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Seiko G1216 User`s manual
AN.No.G1216B1N000-3D0E
LIQUID CRYSTAL DISPLAY MODULE
G1216B1N000
USER’S MANUAL
Seiko Instruments Inc.
AN.No.G1216B1N000-3D0E
This manual provides technical information covering functions and operational
instructions for the G1216 liquid crystal display modules made by Seiko
Instruments Inc. Please read through this manual before operating the product.
Distribution of this manual to third parties for any purpose other than operation of
the product is prohibited. The descriptions herein are subject to change without
prior notice.
Revision Record
Version
Revision
Date
1
Original
December 1993
Copyright 1993 by Seiko Instruments Inc.
Printed in Japan
-i-
AN.No.G1216B1N000-3D0E
CONTENTS
1.
2.
3.
4.
GENERAL
1.1
General .....................................................................................................
1
1.2
Features....................................................................................................
1
1.3
Absolute Maximum Ratings (excluding LED backlight)............................
2
1.4
Mechanical Characteristics.......................................................................
2
1.5
Electrical Characteristics (excluding LED backlight) ...............................
2
1.6
Optical Characteristics..............................................................................
3
1.7
LC Panel Life Time ...................................................................................
4
1.8
LED Backlight Characteristics ..................................................................
4
1.9
Dimensions ...............................................................................................
6
CIRCUIT CONFIGURATION
2.1
Block Diagram ..........................................................................................
7
2.2
Segment Drivers (HD61202) ....................................................................
7
2.3
Common Driver (HD61203)......................................................................
13
2.4
Bias Voltage Generator ............................................................................
13
OPERATING INSTRUCTIONS
3.1
Terminal Functions ...................................................................................
14
3.2
Timing Characteristics ..............................................................................
15
3.3
Reset Function .........................................................................................
16
3.4
Instructions ...............................................................................................
17
3.5
Contrast Adjustment and Power Supply Example ...................................
21
3.6
LED Backlight Driver Example .................................................................
21
3.7
MPU Connection Diagram........................................................................
23
PRECAUTIONS...................................................................................................
24
INDEX
- ii -
AN.No.G1216B1N000-3D0E
1. GENERAL
1.1 General
The G1216 is a very thin LCD module on which a full-dot matrix LCD panel and a CMOS IC driver are
integrated. The LCD panel used here features wide viewing angle and high contrast.
This full dot
configuration allows a wide variety of patterns to be displayed depending upon the input data.
The
display position is the intersection point of the matrix transparent electrodes. This prevents display
distortion and displacement. Incorporating a display RAM and a display timing signal generator into
the G1216 allows for direct connection with the MPU circuit without using an LCD controller.
1.2 Features
12864 full dot matrix configuration
1/64 duty, 1/9 bias
Two 4096-bit internal display data RAMs
An internal display timing signal generator
8-bit parallel interface
Instructions:
Display Data Read/Write, Display ON/OFF, Display Start Line, X-Address (Page) Set, Y- Address
Set, and Status Read.
Three types of power supply: VDD=+5 V, VLC , LEDA (LED anode)
Transflective, gray mode
Positive display
Display data “H”: Display ON: blue display color
Display data “L”: Display OFF: gray background
A wide operating temperature range
A built-in LED backlight (color: yellow-green)
-1-
AN.No.G1216B1N000-3D0E
1.3 Absolute Maximum Ratings (excluding LED backlight)
Vss = 0 V
Item
Symbol
Conditions
Min.
Max.
Unit
Power supply
VDD
Ta = 25C
-0.3
7.0
V
voltage
Input voltage
VLC
VIN
5010%RH
VDD -19.0
-0.3
VDD + 0.3
VDD+ 0.3
V
V
-20
+70
C
-30
+80
C
+20
+20
+85
+65
%RH
%RH
Operating
temperature
Storage
temperature
Storage
humidity
Topr
65%RH
Tstg
48 hrs
1000 hrs
1.4 Mechanical Characteristics
Item
Standard
12864 dot
Dot configuration
Module dimensions ( H V T )
[ mm ]
75.0 52.7 8.9
Viewing area ( H V )
[ mm ]
60.0 32.5
Active display area ( H V )
[ mm ]
55.01 27.49
Dot dimensions ( H V )
[ mm ]
0.4 0.4
Dot pitch ( H V )
[ mm ]
0.43 0.43
Weight
[ g ]
45 max.
H : Horizontal
V : Vertical
T : Thickness (max.)
1.5 Electrical Characteristics (excluding LED backlight)
VDD = 5 V5%, VSS = 0 V, Ta = -20C to +70C
Item
Symbol
Conditions
Min.
Typ.
Max.
Unit
Input
voltage1
High
VIHC
0.7VDD
VDD
V
Low
VILC
0
0.3VDD
V
Input
voltage2
High
VIHT
2.0
VDD
V
Low
VILT
0
0.8
V
Output
voltage3
High
VOH
IOH =- 205 A
2.4
V
Low
VOL
IOL = 1.6 mA
0.4
V
VDD
4.75
5.00
5.25
V
VLC
-12.0
-8.0
-3.0
V
IDD
VDD=5 V, Ta = 25C
2.0
3.0
mA
ILC
VLC = 8.0
1.8
3.0
mA
fFRM
71.4
HZ
Power supply voltage
Current
consumption4
Frame frequency
1
Applied to RST.
2
Applied to DB0 to DB7, E, R/W, D/I, CS1 and CS2.
3
Applied to DB0 to DB7.
4
Display patterns: checkered patterns.
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AN.No.G1216B1N000-3D0E
1.6 Optical Characteristics
1/64 duty, 1/9 bias, fFRM = 71.4 Hz, Vopr = VDD -VLC , LED backlight: OFF
Item
Sym.
Conditions
θ1
C ≥ 2.0
∅ = 0°
Vopr=13.0 V
θ2
Viewing angle
θ2-θ1
θ1
C ≥ 2.0
∅ = 270°
Vopr=13.0 V
θ2
θ2-θ1
Contrast
θ = 0°
∅ = 0°
Vopr=13.0 V
θ = 0°
∅ = 0°
Vopr=13.0 V
θ = 0°
∅ = 0°
Vopr=14.0 V
C
ton
toff
Response time
ton
toff
Temp.
25°C
25°C
25°C
25°C
-20°C
Min.
Typ.
Max.


-15
15


30




-20
50


70


2.5
3.5


40
100

100
200

630
1000

2300
3500
Unit
Remark
Degree
Refer to notes
1 and 2

Note 3
ms
Note 4
Measuring instrument : Canon illuminometer LC-3S
Note 1: Definition of angle θ and ∅
Light
Z (θ=0°)
(reflective LCD)
θ
θ1
Y’(∅=180°)
Note 2: Definition of viewing angles θ 1
and θ 2
Cmax.
Sensor
θ2
Contrast C
2.0
LCD panel
X’
X (∅=90°)
θ1
Z’
θ2
Viewing angle
∅
Remark:
Y (∅=0°)
(θ=90°)
-3-
The optimum viewing angle by visual
inspection and angle θ at Cmax do
not always match.
AN.No.G1216B1N000-3D0E
Note 4: Definition of response time
Note 3: Definition of contrast (C)
Vopr
(V)
Brightness of non-selected dot (reflection) B2
C=
Brightness of selected dot (reflection)
Brightness for selected
dot
B2
(%)
B1
1/fFRM
Selected status
(display ON)
Non-selected
status
Brightness
curve for nonselected dot
Brightness
(reflection)
Light
Brightness
B1
10%
90%
100%
Dark
ton
0
Operating
Vopr
fFRM
voltage(V)
Non-selected status
(display OFF)
: Operating voltage
: Frame frequency
toff
ton : Response time (rise)
tof : Response time (fall)
Note: Measurement must be made using a transmissive LCD panel.
1.7 LC panel life time
Item
Conditions
25°C±10°C
<65%RH
Life time1
1
Standard
Unit
100,000 or more
hrs
Definition of life time: the time up to occurrence of any of the following:
ž Contrast reduces to 30% of the initial value.
ž Current consumption becomes three times the initial value.
ž Orientation deteriorates significantly.
ž The display malfunctions.
1.8 LED backlight characteristics
(1) Absolute maximum ratings
*
Item
Symbol
Standard
Unit
DC forward current
IF
200*
mA
DC reverse voltage
VR
8
V
Allowable dissipation
PD
860
mW
Operating temp. range
Topr
−20 to +70
°C
Storage temp. range
Tstg
−30 to +80
°C
Forward current reduction characteristics: The absolute maximum rating of the forward current
varies depending on ambient temperature.
200
IF ( mA )
50
−20
25
70
-4-
Ta (°C)
AN.No.G1216B1N000-3D0E
(2) Electrical and optical characteristics
Ta = 25°C
Item
Symbol
Meas. condition
Min.
Typ.
Max.
Unit
Forward voltage
VF
IF=90 mA
3.8
4.1
4.4
V
Reverse current
IR
VR=8 V


0.9
mA
(3) LED backlight connection diagram
LEDA
Number of LED
chips=20
LEDC
(4) Brightness (panel upper side)
Item
Surface brightness
(Center of LCD panel)
Symbol
Min.
Typ.
Max.
Unit
BP
1.0
2.0

nit
Measurement conditions and a measuring instrument are:
ž Ta=25°C±3°C
ž 30 to 85%RH
ž IF= 90 mA
ž f FRM=71.4 Hz
ž VLC: Optimum LC drive voltage
ž Display OFF (Entire display data=“L”)
ž Measured 30 minutes after LED lights
ž Measuring instrument: BM - 7 (TOPCON)
(5) Life time
Item
Life time1
1
Measurement conditions
Ta=25°C±10°C
IF=90 mA
Standard
Unit
50,000 or more
hrs
Definition of life time: The time until the brightness decreases to one half the initial
brightness.
-5-
AN.No.G1216B1N000-3D0E
1.9 Dimensions
Unit: mm
General dimensional tolerance:±0.5
Figure 1 Dimensions
I/O terminal functions
1
No.
Sym.
1
2
3
4
5
6
7
8
9
10
VDD
VSS
VLC
DB0
DB1
DB2
DB3
DB4
DB5
DB6
Functions
Power supply voltage: +5.0 V
GND: 0 V
LC drive voltage
Data bus (LSB)
Data bus
Data bus
Data bus
Data bus
Data bus
Data bus
No.
Sym.
11
12
13
14
15
16
17
18
19
20
DB7
CS1
CS2
RST
R/W
D/I
E
FGND
LEDA
LEDC
Functions
Data bus (MSB)
Chip select (1)
Chip select (2)
Reset
Read/Write
Data/Instruction
Enable
Frame ground1
LED anode
LED cathode
FGND is connected to the metallic frame of the module. Use this frame when grounding.
-6-
AN.No.G1216B1N000-3D0E
2. CIRCUIT CONFIGURATION
2.1 Block Diagram
This product consists of two HD61202 segment drivers, an HD61203 common driver and a bias
voltage generator. Figure 2 shows the block diagram.
DB0 to DB7
RST, R/W, D / I, E
CS2
CS1
VLC
Bias Voltage
Va, Vc, Vd, Vf
Generator
VDD
VSS
Va
Vb
Ve
Vf
FRM
Segment Driver 1
Segment Driver 2
64
64
M
CL2
1
2
Common Driver
64
12864 full dot matrix LCD
LEDA
LED Backlight
LEDC
Figure 2 Block Diagram
2.2 Segment Drivers (HD61202)
The segment driver is a 64 drive output CMOS IC. The G1216 is driven with the panel divided into
two right and left displays. A segment driver controls the divided screen. 8 bits of data transmitted
from the MPU are saved in the internal display RAM, and the segment signal is generated to drive the
LC. 1 bit of display RAM data corresponds to 1 dot lighting or non-lighting on the LC panel.
-7-
AN.No.G1216B1N000-3D0E
2.2.1
Block Diagram (Segment Driver)
VDD
RST
VSS
CS
VLC
R/W
D/I
DB0 to DB7
E
8
Segment Driver
Interface Control
Input and Output Buffer
Busy Flag
8
8
Output
Register
Input
Register
Instruction Register
9
6
Display ON/OFF
8
Display Start Line
Register
X, Y-Address
Counter
8
6
Z-Address
Counter
9
Display Data RAM
4096 bit
6
64
Display Data Latch
64
4
LC Driver
1
2
FRM
CL
Va
Vc
Vd
Vf
M
Y1 Y2
Figure 3 Segment Driver
-8-
Y64
AN.No.G1216B1N000-3D0E
2.2.2
(1)
Functions and Operations of Main Blocks
Interface Control Unit
The interface control unit consists of the following blocks:
Input and output buffer
Input and output register
Instruction register
The above blocks are selected according to the following combinations of R/W and D/I signals:
D/I
R/W
Functions
1
1
Output Register Read
Internal Operation (Display Data RAM
1
0
Input Register Write
Internal Operation (Input Resister
0
1
Busy Check and Status Read
0
0
Instruction
Output Register)
Display Data RAM)
Input and output buffer
The data is transmitted through eight data buses (DB0 to DB7).
DB7 ....... MSB (most significant bit)
DB0 ...... LSB (least significant bit)
The data can be input and output only when the Chip Select is selected. Therefore, if the Chip Select
is not selected, the internal condition remains unchanged and instruction will not be executed, even
when changing the signal of the input terminals excluding the RST (reset) terminal.
Note that the RST operates regardless of CS1 and CS2.
Input and output register
This product is provided with an input register and an output register so that the product can interface
with MPUs having speed differing from the internal operation.
Input register
The input register is a register that is used for temporarily storing the data to be written in the display
data RAM. The data to be written from the MPU to the input register will be automatically written in
the display data RAM through internal operation.
When the Chip Select is selected and R / W = 0, D / I =0, the data is written in the register,
synchronized with the fall of signal E.
Output register
The output register is a register that is used for temporarily storing the data to be read from the
display data RAM.
-9-
AN.No.G1216B1N000-3D0E
In order to read the content of the output register, the Chip Select must be selected, D/I must be 1,
and R/W must be 1. When executing the “Read” instruction, the contents of the output register
stored at that time are output during the time that “E” is 1. When “E” falls, display data of the
currently indicated address is written in the output register. After that, the address advances by
one.
The contents of the output register are rewritten by the Read instruction. The data is retained by the
address set or other instructions. Accordingly, when performing the address set, and next executing
the Read instruction, the data of the specified address is not output and the data of the address
which is specified is output at the second data read time. Therefore, when setting the address, a
dummy read is needed once. See Figure 4.
D/I
R/W
E
Address
N
Output Register
DB0 to DB7
Busy
Check
Address
Set
(Address
N)
Busy
Check
N+2
N+1
Data Read
(dummy)
N address data
Data Read
(N address
data)
Busy
Check
N+1 address data
Busy
Check
Data Read
(N+1 address
data)
Figure 4 Read Timing
(2)
Busy flag
The status when busy flag is “1” means that the module is operating internally. Instructions other than
he Status Read are not available at this time. The busy flag is output to DB7 by the Status Read
instruction. Ensure that the busy flag is “0” before executing the instruction.
E
BUSY
1
F T
T
BUSY BUSY
3
F
F is frequency of 1 or 2 (1 / 2 the source oscillation frequency of HD61203): 215 kHz typ.
Figure 5 Busy Flag
(3)
Display ON/OFF Flip/Flop
The display ON/OFF Flip/Flop is a flip-flop function that determines whether the display data
corresponding to the RAM data is output to the segment on the LCD (ON status ) or goes to all nonlit
status regardless of the RAM data (OFF status). This is controlled by the display ON/OFF instruction.
When the RST signal becomes “0,” the display goes to OFF status. This flip-flop status is output to DB5
by the Status Read instruction.
Even when performing display ON/OFF, the data inside the RAM is not affected.
- 10 -
AN.No.G1216B1N000-3D0E
(4)
Display start line register
The display start line register is a register which determines the line address (see Figure 6) for which
data is displayed on the top line of the LCD screen when displaying the contents of the display data
RAM on the LCD screen. It is also used to scroll the display. The 6 bit (0 to 63) display start line
information is written in this register by the Display Start Line Set Instruction.
The contents of this register are transmitted to address counter Z at “H” level of the FRM signal
(common driver output) which indicates the display start on the screen.
(5)
Z-address counter
The Z-address counter generates the address to output the display data synchronized with the
common signal. This is a 6-bit counter which counts at the fall of the CL signal (common driver output).
The contents of the display start line register are preset to the Z-address counter at “H” level of the
FRM signal (common driver output).
(6)
Display data RAM
The display data RAM is a RAM that stores the display dot data. 1 bit of RAM data corresponds to
lighting (data=1) or non-lighting (data = 0) of 1 dot of the display on the LCD screen.
Figure 6 shows
the relationship between the address and data inside the RAM on either the right or left screen (64 64
dots).
In this case, the display start line is 0.
- 11 -
AN.No.G1216B1N000-3D0E
COM1
COM2
COM3
COM4
COM5
COM6
COM7
COM8
COM9
Display pattern
(Display start line: 0)
Common driver
output
X1 to X64
COM62
COM63
COM64
Segment driver output
Y1 to Y64
1 2 3 4 5
62 63 64
Line address
Data inside
display RAM
DB0(LSB)
DB1
DB2
DB3
DB4
DB5
DB6
DB7(MSB)
0
1
1
1
1
1
1
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
0
1
1
1
1
1
1
0
0
0
0
1
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
1
1
1
1
1
1
0
0
Line 0
Line 1
Line 2
X- address
(page)
X=0
X=1
X=2
0
0 1
1 1
0 0
Y-address
1
0
1
0
0
0
1
0
0
0
1
0
Y0 Y1 Y2 Y3 Y4
0
0 0 0
0 0 0
0 0 0
Line 62
Line 63
X=7
Y61Y62Y63
Figure 6 Relationship Between Display and Data Inside Display RAM
(7)
X, Y- address counter
X, Y-address counter is a 9-bit counter which gives the address of the internal display data RAM. It is
necessary to set the X-address counter of the three upper bits, and the Y-address counter of the six
lower bits using differing instructions.
X-address counter
Address counter X is a simple register that is not provided with a count function. The address is set
by instruction.
- 12 -
AN.No.G1216B1N000-3D0E
Y-address counter
This counter sets the address by instruction and is automatically advanced by the read/write
operation. Counting is performed by looping the values 0 to 63.
2.3 Common driver (HD61203)
The common driver is a 64 drive output CMOS IC. Incorporating an oscillation circuit, this driver
generates the common signal and timing signals (LC AC drive control, and one-frame timing signal)
necessary for the LC display, and controls the display by supplying the timing signals to the segment
drivers.
2.4 Bias voltage generator
Six levels of standard voltage Va to Vf are applied to the drivers as a bias voltage. This voltage is
generated by resistance division of Vopr and driven by a voltage follower through an operational
amplifier.
VDD
Va
R1
C
Vb
+
R1
C
Vc
+
Vopr
R2
C
Vd
+
R1
C
Ve
+
R1
Operational
Amplifier
C
Vf
VLC
1 / 9 bias: R2= (9 4) R1= 5 R1
Figure 7 Bias Voltage Generator
- 13 -
AN.No.G1216B1N000-3D0E
3. OPERATING INSTRUCTIONS
3.1 Terminal Functions
Table 1 Terminal Functions
Signal
QTY
I/O
Destination
to
8
I/O
MPU
Common terminal for tristate input and output, and data bus.
E
1
Input
MPU
Enable
Write (R/W=0):Latches data of DB0 to DB7 at the fall of E.
Read (R/W=1):Outputs data to DB0 to DB7 while “E” keeps a
high level.
R/W
1
Input
MPU
Read/Write selection
R/W=1: When E=1 and CS1=0 or CS2=0, the data is output
to DB0 to DB7 and read is available by MPU.
R/W=0: When CS1=0 or CS2=0, DB0 to DB7 are ready for
receiving the input.
D/I
1
Input
MPU
Data/Instruction selection
D/I=1: Indicates that the data in DB0 to DB7 is the display
data.
D/I=0: Indicates that the data in DB0 to DB7 is the instruction
code.
CS1, CS2
2
Input
MPU
DB0
DB7
Functions
Chip select input. Data input and output is possible under
the following status:
LCM display screen
Terminal No.
CS1
CS2
Status
0
0
CS1
CS2
CS1: Controls the LCM left half display screen (SEG1 to
SEG64).
CS2: Controls the LCM right half display screen (SEG65 to
SEG128).
1
RST
1
VDD
1
VSS
1
VLC
1
LEDA
1
LEDC
1
FGND
1
Input
MPU
Reset signal
Setting the RST signal to a low level allows for initial setup.
(1) ON /OFF register: 0 setup (display OFF)
(2) Display start line register: 0 line setup (display starts
from 0 line)
The setup status is retained until the status is changed by an
instruction after reset is released.
Power
Power terminal for logic (+5 V)
Power
GND terminal (0 V)
Power
Power terminal for LC drive
Power
LED backlight anode terminal
Power
LED backlight cathode terminal
Frame ground1
FGND terminal is connected to the metallic frame of the module. Use this terminal when
grounding the frame.
- 14 -
AN.No.G1216B1N000-3D0E
3.2 Timing Characteristics
Item
Symbol
Min.
E cycle time
tCYC
1000
E pulse width (H)
PWEH
450
E pulse width (L)
PWEL
450
E rise time
tr
E fall time
tf
Address setup time
tAS
140
Address hold time
tAH
10
Data setup time
tDSW
Data delay time
tDDR
Data hold time during write
tDHW
10
Data hold time during read
tDHR
20
Typ.
200
Note 1: When the MPU writes:
Max.
unit
Note
ns
1, 2
ns
1, 2
ns
1, 2
25
ns
1, 2
25
ns
1, 2
ns
1, 2
ns
1, 2
ns
1
ns
2, 3
ns
1
ns
2
320
Note 2: When the MPU reads:
tCYC
E
2.0V
0.8V
tCYC
PWEH
PWEL
tr
2.0V
0.8V
R/W
CS1, CS2
D/I
tAS
E
tf
2.0V
0.8V
tr
tAH
R/W
tAS
CS1, CS2
D/I
tDHW
2.0V
0.8V
tAH
tAH
2.0V
0.8V
tDDR
DB0 to DB7
Note 3: Load circuits (DB0 to DB7)
D1
Test point
C
R
RL
D2
D3
D4
tf
tAS
tAS
tDSW
DB0 to DB7
2.0V
0.8V
tAH
2.0V
0.8V
PWEH
PWEL
RL = 2.4 k
R = 11 k
C = 130 pF (including jig capacity)
Diodes D1 to D4 are 1S2074 H .
- 15 -
2.4V
0.4V
tDHR
AN.No.G1216B1N000-3D0E
3.3 Reset Function
Setting the RST terminal to a low level when the power is on allows for initial setup.
Display OFF
Display start line register: Set address 0.
While the RST remains at a low level, instructions other than the status read cannot be accepted.
Execute other instructions after confirming that DB4=0 (reset release) and DB7=0 (ready) , using the
status read instruction.
The power conditions for power-on initial setup are as follows:.
Item
Symbol
Min
Reset time
tRST
1.0
Rise time
tr
Typ.
Max
unit
200
ns
s
4.5V
VDD
tRST
tr
0.7VDD
0.3VDD
RST
If the RESET is executed during operation, retention of the contents of all registers (excluding an
ON/OFF register) and the RAM is not guaranteed. Always set them again.
- 16 -
AN.No.G1216B1N000-3D0E
3.4 Instructions
3.4.1 General
Instructions are listed on Table 2. Instructions other than the Status Read instruction will not be
executed if they are sent while another instruction is already being executed. The busy flag is “1”
when executing the instruction.
Check whether or not the flag is “1” before transmitting the
instructions from the MPU.
Table 2 List of Instructions
Code
Instruction
1
Display
Function
R/W
D/I
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
0
0
0
0
1
1
1
1
1
1/0
0
0
1
1
ON / OFF
2
Display start
( 0 to 63 )
3
X-address
(page) set
0
0
1
0
4
Y-address
0
0
0
1
1
1
6
7
X-address(page)
(0 to 7)
1
Sets the X-address of the RAM (page) in the
X-address (page) register.
Set Y-address of the RAM in the Y-address
counter.
Y-address
set
5
Determines the RAM line to be displayed on the
top line (COM1) on the display.
Display start lines
line
Turns ON / OFF total display. Data and
internal status in the display RAM remain
unchanged.
1: ON 0 : OFF
( 0 to 63 )
Status read
Display data
write
Display data
read
1
0
1
B
U
S
Y
0
0
R
E
S
E
T
ON
/
OFF
1
0
0
0
0
Writes data DB0 (LSB) to
DB7 (MSB ) on the data
bus into the display RAM.
Write Data
1
Reads the status.
RESET 1: Reset 0: Normal
ON/OFF 1: Display OFF 0: Display ON
BUSY
1: during internal operation
0: READY status
Reads data DB0 (LSB) to
DB7 (MSB) from the
display RAM into the data
bus.
Read Data
Accesses the
RAM in which
address has been
specified
beforehand. After
that the Y-address
advances by one.
Note: The BUSY time varies depending upon the frequency F (:215 kHz (typ.) ) of 1, 2 (1/F TBUSY 3/F).
3.4.2 Detailed explanation
(1) Display ON/OFF
R/W D/I
Code
0
0
DB7
0
DB0
0
1
1
1
1
1
D
Turns the display ON when D=1, and OFF when D=0. When the display is turned OFF by D=0, the
original display appears if D is set to 1 because the display data is retained in the display data RAM.
- 17 -
AN.No.G1216B1N000-3D0E
(2) Display start line
R/W D/I
Code
0
0
DB7
1
DB0
1
A
A
A
A
A
A
Lower bits
Upper bits
Sets the display data RAM line address expressed with binary AAAAAA in the display start line
register. When displaying the content of the display data RAM, the display data on the line addresses
which are set in the register is displayed on the top line on the LCD screen. For address configuration
inside the display data, refer to Figure 6. Figure 8 shows display examples of start lines 0 to 3.
COM1
COM1
COM2
COM2
COM3
COM3
COM4
COM4
COM5
COM5
COM6
COM6
COM7
COM7
COM8
COM8
COM9
COM9
COM10
COM10
-
-
-
-
-
-
COM59
COM59
COM60
COM60
COM61
COM61
COM62
COM62
COM63
COM63
COM64
COM64
Display start line=0
Display start line=1
COM1
COM1
COM2
COM2
COM3
COM3
COM4
COM4
COM5
COM5
COM6
COM6
COM7
COM7
COM8
COM8
COM9
COM9
COM10
COM10
-
-
-
-
-
-
COM59
COM59
COM60
COM60
COM61
COM61
COM62
COM62
COM63
COM63
COM64
COM64
Display start line =2
Display start line=3
Figure 8 Relationship Between Display Start Lines and Displays
- 18 -
AN.No.G1216B1N000-3D0E
(3) X-address (page) set
R/W D/I
Code
0
DB7
0
DB0
1
0
1
1
1
A
A
A
Upper bits
Lower bits
The display data RAM “X” address (page) which is expressed with binary AAA is set in the X-address
register. Following write/read operations from the MPU are performed on the specified X-address
(page) until the next X-address (page) set is performed. The configuration of display data RAM and
X-address is shown in Figure 9.
R/W D/I
Code
0
DB7
0
DB0
0
1
A
A
A
A
Upper bits
A
A
Lower bits
(4) Y-address set
The display data RAM Y- address which is expressed with binary AAAAAA is set in the Y-address
counter.
After that the Y-address counter advances by one each time write/read is performed from
the MPU. The configuration of the display data RAM and Y-address is shown in Figure 9.
Y-address
0
1
2
3
4
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
61 62 63
DB0
to
Page 0
X=0
Page 1
X=1
Page 6
X=6
Page 7
X=7
DB7
DB0
to
DB7
DB0
to
DB7
DB0
to
DB7
Figure 9 Display Data RAM Address Configuration
- 19 -
AN.No.G1216B1N000-3D0E
(5) Status read
R/W D/I
Code
BUSY:
1
0
DB7
BUSY
DB0
0
ON/OFF RESET
0
0
0
0
When BUSY=1, it means that the the module is operating internally and the next instruction is
not accepted until BUSY=0. After confirming that BUSY=0, it is necessary to perform the
next write.
ON/OFF: Indicates that the display is OFF when ON/OFF=1.
Indicates that the display is ON when ON/OFF=0.
RESET:
Indicates that initial setup is performed by the RST signal.
Indicates that the initialization is being performed when RESET=1 and instructions other than
the Status Read instruction are not accepted.
When RESET=0, initialization is completed and operation status is normal.
(6) Display data write
R/W D/I
Code
0
1
DB7
D
DB0
D
D
D
D
D
Upper bits
D
D
Lower bits
Writes 8-bit binary data DDDDDDDD in the display data RAM. After the write is completed, the Yaddress is automatically advanced by one
(7) Display data read
R/W D/I
code
1
1
DB7
D
DB0
D
D
D
Upper bits
D
D
D
D
Lower bits
Read 8-bit binary data DDDDDDDD from the display data RAM.
After read is performed, the Y-
address is automatically advanced by one. A dummy read is necessary once, immediately after the
address set is completed. For details, refer to segment driver output register section.
- 20 -
AN.No.G1216B1N000-3D0E
3.5 Contrast Adjustment and Power Supply Example
The LC panel viewing angle and display screen contrast are greatly affected by the ambient
temperature.
The recommended LC drive voltage (Vopr) at each temperature is given below.
is a value at which the best display is visually obtained.
Vopr
This value does not always correspond to the
value at which the best contrast (Cmax.) is obtained. A contrast adjustment circuit example is shown
below:
Vopr= VDD − VLC
Temperature (°C)
−20
0
25
50
70
Voltage (Vopr)
13.5
13.0
12.5
11.5
10.5
VDD
RA=10 kΩ
C1
5V
RB=1.2 kΩ
VSS
C2
12 V
RV (variable resistor)
RA
=10 kΩ
RV
C1, C2=10 µF
VLC
G1216
RB
Figure 10
Contrast Adjustment
3.6 LED Backlight Driver Examples
(1) Example 1
A basic LED backlight driver example is shown in Figure 11.
VIN = +5V
R=30Ω, (≥1/4W)
LEDA
LEDC
Figure 11
G1216
LED Backlight Driver Example 1
Where resistance “R” is the limit resistance of the LED forward current.
upon the temperature.
The forward current depends
Especially, it must be decreased at high temperature.
For temperature
dependence, refer to forward current reduction characteristics described in 1.8 (1). The operating
temperature for the G1216 ranges from −20°C to +70°C.
It is necessary to determine limit resistance
“R” so that the forward current becomes 50 mA or lower at +70°C.
Forward voltage VF at each temperature of the LED backlight is shown in Table 3.
Table 3
Forward Voltage At Temperatures
Temperature (Ta)
Conditions
VF min.
VF typ.
VF max.
−20°C
IF=90 mA
3.9 V
4.3 V
4.6 V
+25°C
IF=90 mA
3.8 V
4.1 V
4.4 V
+70°C
IF=50 mA
3.5 V
3.7 V
3.9 V
- 21 -
AN.No.G1216B1N000-3D0E
Limit resistance “R” is calculated using the following equation. The resistance becomes the value
shown in Figure 11.
R=
VIN − VF
IF
VIN =Input voltage (power voltage)(V)
VF =LED forward voltage (V)
IF =Allowable LED forward current (A)
(Ω)
For this resistance value, the forward current becomes lower than 50 mA at 25°C.
The surface
brightness of the LED backlight varies with the forward current. See Figure 12. Compared with 1.8 (4)
brightness (IF=90 mA), the brightness is about 40%.
1.2
1.0
0.8
Relative
brightness
0.6
0.5
0.4
0.2
30
Figure 12
40
50
60
70
80
90 100 110
Forward current:
IF(mA)
Forward Current-Brightness Characteristics (Ta=25°C)
(2) Example 2
When you want to keep the brightness (2 nit) at 25°C, use a thermosensitive element, like a thermistor,
and a transistor as shown in Figure 13.
Set the thermosensitive element to about IF=90 mA at 25°C
and configure it so that “IF” will be reduced as the temperature rises.
LEDA
R2
LEDC
VIN
G1216
Tr
R3
Thermistor
R1
R4
Figure 13
LED Backlight Driver Example 2
- 22 -
AN.No.G1216B1N000-3D0E
3.7 MPU Connection Diagram
Z80A
Z80 PIO
D0 to D7
D0 to D7
A0 to A15
Decoder
A0
A1
G1216
A0 to A7
DB0 to DB7
CE
B0
E
C/D
A/B
B1
R/W
B2
D/I
RD
RD
IORQ
IORQ
B3
RST
M1
INT
M1
INT
B4
CS1
B5
CS2
VDD
VSS
VLC
Figure 14 Example of Connection to Z80A
- 23 -
AN.No.G1216B1N000-3D0E
4. PRECAUTIONS
Safety
If the LCD panel is damaged, be careful not to get the liquid crystal in your mouth. If the liquid
crystal touches your skin or clothes, promptly wash it off using soap and plenty of water.
Handling
Avoid static electricity, as it will damage the CMOS LSI.
The LCD panel is made of plate glass. Do not hit or crush it.
Do not remove the panel or frame from the module.
The polarizer of the display is very fragile. Handle it very carefully.
Mounting and design
Mount the module by using the specified mounting parts and holes.
To protect the module against external pressure, place a transparent plate (e.g., acrylic or glass)
on the module, leaving a small gap between the display surface and transparent plate.
Small gap
✩Example
Exterior face
Transparent plate
Module
Screw
Design the system so that no input signal is given unless the power-supply voltage is applied.
Keep the module dry. Avoid condensation to prevent the transparent electrodes from being
damaged.
Storage
Store the module in a dark place, where the temperature is 25C 10C and the relative humidity
below 65%.
Do not store the module near organic solvents or corrosive gases.
Keep the module (including accessories) safe from vibration, shock and external pressure.
Cleaning
Do not wipe the polarizer with a dry cloth, as it may scratch the surface.
Wipe the module gently with a soft cloth soaked with a petroleum benzine.
Do not use ketonic (ketone) solvents (ketone and acetone) or aromatic solvents (toluene and
xylene), as they may damage the polarizer.
- 24 -
AN.No.G1216B1N000-3D0E
INDEX
-AActive display area ............................................................................. 2
-BBias voltage generator ................................................................. 7, 13
Block diagram................................................................................. 7, 8
Busy flag....................................................................................... 8, 10
-CChip select................................................................................ 6, 9, 14
Cleaning ........................................................................................... 24
Common driver ............................................................................. 7, 13
Contrast ........................................................................................ 3, 21
Contrast adjustment ......................................................................... 21
Current consumption .......................................................................... 2
-DDefinition of contrast........................................................................... 4
Definition of response time................................................................ 4
Definition of viewing angles................................................................ 3
Display data RAM................................... 1, 8, 9, 11, 12, 17, 18, 19, 20
Display data read ....................................................................... 17, 20
Display data write ....................................................................... 17, 20
Display ON/OFF ........................................................................... 8, 17
Display ON/OFF flip-flop ................................................................. 10
Display start line ........................................................ 8, 11, 12, 17, 18
Display start line register .............................................................. 8, 11
Dot dimensions................................................................................... 2
Dot pitch ............................................................................................. 2
-EEnable .......................................................................................... 6, 14
-FFrame frequency ................................................................................ 2
-IInput and output buffer .................................................................. 8, 9
Input register ................................................................................. 8, 9
Input voltage ................................................................................. 2, 22
AN.No.G1216B1N000-3D0E
-LLC drive voltage ........................................................................... 6, 21
LC panel life time................................................................................ 4
LED backlight characteristics ............................................................. 4
-OOperating temperature ....................................................................... 2
Output register............................................................................... 8, 9
Output voltage .................................................................................... 2
-P Power supply example ..................................................................... 21
Power supply voltage ............................................................... 2, 6, 24
-RRecommended LC drive voltage...................................................... 21
Reset .................................................................................. 6, 9, 14, 16
Response time ................................................................................... 3
-SSegment driver ............................................................................... 7, 8
Status read ................................................................ 9, 10, 16, 17, 20
Storage ............................................................................................. 24
Storage humidity................................................................................. 2
Storage temperature ......................................................................... 2
- TTerminal functions ........................................................................... 14
-VViewing angle ..................................................................................... 3
Viewing area....................................................................................... 2
-WWeight ................................................................................................ 2
- XX-address counter ............................................................................ 12
X, Y-address counter.................................................................... 8, 12
-YY-address counter ...................................................................... 12, 13
-ZZ-address counter ........................................................................ 8, 11
Z80A ................................................................................................. 23
Seiko Instruments Inc.
Head Office
Components Overseas Marketing & Sales Department
1-8, Nakase, Mihama-ku, Chiba-shi, Chiba 261, Japan
Phone: 043-211-1213 FAX: 043-211-8035
Seiko Instruments U.S.A. Inc.
Electronic Components Division
2990 W. Lomita Blvd., Torrance Calif. 90505, USA Phone: 310-517-7770 FAX: 310- 517-7792
Seiko Instruments GmbH
Siemensstrasse 9b, 63263 Neu-Isenburg, Germany Phone: 49-6102-297-0 FAX: 49-6102-297-222
Seiko Instruments ( H. K. ) Ltd. Sales Division
4-5/F, Wyler Centre 2, 200 Tai Lin Pai Road, Kwai Chung, N.T., Kowloon, Hong Kong
Phone: 852-4218611 FAX: 852-4805479
Seiko Instruments Taiwan Inc.
5F-1 No. 99, SEC.2, Chung Shan N. Rd., Taipei 104, Taiwan, R.O.C.
Phone: 886-2-563-5001 FAX: 886-2-521-9519
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