ST7549T Просмотр технического описания (PDF) - Sitronix Technology Co., Ltd.
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ST7549T Datasheet PDF : 52 Pages
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ST7549T
5. PINNING DESCRIPTIONS
LCD Driver outputs
Pin Name
SEG0 to SEG101
I/O
Description
No. of Pins
LCD segment driver outputs.
This display data and the M signal control the output voltage of segment
driver.
Segment drover output voltage
Display data M (Internal) Normal display Reverse display
O
H
H
V0
V2
102
H
L
VSS
V3
L
H
V2
V0
L
L
V3
VSS
Power save mode
VSS
VSS
LCD column driver outputs
This internal scanning data and M signal control the output voltage of
common driver.
Display data M(Internal) Common drover output voltage
COM0 to COM66
O
Normal display Reverse display
67
H
H
VSS
H
L
V0
L
H
V1
L
L
V4
Power save mode
VSS
COMS
Common output for the icons
O
The output signals of two pins are same. When not used, this pin should
2
be left open.
MICROPROCESSOR INTERFACE
Pin Name
I/O
Description
Microprocessor interface select input pin
No. of Pins
PS0 PS1 PS2
State
" L " " L " " L " 4 Pin-SPI MPU interface
PS[2:0]
I
" L " " L " " H " 3 Pin-SPI MPU interface
3
" L " " H " " L " 8080-series parallel MPU interface
" L " " H " " H " 6800-series parallel MPU interface
" H " "H" " H " I2C interface
CSB
RESB
A0
Chip select input pins
I
Data/instruction I/O is enabled only when CSB is " L ". When chip select
1
is non-active, DB0 to DB7 is high impedance.
There is no CSB pin in I2C interface, so this pin can fix to ” H”
I
Reset input pin
1
When RESB is " L ", initialization is executed.
It determines whether the data bits are data or a command.
I
A0=" H “: Indicates that D0 to D7 are display data.
A0=" L “: Indicates that D0 to D7 are control data.
1
There is no A0 pin in three line or I2C interface, so this pin can fix to ” H”
Ver 1.3
8/52
2005/12/06
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