• Usable with both positive/negative power supplies
• Output mode selection
– Normal mode (1-pulse scanning)
– Continuous 2-pulse mode (2-pulse scanning)
– Jumping 2-pulse mode (2-pulse scanning)
• LCD drive voltage : +16.0 to +33.0 V
• Operating temperature : –30 to +85 ˚C
• Package : 258-pin TCP (Tape Carrier Package)
V
DD
V
EE
V
SS
V
CC
V
LS
TEST
1
TEST
2
CKV
SPV
CE
R/L
MODE
1
MODE
2
V
LS
V
CC
V
SS
V
EE
V
DD
258
257
256
255
254
253
252
251
250
249
248
247
246
245
244
243
242
241
1 OG
1
2 OG
2
3 OG
3
CHIP SURFACE
238 OG
238
239 OG
239
240 OG
240
NOTE :
Doesn't prescribe TCP outline.
In the absence of confirmation by device specification sheets, SHARP takes no responsibility for any defects that may occur in equipment using any SHARP devices shown in
catalogs, data books, etc. Contact SHARP in order to obtain the latest device specification sheets before using any SHARP device.
1
LH1691
PIN DESCRIPTION
PIN NO.
1 to 240
241, 258
242, 257
243, 256
244, 255
245, 254
246, 247
248
249
250
251
252, 253
SYMBOL
OG
1
-OG
240
V
DD
V
EE
V
SS
V
CC
V
LS
MODE
2
, MODE
1
R/L
CE
SPV
CKV
TEST
2
, TEST
1
I/O
O
–
–
–
–
–
I
I
I
I
I
I
DESCRIPTION
LCD drive output pins
Power supply pins for LCD drive
Power supply pins for LCD drive
Power supply pins for logic system
Power supply pins for logic system
Power supply pins for input level shifter
Output mode selection pins
Pin for selecting bi-directional shift register and setting cascade
sequence
Cascade sequence setting pin
Vertical scanning start pulse input pin
Vertical shift clock input pin
IC test pins
BLOCK DIAGRAM
MODE
2
246
MODE
1
247
R/L 248
CE 249
SPV 250
CKV 251
TEST
2
252
TEST
1
253
1
CONTROL
LOGIC
1
1
BI-DIRECTIONAL SHIFT
REGISTER
240
LEVEL SHIFTER
240
OUTPUT CIRCUIT
240
241 258 245 254 244 255 242 257 243 256
V
DD
V
DD
V
LS
V
LS
V
CC
V
CC
V
EE
V
EE
V
SS
V
SS
1
OG
1
240
OG
240
2
LH1691
FUNCTIONAL OPERATIONS OF EACH BLOCK
BLOCK
Control Logic
Bi-directional Shift
Register
Level Shifter
Output Circuit
FUNCTION
Used to create signals necessary for mode selecting signal, cascade sequence setting
signal and for operation of bi-directional shift register.
Used as transfer circuit of LCD drive output start signal. It is possible to set LCD drive
output sequence of OG
1
/
OG
240
direction or OG
240
/
OG
1
direction.
Used as circuit which shifts LCD drive output signals transferred by bi-directional shift
register to V
DD
-V
EE
level.
Configured with output buffers to output V
DD
-V
EE
level.
INPUT/OUTPUT CIRCUITS
V
LS
I
V
SS
,
To Internal Circuit
Level Shifter
Internal Logic
(V
LS
-0 V/V
CC
-V
SS
)
(V
CC
-V
SS
)
¿Applicable pins¡
CKV, SPV, CE, R/L,
MODE
1
, MODE
2
,
TEST
1
, TEST
2
Fig. 1 Input Circuit
V
DD
O
From Internal Circuit
(V
DD
-V
EE
)
V
EE
¿Applicable pins¡
OG
1
-OG
240
Fig. 2 Output Circuit
3
LH1691
FUNCTIONAL DESCRIPTION
Pin Functions
SYMBOL
V
DD
V
LS
V
CC
V
EE
V
SS
CKV
SPV
FUNCTION
Used as power supply pin for high level LCD drive.
Used as power supply pin for input level shifters.
Used as power supply pin for logic system, normally connected to V
SS
+ 5.0 V.
Used as power supply pin for low level LCD drive.
Used as logic system power supply pin.
Used as vertical shift clock pulse input pin.
Used as vertical scanning start pulse input pin. (At least, input one cycle of CKV during "L"
period of SPV.)
Used as input pins for selecting output mode.
Output mode is set as shown in the table below by setting MODE
1
pin and MODE
2
pin.
MODE
1
MODE
1
MODE
2
H
L
H
L
MODE
2
H
H
L
L
Output mode
Normal mode (1-pulse scanning)
Continuous 2-pulse mode
Jumping 2-pulse mode
Set all outputs to V
EE
level.
Used as input pin for selecting the shift direction of bi-directional shift register and for
setting the sequence of cascade connection.
R/L
LCD drive outputs shift from OG
1
to OG
240
when set to "H". LCD drive outputs shift from
OG
240
to OG
1
when set to "L". At the same time, cascade sequence is set as shown in
the table below.
Used as input pin for setting of chip cascade sequence. (Max. 2 cascades)
Cascade sequence
CE
R/L = "H"
R/L = "L"
H
L
1st
2nd
2nd
1st
CE
TEST
1
TEST
2
OG
1
-OG
240
With above setting, sets the cascade sequence signal inside the IC.
Used as input pins for IC testing.
Must be set to "H".
Used as output pins for LCD drive output, and which output data at 2 levels.
• Selecting data is output at V
DD
level .
• Non-selecting data is output at V
EE
level .
4
LH1691
Functional Operations
(1) Example of Cascade Sequence
OG
1
CE = "H"
OG
240
TFT-LCD Panel
OG
1
CE = "L"
OG
240
Scanning Direction When R/L = "L".
Scanning Direction When R/L = "H".
* At this time, normal mode (scanning with 1 pulse) is set when MODE
1
= "H" and MODE
2
= "H",
jumping 2-pulse mode (scanning with 2 pulses) is set when MODE
1
= "H" and MODE
2
= "L",
continuous 2-pulse mode (scanning with 2 pulses) is set when MODE
