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PDF 9729K Data sheet ( Hoja de datos )
| Número de pieza | 9729K | |
| Descripción | BU9729K | |
| Fabricantes | ROHM Semiconductor | |
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Hay una vista previa y un enlace de descarga de 9729K (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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Standard ICs
Segment-type LCD driver
BU9729K
The BU9729K is a driver for segmented liquid crystal displays, which enables connection with a microcomputer
through a serial interface. 4-bit common output and an internal power supply circuit for LCD drive make it possible to
configure a low-cost display system.
•Applications
Movie projectors, car audio equipment, telephones
•Features
1) Serial interface (8-bit length).
2) Display RAM: 72bits, internal (up to 72 segments
can be displayed).
3) Internal power supply circuit for liquid crystal drive.
4) Display duty: 1 / 4.
5) Low-voltage and low-current operation supported.
•Block diagram
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VLCD
LCD Driver
Bias Circuit
VC
VDD
VSS
SD
SCK
C/D
CS
Serial
Interface
Address
Counter
Display Data RAM
(DD RAM)
LCD
Segment
Driver
18bits
SEG1
SEG2
SEG18
Command / Data
Register
Command
Decoder
Timing
Generator
Common
Counter
LCD
Common
Driver
4bits
COM1
COM2
COM3
COM4
1
1 page  
Standard ICs
•Input / output circuits
Pin name I / O
SD
SCK
C/D
CS
I
Equivalent circuit
VDD
IN
GND
OSC1
OSC2
I
O
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OSC1
VDD
BU9729K
Pin name I / O
SEG1
~
SEG18
O
Equivalent circuit
VLCD
COM1
~
COM4
OUT
VLCD
GND
OSC2
GND
5
5 Page 
Standard ICs
•LCD drive waveforms
VC
COM1
V1
V2
VSS
VC
COM2
V1
V2
VSS
VC
COM3
V1
V2
VSS
VC
V1
COM4
V2
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VSS
VC
V1
V2
VSS
VC
V1
V2
VSS
VC
SEG1
V1
SEG18
V2
VSS
VC
V1
V2
VSS
VC
V1
V2
VSS
Frame interval
Fig. 7
BU9729K
COM1 COM2 COM3 COM4
00
00
(No SEGn corresponding
from COM1 to COM4 are
displayed.)
10
00
(Only SEGn corresponding
to COM1 are displayed.)
01
00
(Only SEGn corresponding
to COM2 are displayed.)
01
01
(Only SEGn corresponding
to COM2 and COM4 are
displayed.)
11
11
(All SEGn corresponding
from COM1 to COM4 are
displayed.)
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet 9729K.PDF ] | |
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