SPLC100A1
40-CHANNEL SEG/COM LCD DRIVER
GENERAL DESCRIPTION
The SPLC100A1 is a Liquid Crystal Display driver that contains two sets of 20-bit bi-directional shift registers, 20
data latch flip-flops and 20 Liquid Crystal Display drivers. It also features 40-channel outputs that can be applied
as common or segment driver.
The SPLC100A1 receives serial display data from a display control LSI,
converts it into parallel data and supplies liquid crystal display waveforms to the liquid crystal.
FEATURES
Liquid Crystal Display driver with serial/parallel
BLOCK DIAGRAM
Y1
Y20
conversion function.
V1,V2
Serial transfer facilitates board design.
Capable of interfacing to liquid crystal display
controllers: HD43160AH, HD61830, HD44780,
HD44790, SPLC780
40 internal LCD drivers.
Internal serial/parallel conversion circuits:
—
20-bit
—
20-bit
V3,V4
LCD Drivers
Latch signal
CL1
DL1
CL2
DL2
FCS
M
V1,V2
V5,V6
Data
Shift signal
20-bit latch
20-bit bidirectional shift register
Switching circuit
20-bit bidirectional shift register
Data
20-bit latch
LCD Drivers
Shift
direction
Data
Data
Shift
direction
SHL1
DR1
DR2
SHL2
shift register
latch 2
2
Y21
Y40
Power supply:
—
—
Internal logic: 2.7V – 5.5V
Liquid crystal display driver circuit: 3.0V – 11.0V
CMOS process.
Sunplus Technology Co., Ltd.
1
Rev.: 1.0
1999.10.04
SPLC100A1
FUNCTION DESCRIPTION
SEGMENT DRIVER
When SPLC100A1 is used as a segment driver, FCS is connected to VSS. In this case, both channel 1 and
channel 2 shift data at the falling edge of CL2 and latch it at the falling edge of CL1. V3 and V5, V4 and V6 of
the liquid crystal display driver power supply are short-circuited, respectively.
7
(FLM)
M
CL1
Output of
latch
(Y
1
~ Y
40
)
Enlarged view
M
CL1
CL2
DL1/DR1
DL2/DR2
Latch
Shift
8
1
2
3
4
5
6
7
8
1
2
Segment data waveforms ( A type waveforms, 1/8 duty cycle )
Sunplus Technology Co., Ltd.
2
Rev.: 1.0
1999.10.04
SPLC100A1
COMMON DRIVER
In this case, channel 1 is used as a segment driver and channel 2 as common driver. When channel 2 of
SPLC100A1 is used as common driver, FCS is connected to VDD. In this case, channel 2 shifts data at the
rising edge of CL1 and latches it at the rising edge of CL2.
8
DL2/DR2(FLM)
1
Shift
2
3
4
5
6
7
8
1
2
CL1
Y21
(Y40)
Y22
(Y33)
to
Y28
(Y33)
Enlarged view
DL2/DR2(FLM)
M
Shift
CL1
Latch
CL2
Y21
(Y40)
Non-Select
Select
Select
Select
Non-Select
Non-Select
Select
Select
Select
Common data waveforms ( A type waveforms of channel 2, 1/8 duty cycle )
Sunplus Technology Co., Ltd.
3
Rev.: 1.0
1999.10.04
SPLC100A1
Both Channel 1 and Channel 2 Used as Common Drivers ( FCS = VDD )
Common Drivers ( FCS = VDD )
When both of channel 1 and channel 2 are used common drives, FCS is connected to VDD and the signals (CL1,
CL2, FLM) from the controller are connected as following.
In this case, connection of the Liquid Crystal Display driver power supply is different from that of segment driver,
V1,V2: Select level of segment and common
V3,V4: Non-select level of segment
V5,V6: Non-select level of common
VDD
SHL1
CL2
CL1
DL1
Common
DR1
driver
DL2
DR2
SPLC100A1
Y40 - 1
V1
V2
V3
V4
V5
V6
SPLC100A1
Segment
driver
V1
V2
V3
V4
V5
V6
Y40 - 1
SPLC100A1
Segment
driver
V1
V2
V3
V4
V5
V6
SHL2
FCS
Y40 - 1
LCD
Controller
Drive voltage of
liquid crystal
Sunplus Technology Co., Ltd.
display
V1
V2
V3
V4
V5
V6
4
Rev.: 1.0
1999.10.04
SPLC100A1
PIN DESCRIPTION
Mnemonic
VDD
VSS
VEE
Y6 – 1
Y20 – 7
Y27 – 21
Y40 – 28
V1, V2
V3, V4
V5, V6
SHL1
PIN No. Type
22
32
29
23-28
8-21
1-7
47-59
41,42
43,44
45,46
38
I
I
I
I
Power supply for liquid crystal display drive ( Select level )
Power supply for liquid crystal display drive (Non-select level for channel 1)
Power supply for liquid crystal display drive (Non-select level for channel 2)
Selection of the shift direction of channel 1 shift register
SHL1
DL1
DR1
VDD
Out
In
GND
In
Out
Selection of the shift direction of channel 2 shift register
SHL2
DL2
DR2
VDD
Out
In
GND
In
Out
Data Input / Output of channel 1 shift register
Data Input / Output of channel 2 shift register
Alternated signal for liquid crystal driver output
Latch signal for channel 1 (
) *1
O
Liquid crystal driver output ( Channel 2 )
I
I
I
O
Description
Positive power supply voltage input
Ground input
Power supply voltage for liquid crystal display drive
Liquid crystal driver output ( Channel 1 )
SHL2
39
I
DL1, DR1
DL2, DR2
M
CL1
33,34
35,36
37
30
I/O
I/O
I
I
Used for channel 2 when FCS is GND
CL2
31
I
Shift signal for channel 1 (
) *1
Used for channel 2 when FCS is GND
FCS
40
I
Mode select signal of channel 2. FCS signal exchanges the latch signal and
the shift of channel 2 and inverts M for channel 2.Thus, this signal exchanges
the function of channel 2.
FCS Level
Channel 2
Latch signal Shift signal
VDD
CL2
CL1
GND
CL1
CL2
*1
*1
Notes: *1.
and
M Polarity
M
M
Function
For common drive
For segment drive
*2
indicate the latches at rise and fall times, respectively.
*2. The output level relationship between channel 1 and channel 2 based on the FCS signal level as
follows:
Sunplus Technology Co., Ltd.
5
Rev.: 1.0
1999.10.04
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