DC CHARACTERISTICS ................................................................................................................................... 16
AC CHARACTERISTICS ................................................................................................................................... 18
RSDS DATA TIMING DIAGRAM.......................................................................................................................20
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S6C0666 PREMILINARY VER 1.06 BIT 384 CHANNEL RSDS TFT–LCD SOURCE DRIVER
INTRODUCTION
The S6C0666 is a Source Driver suitable for Reduced Swing Differential Signaling (RSDS) digital interface. It
converts 18-bit digital data into the analog voltage for 384 channels, charging each sub-pixel to the correct gray
level corresponding to the digital value.
The RSDS path to the panel timing controller contributes toward lowering radiated EMI, reducing system power
consumption and eliminates one of the two pixel busses used in typical XGA, SXGA TFT LCD panels. This single
9-bit differential bus conveys the 18-bit color data for XGA, SXGA panels.
FEATURES
• TFT active matrix LCD source driver LSI
•64 G/S is possible through 10 (5 by 2) external power supply and D/A converter
• Both dot inversion display and N-line inversion display are possible
• Compatible with gamma-correction
• Logic supply voltage: 2.7 to 3.6 V
• LCD driver supply voltage: 7.0 to 10.5 V
• Output dynamic range: 6.8 to 10.3 Vp-p
• Maximum operating frequency: fmax = 65 MHz (internal data transmission rate at 2.7 V operation)
• Output: 384 outputs
• Reduced Swing Differential Signaling (RSDS) digital interface for low power consumption and low EMI.
Total data lines consist of 18 data bus.
(6-bit digital, 3 colors (R, G, B) and 2 differential input pairs)
The 3 - bit differential input pairs generate the internal 6 - bit data
through the comparison between DxxP and DxxN.
This pin controls the direction of shift register in cascade connection.
When SHL = H: DIO1 input, Y1 → Y384, DIO2 output
When SHL = L: DIO2 input, Y384 → Y1, DIO1 output
SHL = H: Used as the start pulse input pin.
SHL = L: Used as the start pulse output pin.
SHL = H: Used as the start pulse output pin.
SHL = L: Used as the start pulse input pin.
DATPOL = L: No inversion
DATPOL = H: Data polarity inversion (H↔L)
POL = H: The reference voltage for odd number outputs are VGMA1 to
VGMA5 and those for even number outputs are VGMA6 to VGMA10.
POL = L: The reference voltage for odd number outputs are VGMA6 to
VGMA10 and those for even number outputs are VGMA1 to VGMA5.
The RSDS clock input pairs generate the internal shift clock, CLK2,
through the comparison between CLKP and CLKN.
S6C0666 clears 128 shift registers at the rising edge of CLK1 and
outputs the analog data to the each channel at the falling edge.
Input the gamma corrected power supplies from external source.
VDD2 > VGMA1 > VGMA2 > …… > VGMA9 > VGMA10 > VSS2
Keep power supplies unchanged during the gray-scale voltage output.
The Structure of the line-repair amp is the same as that of the analog
output. RPI1 (RPI2) → impedance changed → RPO1 (RPO2)
TEST = L: Normal operation mode
TEST = H: Test mode (OP AMP CUT-OFF, Rpd = 15 kΩ)
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S6C0666 PREMILINARY VER 1.06 BIT 384 CHANNEL RSDS TFT–LCD SOURCE DRIVER
OPERATION DESCRIPTION
RSDS RECEIVER AND DEMUX
The S6C0666 adapts the RSDS interface for EMI solution. The internal RSDS receiver block operates the
comparison between the transmitted differential input pair data. The input data lines from the timing controller
to the RSDS receiver consist of 6-bit digital, 3 colors, 1 port, 2 differential pairs (DxxP / DxxN).
The input common mode voltage range at the RSDS receiver is 1.2 V. The differential data and clock signals
from the panel timing controller arrive at the S6C0666 as multiplexed, even and odd data fields. (i.e., the data
is 2:1 multiplexed). The nominal peak to peak swing of this data is 200 mV across a termination resistor.
RSDS DATA BUS INTERFACE CONTROL
DATPOL controls the internal data inversion. When DATPOL = ”H”, the internal data is inverted. The inverted
data is the same that the RSDS receiver operates the comparison between the cross-transmitted differential
input pair data. Using the data inversion input pin, DATPOL, the RSDS data bus interface can be changed.
DISPLAY DATA TRANSFER
When DIO1 (or DIO2) pulse is loaded into the internal latch on the falling edge of CLKP, DIO1 (or DIO2) pulse
enables the operation of data transfer, so display data is valid on the 2nd falling edge of CLKP. Once all the
data of 384 channels is loaded into internal latch, it goes into stand-by state automatically, and any new data
is not accepted even though CLKP is provided until next DIO1 (or DIO2) input. When next DIO1 (or DIO2) is
provided, new display data is valid on the 2nd falling edge of CLKP after the rising edge of DIO1 (or DIO2).
EXTENSION OF OUTPUT
Output pin can be adjusted to an extended screen by cascade connection. When SHL = "L", Connect DIO1
pin of the previous stage to the DIO2 pin of the next stage and all the input pins except DIO1 and DIO2 are
connected together in each device. When SHL = "H", Connect DIO2 pin of the previous stage to the DIO1 pin
of the next stage and all the input pins except DIO2 and DIO1 are connected together in each device.
RELATIONSHIP BETWEEN INPUT DATA VALUE AND OUTPUT VOLTAGE
The LCD drive output voltages are determined by the input data and 10 (5 by 2) gamma corrected power
supplies (VGMA1 to VGMA10). Besides, to be able to deal with dot line inversion when mounted on a singleside, gradation voltages with different polarity can be output to the odd number output pins and the even
number output pins. Among 5 by 2 gamma corrected voltages, input gray scale voltages of the same polarity
with respect to the common voltage, for the respective 5 gamma corrected voltages of VGMA1 to VGMA5 and
VGMA6 to VGMA10.
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6 BIT 384 CHANNEL RSDS TFT–LCD SOURCE DRIVER PREMILINARY VER 1.0S6C0666
VDD2
VGMA1
VGMA2
VGMA3
VGMA4
VGMA5
VGMA6
VGMA7
VGMA8
VGMA9
VGMA10
VSS2
00H08H10H18H20H28H30H38H3FH
Figure 3. Gamma Correction Curve
VCOM
Input data
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S6C0666 PREMILINARY VER 1.06 BIT 384 CHANNEL RSDS TFT–LCD SOURCE DRIVER
If LSIs are stressed beyond those listed above “absolute maximum ratings”, they may be permanently
destroyed. These are stress ratings only, and functional operation of the device at these or any other
condition beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute maximum rated conditions for extended periods may affect device reliability.
Turn on power order: VDD1 → control signal input → VDD2 → VGMA1 to VGMA10
Turn off power order: VGMA1 to VGMA10 → VDD2 → control signal input → VDD1
RECOMMENDED OPERATION CONDITIONS
Table 4. Recommended Operation Conditions (Ta = - 20 to 70 °C, VSS1 = VSS2 = 0 V)
ParameterSymbolMin.Typ.Max.Unit
Logic supply voltageVDD12.73.03.6V
Driver supply voltageVDD27.0-10.5V
VGMA1 to VGMA50.5VDD2-VDD2 - 0.1V
Gamma corrected voltage
VGMA6 to VGMA10+ 0.1-0.5VDD2V
Driver part output voltageVyo+ 0.1-VDD2 - 0.1V
VDD1 = 2.7V--65
Maximum clock frequencyfmax
VDD1 = 3.0V--75
Output load capacitanceCL--150pF / PIN
MHz
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S6C0666 PREMILINARY VER 1.06 BIT 384 CHANNEL RSDS TFT–LCD SOURCE DRIVER
DC CHARACTERISTICS
Table 5 . DC Characteristics
(Ta = -20 to 75 °C, VDD1 = 2.7 to 3.6 V, VDD2 = 7.0 to 10.5 V, VSS1 = VSS2 = 0)
Output voltage deviationDVOInput data: 00H to 3FH-
Output swing voltage
difference deviation
dVrms
(3)
Vx
Vx
Vx
(1)
(1)
(1)
= 4.0 V, Vyo
= 4.0 V, Vyo
= 4.0 V, Vyo
VDD2 = 8.0 V,
(2)
VDD2 = 8.0 V,
(2)
VDD2 = 8.0 V,
(2)
= 1.0 V
= 7.0 V
= 1.0 V
0.40.8-
--2.0-1.0
1.02.0± 10± 20
Input data: 00H to 3FH-± 5± 15
Output voltage rangeVYOInput data: 00H to 3FHVSS2 + 0.1-VDD2 - 0.1V
Logic part dynamic
current
IDD1
VDD1 = 3.0 V
(4)
-6.08.0
VDD1 = 3.0 V,
VDD2 = 9.0 V,
Driver part dynamic
current
IDD2
VGMA1 = 8.5 V,
VGMA5 = 5.0 V,
-6.09.0
VGMA6 = 4.0 V,
VGMA10 = 0.5 V
(4) (5)
V
µA
V
mA
mV
mA
NOTES:
1. Vx is the voltage applied to analog output pins Y1 to Y384.
2. Vyo is the output voltage of analog output pins Y1 to Y384.
3. dVrms = max. deviation of (VHx-VLx)
VHx; the x gray level positive polarity driver output voltage
VLx; the x gray level negative polarity driver output voltage
4. CLK1 period = 20 µs at fCLKP = 33 MHz, data pattern = 1010……, (checkerboard pattern), Ta = 25 °C