Sharp ER-A850 (serv.man2) Service Manual ▷ View online
4-8. Host interface specifications
For interface with the main CPU, the asynchronous serial communi-
cation is employed.
cation is employed.
Signal names descriptions
/EVRQ
Event request signal to the host
/IORES
IOC1 reset signal from the host
HTS
Data line from the host to the sub
STH
Data line from the sub to the host
/SCK
External clock (P)
/CTS
Transfer enable signal from the sub
IOC interface signal pins
Pin No.
Signal name
1 pin
GND
2 pin
GND
3 pin
IOTH
4 pin
HTIO
5 pin
NU (BAUD OUT)
6 pin
/EVRQ
7 pin
/CTS
8 pin
/IORES
9 pin
+5V
10 pin
+5V
IOTH
HTIO
HTIO
/SCK (P)
/CTS
/EVRQ
/IORES
Gate array
(PSC)
(PSC)
I/O
controller
controller
+5V
GND
SW
BUZZ
MODE
MCR
Host side
interface
interface
– 77 –
ER-A850 LCD unit
1. Features
1. Display content : 640
×
200 dots (Graphic type)
2. Display mode
: F-STN, transparent type, black-and-white
mode, view angle (6 0’clock), with CFL B/L,
anti-glare polarizing plate
anti-glare polarizing plate
3. Drive system
: 1/200 duty
4. Power source
: +5V, VDD –28V Max.
5. Interface
: CMOS level
2. Absolute max. ratings
Item
Symbol
Rated value
Unit
Power voltage (Logic)
V
DD
– V
SS
7.0
V
Power voltage
V
DD
– V
EE
28.0
V
Input power
Vin
V
SS
t
Vin
t
V
DD
V
Storage temperature range
Tstg
–20
∼
60
°C
Operating temperature range
Top
0
∼
50
°C
3. Mechanical dimensions
Item
Dimensions
Unit
Remark
External dimen-
sions
sions
281.5 (L)
×
116.0 (W)
×
13.6 (D) Max.
mm Excluding
connectors.
Effective display
dimensions
dimensions
246.0 (L)
×
81 (W)
mm
Dot size
0.345 (L)
×
0.345 (W)
mm
Dot pitch
0.348 (L)
×
0.348 (W)
mm
4. Optical characteristics
Item
Symbol
Measurement
conditions
Standard value
Unit
Remark
Min.
Typ.
Max.
Re-
sponse
speed
sponse
speed
Tr
Ta = 25°C
θ
= 0°C
φ
= 0°C
—
160
250
ms
Note 1
Td
—
80
150
ms
Note 3
Contrast
ratio
ratio
C
R
Ta = 25°C
θ
= 0°C
φ
= 0°
10
30
—
Note 2
Note 3
View an-
gle
gle
θ
1
Ta = 25°C
θ
1:
φ
= 0°C
10
—
—
Degree
Note 3
θ
2
θ
2:
φ
= 180°
C
R
u
1.4
20
—
—
Note 1:
Definition of response speed
Note 2:
Definition of contrast C
R
C
R
=
Select segment
brightness
(
B1
)
Non
−
select
segment
brightness
(
B2
)
Note 3:
Definition of view angle
θ
and
φ
θ
: Angle between the measuring point and the normal
φ
: Projection angle between the measuring point and Y
axis on the plane.
5. Electrical characteristics
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Power volt-
age
age
V
DD
4.5
5.0
5.5
V
LCD drive
voltage
voltage
V
DD
–
V
O
θ
= 0°
φ
= 0°
Ta = 0°C
—
25.8
—
V
Ta = 25°C
—
24.4
—
V
Ta = 50°C
—
22.4
—
V
Power cur-
rent
rent
I
DD
V
DD
= 5V, V
O
= –19.4
Frame frequency =
70Hz
70Hz
—
3.0
4.8
mA
LCD power
current
current
I
EE
—
2.6
4.2
mA
td
10%
tr
90%
1
00%
Drive
waveform
waveform
Non-select state
Light
receiving
section
output
receiving
section
output
select state
Non-select state
B
righ
tnes
s
Rising time
Falling time
B2
B1
B
rig
ht
ne
ss
Brightness curve of the
non-select segment
non-select segment
Brightness curve of the select segment
Drive voltage
(ø=180˚)
θ
2
(ø=270˚)
Y axis(ø=0˚)
(ø=90˚)
θ
1
Normal (
θ
=0˚)
Measurement position
Measurement point
ø
– 75 –
6. Interface pin connection (LCD)
(1) CN1
Pin No.
Symbol
Function
1
FRAME
Frame signal
2
LOAD
Display data latch signal
3
CP
Display data shift lock
4
DOFF
LCD display control signal
H:ON, L:OFF
H:ON, L:OFF
5
V
DD
Logic circuit power voltage
6
V
SS
Reference voltage (GND)
7
V
O
LCD drive voltage
8
D0
Display data
9
D1
Display data
10
D2
Display data
11
D3
Display data
12
DF (N.C)
LCD drive signal (AC signal)
13
V
EE
(N.C)
LCD drive voltage
14
F.G (N.C)
Frame GND
7. Block diagram
The timing of each signal conforms to the LC7940ID segment driver
and the LC7943D common driver.
and the LC7943D common driver.
8. Interface timing
Switching characteristics
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
CP Frequency
fcp
Duty = 50%
—
—
6.0
MHz
CP Pulse Width
tw1
—
56
—
—
ns
LOAD Pulse Width
tw2
—
70
—
—
ns
CP Rize/Fall Time
tr,tf
—
—
—
50
ns
DATA Set Up Time
tDSU
—
35
—
—
ns
DATA Hold Time
tDHD
—
35
—
—
ns
CP Set Up Time
tESUI
—
80
—
—
ns
LOAD
→
CP Time
tLC
—
80
—
—
ns
FRAME Set Up
Time
Time
tsetup
—
100
—
—
ns
FRAME Hold Time
thold
—
100
—
—
ns
Com1
Y driver1
Com200
Y driver3
Y driver2
FRAME
X driver1
X driver2
Seg1
Seg640
X driver8
LCD
640 x 200DOTS
DOFF
A.C
LOAD
C P
D0~D3
F.G
VSS
BIAS
VD D
VO
A.C: Divided frequency circuit
BIAS: Voltage divide circuit
ON: Logic power ON
→
LCD power ON
OFF: LCD powerOFF
→
Logic power OFF
Note: Power source
1,1
D3
D3
1,2
D2
1,3
D1
1,4
D0
1,5
D3
2,1
D3
D3
2,2
D2
2,3
D1
2,4
D0
2,5
D3
200,1
D3
200,2
D2
200,3
D1
200,4
D0
200,5
D3
1,640
D0
2,640
D0
200,640
D0
1dot
2dot
3dot
4dot
5dot
1dot
2dot
200dot
(DATA MAP)
640dot
1,(1~640)
200
160
200,637
1,1
1,5
1,637
2,1
1
1
2
160
3
1
2
LORD
CP
D3
200,638
1,2
1,6
1,638
2,2
D2
200,639
1,3
1,7
1,639
2,3
D1
200,640
1,4
1,8
1,640
2,4
D0
1,(1~640)
200,(1~640)
1,(1~640)
LORD
D0~D3
FRAME
199
200
1
2
200
2
1
1
CP
0.8VDD
0.8VDD
tw1
tw1
ft
ft
0.2VDD
0.2VDD
tDSU
tDHD
0.8VDD
0.8VDD
tw1
0.8VDD
0.2VDD
0.8VDD
0.2VDD
0.2VDD
0.8VDD
0.8VDD
tw2
0.2VDD
tLc
tESU1
tr
tr
0.8VDD
0.8VDD
0.2VDD
0.2VDD
tsetup
thold
D0~D3
LOAD
FRAME
– 76 –
9. CFL unit
(1) CFL specifications (Harrison Electric Col, Ltd.
φ
3, S type, length = 108mm)
Rated current
: 5mA
Discharge lamp
: 275 Vrms
Discharge start voltage : 550Vrms max. (at 0°C)
(2) CFL life
The life means when one of the following occurs.
1. The lamp wall brightness reaches 50 %.
2. When the lamp is not lighted normally.
The following table must be satisfied under the following conditions.
Ambient temperature
: Normal temperature (20
∼
35°C, no wind)
lamp current
: 5mA
Lighting condition
: Continuous lighting
Life
10000 hours or more
(3) Interface
Pin No.
Signal
Function
1
GND
GND line
2
N.C
—
3
HV
High voltage line
4
N.C
—
With connector: EHR-2 (Nihon Press Terminal)
10. Reliability test
Test item
Test condition
1. Leaving under
high temperature
60°C
200 hours
2. Leaving under low
temperature
–20°C
200 hours
3. Leaving under
high temperature
and high humidity
and high humidity
40°C 90%RH
200 hours
4. Heat shock
5 cycle
5.
Single unit
vibration
vibration
Vibration: 10
∼
55
∼
10 Hz
Amplitude: 1.5mm
Time:
Time:
each 15 min in X, Y, Z directions
6. Single unit shock
490m/s
2
or above
(each 5 times in X, Y, Z directions)
Note 1: Measurement must be performed after leaving the unit in a
room for 4 hours or more.
(Measurement reference)
1. Free from blurs.
2. Free from abnormal lighting.
3. Free from abnormal operations.
1. Free from blurs.
2. Free from abnormal lighting.
3. Free from abnormal operations.
11. Lot indication
1) Composition
The manufacturing lot No. is indicated with 4 digits.
1:
Year
2:
Month
3, 4:
Day
2) Codes
(1) Code for year
The value at the end of the year
Example: 1990
→
0, 1991
→
1
(2) Code for month
January
∼
September : Numeral figure corresponding to each month.
October
∼
December : The head character of each month name
Remark: October
→
C, November
→
N, December
→
D
(3) Code for day
1
∼
9:
"0" and the corresponding day number.
10
∼
31:
Corresponding day number.
Example: 5
→
05, 12
→
12, 30
→
30
(4) Display example
1992, March 12
→
2312
1993 November 3
→
3N03
3) Indication together with other codes
In principle, the manufacturing lot No. is indicated individually. If it
cannot help indicate it with other codes such as factory code, line
code, lot code, and change code, put a hyphen before these codes.
cannot help indicate it with other codes such as factory code, line
code, lot code, and change code, put a hyphen before these codes.
4) Display
The display should be easily visible in non-erasable method.
12. Note for handling
(1) The LCD elements are made of glass. BE careful not to give them
strong mechanical shock, or they may be broken. Use extreme
care not to break them.
care not to break them.
(2) If the LCD element is broken and the liquid is leaked, do not lick it.
If the liquid is attached to your skin or cloth, immediately clean with
soap.
soap.
(3) Use the unit under the rated conditions to prevent against dam-
age.
(4) Be careful not to drop water or other liquid on the display surface.
(5) The reflection plate and the polarizing plate are easily scratched.
BE careful not to touch them with a hard thing such as glass,
tweezers. Never hit, push, or rub the surface with hard things.
tweezers. Never hit, push, or rub the surface with hard things.
(6) When installing the unit, be careful not to apply stress to the LCD
module. If an excessive stress is applied, abnormal display or
uneven color may result.
uneven color may result.
25˚C [5]
60˚C [30]
-20˚C [30]
1
2
3
4
– 77 –
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