data interface, TTL compatible
• Two frame AC drive wave form
• CGROM: .................................... 240 characters
• CGRAM: ........................................ 8 characters
• Display data RAM: ... 80 × 8 bits (80 characters)
• Recommended expansion segment driver:
SED1181FLA (64 output)
SED1681F (80 output)
• Built-in power on power-on reset
• Built-in RC oscillator
• Built-in LCD driver voltage-divider network
• TTL compatible CPU interface
• Supply voltage ................... Logic: 4.5V to 5.5V
LCD: 3.5V to 5.5V
• Package:
QFP5-80 pins (F0A, F0B, F0C, F0D, F0G, F0H)
Al pad (D0A, D0B, D0C, D0D, D0G, D0H)
s SYSTEM BLOCK DIAGRAM
CPU
DATA
CONTROL
40 SEG
SED1278
16 COM
20 CHAR × 2 LINES
XSCL, LP
D0
SED1181
287
1 page  
° Write cycle
Parameter
Enable cycle time
Enable “H” level pulse width
Enable rise/fall time
RS, R/W setup time
RS, R/W address hold time
Data setup time
Write data hold time
• Timing Chart
° Read cycle
RS
R/W
E
DB0 to DB7
Symbol
tcycE
tWEH
trE, tfE
tAS
tAH
tDS
tDH
SED1278
(VDD = 5.0V±10%, VSS = 0V, Ta = –20 to 75°C)
Conditions
Min Typ Max Unit
500 — — ns
220 — — ns
— — 25 ns
40 — — ns
10 — — ns
60 — — ns
10 — — ns
VIH1
VIL1
tAS
VIH1
VIH1
VIL1
tAH
VIH1
VIL1
trE
tWEH
VIH1
VIH1
tAH
tfE
VIL1
tRD tDHR
VOH1
VOL1
Significant
Data
VOH1
VOL1
tcycE
VIL1
° Write cycle
RS
R/W
E
DB0 to DB7
VIH1
VIL1
tAS
VIH1
VIL1
tAH
VIL1
VIL1
trE
tWEH
VIH1
VIH1
VIL1
tAH
tfE
VIL1
tDS tDH
VIH1
VIL1
Significant
Data
VIH1
VIL1
tcycE
VIL1
291
5 Page 
s SED1278F0B/D0B CHARACTER FONT
0
CG
0 RAM
(1)
CG
1 RAM
(2)
CG
2 RAM
(3)
CG
3 RAM
(4)
CG
4 RAM
(5)
CG
5 RAM
(6)
CG
6 RAM
(7)
CG
7 RAM
(8)
CG
8 RAM
(1)
CG
9 RAM
(2)
CG
A RAM
(3)
CG
B RAM
(4)
CG
C RAM
(5)
CG
D RAM
(6)
CG
E RAM
(7)
CG
F RAM
(8)
1
Higher 4-bit (D4 to D7) of Character Code (Hexadecimal)
2 3 4 5 6 7 8 9ABCDE
F
297
SED1278
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet SED1278.PDF ] | |
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