Displaytech Ltd
LCD MODULE
32122B SERIES
Version : 1.1
P 1 of 16
PRODUCT SPECIFICATIONS
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PHYSICAL DATA
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EXTERNAL DIMENSIONS
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BLOCK DIAGRAM
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ABSOLUTE MAXIMUM RATINGS
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ELECTRICAL CHARACTERISTICS
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OPERATING PRINCIPLES
&
METHODS
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DISPLAY DATA RAM ADDRESS MAP
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ELECTRO-OPTICAL CHARACTERISTICS
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INTERFACE PIN CONNECTIONS
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CIRCUIT DIAGRAM
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RELIABILITY
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QUALITY GUARANTEE
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INSPECTION CRITERIA
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PRECAUTIONS FOR USING LCD MODULES
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USING LCD MODULES
Displaytech Ltd
Parameter
Supply voltage for logic
Supply voltage for LCD
Input voltage
Normal operating temperature
Normal storage temperature
Wide operating / storage
temperature (except FSTN)
Wide operating / storage
temperature (FSTN)
LCD MODULE
32122B SERIES
Version : 1.1
P 3 of 16
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ABSOLUTE MAXIMUM RATINGS
( Ta = 25°C )
Symbol
VDD
VLCD
VI
TOP
TST
TOP / TST
TOP / TST
Min
0
0
0
0
-10
-30
-30
Max
6.7
10
VDD
50
60
80
70
Unit
V
V
V
°C
°C
°C
°C
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ELECTRICAL CHARACTERISTICS
( VDD = +3V±10% , VSS = 0V, Ta = 25°C )
u
DC Characteristics
Parameter
Supply voltage for logic
Supply current for logic
Operating voltage for LCD
Input voltage ' H ' level
Input voltage ' L ' level
Symbol
VDD
IDD
VDD - VO
VIH
VIL
Condition
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25°C
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Min
2.7
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5.1
0.8VDD
0
Typ
3.0
0.3
5.4
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Max
4.5
1
5.7
VDD
0.2VDD
Unit
V
mA
V
V
V
l
Backlight operating information (Ta = 25°C )
Supply voltage VF (V)
LED Backlight
Min
Typ
Max
Side lit backlight Y/G (-2)
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2.1
2.6
Supply current IF (mA)
Min
Typ
Max
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120
200
u
AC Characteristics
Parameter
System cycle time
Address setup time
Address hold time
Data setup time
Data hold time
Output disable time
Access time
Enable pulse width (read)
Enable pulse width (write)
Input wave form rise time
Input wave form fall time
Symbol
t
CYC6
t
AW6
t
AH6
t
DS6
t
DH6
t
OH6
t
ACC6
t
EW
t
EW
t
r
t
f
Min.
2000
40
20
160
20
20
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200
160
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Max.
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120
180
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15
15
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Condition
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CL = 100pF
CL = 100pF
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Displaytech Ltd
LCD MODULE
32122B SERIES
Version : 1.1
P 4 of 16
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OPERATING PRINCIPLES
&
METHODS
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Control and Display Command
Command
R/W
A0
DB7 DB6 DB5 DB4 DB3 DB2 DB1
DB0
Function
Switches the entire display ON or OFF, regardless
of the display RAM’s data or the internal status.
1 : ON , 0 : OFF
*1
Display
0
0
1
1
0
Display Start Address
Determines the line of RAM data to be displayed
Start Line
( 0 ~ 31 )
at the display’s top line ( COM0 ).
Page
0
0
1
0
1
1
1
0
Page
Sets the page of the Display RAM in the Page
Address Set
( 0 ~ 3 ) Address register.
Column
0
0
0
Column Address
Sets the column of the Display RAM in the
Address Set
( 0 ~ 79 )
Column Address register.
Status Read 1
0
B A O R
0
0
0
0 Reads status.
U D N E
BUSY
0 : Ready
S C
/
S
1 : Busy
Y
O E
ADC
0 : Leftward output
F
T
1 : Rightward output
F
ON/OFF
0 : Display ON
1 : Display OFF
RESET
0 : Normal
1 : Reset
Write
0
1
Display Data
Writes the data on the data bus to Display RAM.
Display
These commands access a previously-specified
Data
address of the display RAM, after which the
column address is incremented by one.
Read
1
1
Display Data
Reads the data from the Display RAM onto the
Display
data bus. These commands access a previously-
Data
specified address of the display RAM, after which
the column address is incremented by one.
ADC Select 0
0
1
0
1
0
0
0
0
0/1 Used to reverse the correspondence between the
Display RAM’s column address and segment
driver output ports.
0 : Rightward output
1 : Leftward output
Static Drive 0
0
1
0
1
0
0
1
0
0/1 Selects normal display operation or static all-lit
ON/OFF
drive display operation.
0 : Normal display operation
1 : Static drive ( Power save ) *1
Duty Select
0
0
1
0
1
0
1
0
0
0/1 Select LCD duty cycle.
1: 1/32 , 0: 1/16
Read
0
0
1
1
1
0
0
0
0
0 Increments the column address counter by one
Modify
only when display data is written but not when it
Write
is read.
End
0
0
1
1
1
0
1
1
1
0 Cancels the Ready Modify Write mode.
Reset
0
0
1
1
1
0
0
0
1
0 Resets the Display Start Line to the 1st line in the
register. Resets the column address counter to 0
and page address register to 3.
*1. Power Save Mode is entered by selecting static drive in the Display OFF status.
Display
ON/OFF
0
0
1
0
1
0
1
1
1
0/1
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