Sharp LH1694 Datasheet
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1
DESCRIPTION
The LH1694 is a 256-output TFT-LCD gate driver
IC.
FEATURES
• Number of LCD drive outputs : 256
• LCD drive output sequence :
Output shift direction can be selected
OG
1/OG256 or OG256/OG1
• Enable chain connection
• Usable with both positive/negative power supplies
• Output signal masking function
• Input signal voltage : +2.7 to +3.6 V
• LCD drive voltage : +16.0 to +42.0 V
• Operating temperature : –30 to +85 ˚C
• Package : 277-pin TCP (Tape Carrier Package)
PIN CONNECTIONS
LH1694
LH1694
256-output TFT-LCD Gate Driver IC
OG254
OG255
OG256
254
255
256
OG
1
OG2
OG3
1
2
3
CHIP SURFACE
VDD
VEE
VSS
VCC
VLS
GND
SVIO
R/L
CKV
OE1
OE2
OE3
SVOI
GND
TEST2
TEST1
VLS
VCC
VSS
VEE
VDD
277
276
275
274
273
272
271
270
269
268
267
266
265
264
263
262
261
260
259
258
257
277-PIN TCP
TOP VIEW
NOTE :
Doesn't prescribe TCP outline.
2
LH1694
PIN DESCRIPTION
BLOCK DIAGRAM
PIN NO. SYMBOL I/O DESCRIPTION
1 to 256 OG
1-OG256 O LCD drive output pins
257, 277 V
DD – Power supply pins for LCD drive
258, 276 VEE – Power supply pins for LCD drive
259, 275 V
SS – Power supply pins for logic system
260, 274 VCC – Power supply pins for logic system
261, 273 V
LS – Power supply pins for logic input/output systems
265 SVOI I/O Vertical scanning start pulse input/output pin
266 to 268 OE
3-OE1 I Input pins for output enable
269 CKV I Vertical shift clock input pin
270 R/L I Pin for selecting bi-directional shift register and setting cascade sequence
257
V
DD
262
263
TEST
1
TEST2
SVOI
OE
3
OE2
OE1
CKV
R/L
SVIO
265
266
267
268
269
270
271
V
DD
277 261
V
LS VLS
273 264
GND GND
272 260
V
CC VCC
274 258
V
EE VEE
276 259
V
SS VSS
275
OG
1
1
OG
256
256
OUTPUT CIRCUIT
LEVEL SHIFTER
BI-DIRECTIONAL SHIFT
REGISTER
CONTROL
LOGIC
1 256
1 256
1 256
IC test pinsITEST1, TEST2262, 263
Ground pins for logic input–GND264, 272
Vertical scanning start pulse input/output pinI/OSVIO271
3
LH1694
FUNCTIONAL OPERATIONS OF EACH BLOCK
BLOCK FUNCTION
Control Logic
Used to create signals necessary for mode selecting signal, cascade sequence setting
signal and for operation of bi-directional shift register.
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/OG256 direction or OG256/OG1 direction.
Level Shifter
Used as circuit which shifts LCD drive output signals transferred by bi-directional shift
register to V
DD-VEE level.
Output Circuit Configured with output buffers to output VDD-VEE level.
INPUT/OUTPUT CIRCUITS
I
V
LS
Level Shifter
(V
LS-GND/VCC-VSS)
Internal Logic
(VCC-VSS)
V
SS
To Internal Circuit
Fig. 1 Input Circuit
¿Applicable pins¡
CKV, R/L, OE
1-OE3,
TEST
1, TEST2
VLS
VSS
(VLS-GND)
Output Signal
Output Control Signal
VLS
Level Shifter
(V
LS-GND/VCC-VSS)
V
SS
To Internal Circuit
I
O
Fig. 2 Input/Output Circuit
¿Applicable pins¡
SVIO, SVOI
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