Renesas EL5226IR 10- and 12-channel tft-lcd reference voltage generator Datasheet

DATASHEET
EL5226, EL5326
FN7118
Rev 3.00
May 9, 2005
10- and 12-Channel TFT-LCD Reference Voltage Generators
The EL5226 and EL5326 are designed to produce the
reference voltages required in TFT-LCD applications. Each
output is programmed to the required voltage with 10 bits of
resolution. Reference pins determine the high and low
voltages of the output range, which are capable of swinging
to either supply rail. Programming of each output is
performed using the I2C serial interface.
Features
A number of the EL5226 and EL5326 can be stacked for
applications requiring more than 12 outputs. The reference
inputs can be tied to the rails, enabling each part to output
the full voltage range, or alternatively, they can be connected
to external resistors to split the output range and enable finer
resolutions of the outputs.
• Low supply current of 10mA
The EL5226 has 10 outputs and the EL5326 has 12 outputs
and both are available in a 28-pin TSSOP package. They
are specified for operation over the full -40°C to +85°C
temperature range.
• 10- to 12-channel reference outputs
• Accuracy of ±1%
• Supply voltage of 5V to 16.5V
• Digital supply 3.3V to 5V
• Rail-to-rail capability
• Pb-Free available (RoHS compliant)
Applications
• TFT-LCD drive circuits
• Reference voltage generators
Ordering Information
PART
NUMBER
PACKAGE
TAPE & REEL PKG. DWG. #
EL5226IR
28-Pin TSSOP
-
MDP0044
EL5226IR-T7
28-Pin TSSOP
7”
MDP0044
EL5226IR-T13
28-Pin TSSOP
13”
MDP0044
EL5226IRZ
(See Note)
28-Pin TSSOP
(Pb-free)
-
MDP0044
EL5226IRZ-T7
(See Note)
28-Pin TSSOP
(Pb-free)
7”
MDP0044
EL5226IRZ-T13
(See Note)
28-Pin TSSOP
(Pb-free)
13”
MDP0044
EL5326IR
28-Pin TSSOP
-
MDP0044
EL5326IR-T7
28-Pin TSSOP
7”
MDP0044
EL5326IR-T13
28-Pin TSSOP
13”
MDP0044
EL5326IRZ
(See Note)
28-Pin TSSOP
(Pb-free)
-
MDP0044
EL5326IRZ-T7
(See Note)
28-Pin TSSOP
(Pb-free)
7”
MDP0044
EL5326IRZ-T13
(See Note)
28-Pin TSSOP
(Pb-free)
13”
MDP0044
NOTE: Intersil Pb-free products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with
both SnPb and Pb-free soldering operations. Intersil Pb-free products
are MSL classified at Pb-free peak reflow temperatures that meet or
exceed the Pb-free requirements of IPC/JEDEC J STD-020.
FN7118 Rev 3.00
May 9, 2005
Page 1 of 12
EL5226, EL5326
Pinouts
EL5226
(28-PIN TSSOP)
TOP VIEW
EL5326
(28-PIN TSSOP)
TOP VIEW
STD_REG 1
28 OUTA
27 OUTA
SCL 2
27 OUTB
SDA 3
26 OUTB
SDA 3
26 OUTC
OSC 4
25 OUTC
OSC 4
25 GND
STD_REG 1
SCL 2
OSC_SELECT 5
28 NC
24 GND
OSC_SELECT 5
24 OUTD
VS 6
23 OUTD
VS 6
23 OUTE
NC 7
22 OUTE
NC 7
22 OUTF
VSD 8
21 OUTF
VSD 8
21 OUTG
REFH 9
20 OUTG
REFH 9
20 OUTH
REFL 10
19 GND
REFL 10
19 OUTI
VS 11
18 GND
VS 11
18 OUTH
GND 12
17 OUTI
GND 12
17 OUTJ
CAP 13
16 OUTJ
CAP 13
16 OUTK
A0 14
15 OUTL
DEV_ADDRO 14
FN7118 Rev 3.00
May 9, 2005
15 NC
Page 2 of 12
EL5226, EL5326
Absolute Maximum Ratings (TA = 25°C)
Supply Voltage between VS and GND. . . . . . . . . . . . . . . . . . . .+18V
Supply Voltage between VSD and GND . . . . . . . VS and +7V (max)
Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . 30mA
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
Maximum Die Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . +125°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Ambient Operating Temperature . . . . . . . . . . . . . . . .-40°C to +85°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are
at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Electrical Specifications
PARAMETER
VS = 15V, VSD = 5V, VREFH = 13V, VREFL = 2V, RL = 1.5k and CL = 200pF to 0V, TA = 25°C, unless
otherwise specified.
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
EL5226
9
11
mA
EL5326
10
12
mA
0.9
3.2
mA
50
150
mV
SUPPLY
IS
ISD
Supply Current
Digital Supply Current
ANALOG
VOL
Output Swing Low
Sinking 5mA (VREFH = 15V, VREFL = 0)
VOH
Output Swing High
Sourcing 5mA (VREFH = 15V, VREFL = 0)
ISC
Short Circuit Current
PSRR
Power Supply Rejection Ratio
tD
14.85
14.95
V
RL = 10
150
240
mA
VS+ is moved from 14V to 16V
45
65
dB
Program to Out Delay
4
ms
VAC
Accuracy
20
mV
VDROOP
Droop Voltage
1
RINH
Input Resistance @ VREFH, VREFL
34
REG
Load Regulation
IOUT = 5mA step
0.5
2
mV/ms
k
1.5
mV/mA
DIGITAL
VIH
Logic 1 Input Voltage
VIL
Logic 0 Input Voltage
FCLK
Clock Frequency
FN7118 Rev 3.00
May 9, 2005
VSD20%
V
20%*
VSD
V
400
kHz
Page 3 of 12
EL5226, EL5326
Pin Descriptions
EL5226
EL5326
PIN NAME
PIN TYPE
1
1
STD_REG
Logic Input
Selects mode, high = standard, low = register mode
2
2
SCL
Logic Input
I2C clock
3
3
SDA
Logic Input
I2C data
4
4
OSC
Input/Output
Oscillator pin for synchronizing multiple chips
5
5
OSC_SELECT
Logic Input
Selects internal / external OSC source, high = external,
low = internal
6, 11
6, 11
VS
Analog Power
7, 15, 28
7
NC
8
8
VSD
9
9
REFH
Analog Reference Input High reference voltage
10
10
REFL
Analog Reference Input Low reference voltage
12, 19, 24
12, 18, 25
GND
Ground
13
13
CAP
Analog Bypass Pin
14
14
DEV_ADDR0
Logic Input
16
17
OUTJ
Analog Output
Channel J programmable output
17
19
OUTI
Analog Output
Channel I programmable output
18
20
OUTH
Analog Output
Channel H programmable output
20
21
OUTG
Analog Output
Channel G programmable output
21
22
OUTF
Analog Output
Channel F programmable output
22
23
OUTE
Analog Output
Channel E programmable output
23
24
OUTD
Analog Output
Channel D programmable output
25
26
OUTC
Analog Output
Channel C programmable output
26
27
OUTB
Analog Output
Channel B programmable output
27
28
OUTA
Analog Output
Channel A programmable output
15
OUTL
Analog Output
Channel L programmable output
16
OUTK
Analog Output
Channel K programmable output
FN7118 Rev 3.00
May 9, 2005
PIN FUNTION
Power supply for analog circuit
not connected
Digital Power
Power supply for digital circuit
Ground
Decoupling capacitor for internal reference generator
I2C device address input, bit 0
Page 4 of 12
EL5226, EL5326
Typical Performance Curves
VS=VREFH=15V
VREFL=0V
0.3
1.2
0.2
1.0
0.1
0.8
ISD (mA)
DIFFERENTIAL NONLINEARITY (LSB)
VS=15V, VSD=5V, VREFH=13V, VREFL=2V
0
0.6
-0.1
0.4
-0.2
0.2
-0.3
10
210
410
610
810
1010
0
3
3.2
3.4
3.5
3.8
4.2
4
4.4
4.5
4.8
5
VSD (V)
INPUT CODE
FIGURE 1. DIFFERENTIAL NONLINEARITY vs CODE
FIGURE 2. DIGITAL SUPPLY VOLTAGE vs DIGITAL SUPPLY
CURRENT
VS=VREFH=15V
M=400ns/DIV
VS=VREFH=15V
M=400ns/DIV
0mA
5mA/DIV
5mA
0mA
5mA
CL=1nF
RS=20
CL=4.7nF
RS=20
5V
200mV/DIV
CL=1nF
RS=20
CL=4.7nF
RS=20
CL=180pF
CL=180pF
FIGURE 3. TRANSIENT LOAD REGULATION (SOURCING)
M=400µs/DIV
5V
FIGURE 4. TRANSIENT LOAD REGULATION (SINKING)
M=400µs/DIV
SCLK
SCLK
SDA
SDA
0V
5V
0V
10V
5V
0V
OUTPUT
FIGURE 5. LARGE SIGNAL RESPONSE (RISING FROM 0V
TO 8V)
FN7118 Rev 3.00
May 9, 2005
OUTPUT
FIGURE 6. LARGE SIGNAL RESPONSE (FALLING FROM 8V
TO 0V)
Page 5 of 12
EL5226, EL5326
Typical Performance Curves (Continued)
M=400µs/DIV
M=400µs/DIV
SCLK
SCLK
5V
0V
SDA
SDA
5V
0V
OUTPUT
OUTPUT
200mV
0V
FIGURE 7. SMALL SIGNAL RESPONSE (RISING FROM 0V
TO 200mV)
FIGURE 8. SMALL SIGNAL RESPONSE (FALLING FROM
200mV TO 0V)
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD
JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD
0.9
1.4
833mW
1.333W
1.2
0.7

0.6
JA
0.5
POWER DISSIPATION (W)
POWER DISSIPATION (W)
0.8
TS
SO
P2
8
20
°C
/W
=1
0.4
0.3
0.2
1

JA
=
0.8
TS
SO
P2
8
75
°C
/W
0.6
0.4
0.2
0.1
0
0
25
50
75
85
100
AMBIENT TEMPERATURE (°C)
FIGURE 9. POWER DISSIPATION vs AMBIENT
TEMPERATURE
FN7118 Rev 3.00
May 9, 2005
125
0
0
25
50
75 85
100
125
AMBIENT TEMPERATURE (°C)
FIGURE 10. POWER DISSIPATION vs AMBIENT
TEMPERATURE
Page 6 of 12
EL5226, EL5326
General Description
The EL5226 and EL5326 provide a versatile method of
providing the reference voltages that are used in setting the
transfer characteristics of LCD display panels. The V/T
(Voltage/Transmission) curve of the LCD panel requires that a
correction is applied to make it linear; however, if the panel is
to be used in more than one application, the final curve may
differ for different applications. By using the EL5226 and
EL5326, the V/T curve can be changed to optimize its
characteristics according to the required application of the
display product. Each of the eight reference voltage outputs
can be set with a 10-bit resolution. These outputs can be
driven to within 50mV of the power rails of the EL5226 and
EL5326. As all of the output buffers are identical, it is also
possible to use the EL5226 and EL5326 for applications other
than LCDs where multiple voltage references are required that
can be set to 10 bit accuracy.
Digital Interface
The EL5226 and EL5326 use a simple two-wire I2C digital
interface to program the outputs. The bus line SCLK is the
clock signal line and bus SDA is the data information signal
line. The EL5226 and EL5326 can support the clock rate up to
400kHz. External pull up resistor is required for each bus line.
The typical value for these two pull up resistor is about 1k.
START AND STOP CONDITION
The Start condition is a high to low transition on the SDA line
while SCLK is high. The Stop condition is a low to high
transition on the SDA line while SCLK is high. The start and
stop conditions are always generated by the master. The bus is
considered to be busy after the start condition and to be free
again a certain time after the stop condition. The two bus lines
must be high when the buses are not in use. The I2C Timing
Diagram 2 shows the format.
DATA VALIDITY
are allowed for the EL5226 and EL5326. The first 6 bits (A6 to
A1, MSBs) of the device address have been factory
programmed and are always 111010. Only the least significant
bit A0 is allowed to change the logic state, which can be tied to
VSD or DGND. A maximum of two EL5226 and EL5326 may
be used on the same bus at one time. The EL5226 and
EL5326 monitor the bus continuously and waiting for the start
condition followed by the device address. When a device
recognizes its device address, it will start to accept data. An
eighth bit is followed by the device address, which is a data
direction bit (W/R). A "0" indicates a Write transmission and a
"1" indicates a Read transmission.
The EL5226 and EL5326 can be operated as Standard mode
and Register mode. See the I2C Timing Diagram 1 for detail
formats.
STANDARD MODE
The part operates at Standard Mode if pin 1 (STD/REG) is held
high. The Standard Mode allows the user to program all
outputs at one time. Two data bytes are required for 10-bit data
for each channel output and there are a total of 20/24 data
bytes for 10/12 channels. Data in data byte 1 and 2 is for
channel A. Data in data byte 15 and 16 is for channel H. D9 to
D0 are the 10-bit data for each channel. The unused bits in the
data byte are "don't care" and can be set to either one or zero.
See Table 1 for program sample for one channel setting:
TABLE 1.
DATA
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
CONDITION
0
0
0
0
0
0
0
0
0
0
Data value = 0
1
0
0
0
0
0
0
0
0
0
Data value = 512
0
0
0
0
0
1
1
1
1
1
Data value = 31
1
1
1
1
1
1
1
1
1
1
Data value = 1023
The data on the SDA line must be stable during the high period
of the clock. The high or low state of the data line can only
change when the clock signal on the SCLK line is low.
When the W/R bit is high, the master can read the data from
the EL5226 and EL5326. See Timing Diagram 1 for detail
formats.
BYTE FORMAT AND ACKNOWLEDGE
REGISTER MODE
Every byte put on the SDA line must be eight bits long. The
number of bytes that can be transmitted per transfer is
unrestricted. Each byte has to be followed by an acknowledge
bit. Data is transferred with the most significant bit first (MSB).
The part operates at Register Mode if pin 1 (STD/REG) is held
low. The Register Mode allows the user to program each
output individually. Followed by the first byte, the second byte
sets the register address for the programmed output channel.
Bits R0 to R3 set the output channel address. For the unused
bits in the R4 to R7 are "don't care". See Table 2 for program
sample.
The master puts a resistive high level on the SDA line during
the acknowledge clock pulse. The peripheral that
acknowledges has to pull down the SDA line during the
acknowledge clock pulse.
DEVICES ADDRESS AND W/R BIT
Data transfers follow the format shown in Timing Diagram 1.
After the Start condition, a first byte is sent which contains the
Device Address and write/read bit. This address is a 7- bit long
device address and only two device addresses (74H and 75H)
FN7118 Rev 3.00
May 9, 2005
The EL5226 and EL5326 also allows the user to read the data
at Register Mode. See Timing Diagram 1 for detail formats.
I2C Timing Diagram 1
Page 7 of 12
I2C
Data
Start
I2C
Data In
Device Address
W
A
A6 A5 A4 A3 A2 A1 A0
I2C
CLK In
1
2
3
4
5
6
7
= don’t care
Data 1
A
D7 D6 D5 D4 D3 D2 D9 D8
8
1
2
3
4
5
6
7
Data 2
A
D7 D6 D5 D4 D3 D2 D1 D0
8
1
2
3
4
5
6
7
Data 3
Data 16
D7 D6 D5
A
Stop
D2 D1 D0
8
6
7
8
STANDARD MODE (STD/REG = HIGH) READ MODE
I2C
Data
Start
I2C
Data In
Device Address
R
A
Data 1
A
Data 2
A
Data 3
Data 16
NA
Stop
A6 A5 A4 A3 A2 A1 A0
I2C
Data Out
D7 D6 D5 D4 D3 D2 D9 D8
I2C
CLK In
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
D7 D6 D5 D4 D3 D2 D1 D0
8
1
2
3
4
5
6
7
D7 D6 D5
D2 D1 D0
8
6
7
8
REGISTER MODE (STD/REG = LOW) WRITE MODE
I2C
Data
Start
I2C
Data In
Device Address
W
A
A6 A5 A4 A3 A2 A1 A0
I2C
CLK In
1
2
3
4
5
6
7
Register Address
A
D7 D6 D5 D4 R3 R2 R1 R0
8
1
2
3
4
5
6
7
Data 1
A
D7 D6 D5 D4 D3 D2 D9 D8
8
1
2
3
4
5
6
7
Data 2
A
Stop
D7 D6 D5 D4 D3 D2 D1 D0
8
1
2
Device Address
R
A
3
4
5
6
7
8
REGISTER MODE (STD/REG = LOW) READ MODE
I2C
Data
I2C
Data In
Start
Device Address
W
A6 A5 A4 A3 A2 A1 A0
A
Register Address
A
D7 D6 D5 D4 R3 R2 R1 R0
Start
Data 1
A
Data 2
NA
A6 A5 A4 A3 A2 A1 A0
I2C
Data Out
Page 8 of 12
D7 D6 D5 D4 D3 D2 D9 D8
I2C
CLK In
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
D7 D6 D5 D4 D3 D2 D1 D0
1
2
3
4
5
6
7
8
Stop
EL5226, EL5326
FN7118 Rev 3.00
May 9, 2005
STANDARD MODE (STD/REG = HIGH) WRITE MODE
EL5226, EL5326
REGISTER ADDRESS
DATA
R3
R2
R1
R0
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Channel A, Value = 0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
Channel B, Value = 512
0
0
1
0
0
0
0
0
0
1
1
1
1
1
Channel C, Value = 31
0
1
1
1
1
1
1
1
1
1
1
1
1
1
Channel H, Value = 1023
I2C Timing Diagram 2
START
CONDITION
tF
tR
STOP CONDITION
DATA
CLOCK
tS
tH
tS
tH
tR
tF
FIGURE 11. START, STOP & TIMING DETAILS OF I2C
INTERFACE
Analog Section
TRANSFER FUNCTION
The transfer function is:
data
V OUT  IDEAL  = V REFL + -------------   V REFH - V REFL 
1024
where data is the decimal value of the 10-bit data binary input
code.
CONDITION
rising edges of the OSC clock. The driving load shouldn’t be
changed at the rising edges of the OSC clock. Otherwise, it will
generate a voltage error at the outputs. This clock may be input or
output via the clock pin labeled OSC. The internal clock is
provided by an internal oscillator running at approximately 21kHz
and can be output to the OSC pin. In a 2 chip system, if the driving
loads are stable, one chip may be programmed to use the internal
oscillator; then the OSC pin will output the clock from the internal
oscillator. The second chip may have the OSC pin connected to
this clock source.
For transient load application, the external clock Mode should
be used to ensure all functions are synchronized together. The
positive edge of the external clock to the OSC pin should be
timed to avoid the transient load effect. The Application
Drawing shows the LCD H rate signal used, here the positive
clock edge is timed to avoid the transient load of the column
driver circuits.
After power on, the chip will start with the internal oscillator
mode. At this time, the OSC pin will be in a high impedance
condition to prevent contention. By setting pin 32 to high, the
chip is on external clock mode. Setting pin 32 to low, the chip is
on internal clock mode.
The output voltages from the EL5226 and EL5326 will be
derived from the reference voltages present at the VREFL and
VREFH pins. The impedance between those two pins is about
32k.
Care should be taken that the system design holds these two
reference voltages within the limits of the power rails of the
EL5226 and EL5326. GND < VREFH  VS and GND  VREFL 
VREFH.
In some LCD applications that require more than 12 channels,
the system can be designed such that one EL5226 or EL5326
will provide the Gamma correction voltages that are more
positive than the VCOM potential. The second EL5226 or
EL5326 can provide the Gamma correction voltage more
negative than the VCOM potential. The Application Drawing
shows a system connected in this way.
CLOCK OSCILLATOR
The EL5226 and EL5326 require an internal clock or external
clock to refresh its outputs. The outputs are refreshed at the falling
OSC clock edges. The output refreshed switches open at the
FN7118 Rev 3.00
May 9, 2005
Page 9 of 12
EL5226, EL5326
Block Diagram
REFERENCE HIGH
OUTA
OUTB
OUTJ
EIGHT
CHANNEL
MEMORY
VOLTAGE
SOURCES
OUTK
OUTL
REFERENCE LOW
REFERENCE DECOUPLE
I2C DATA IN
CONTROL IF
I2C CLOCK IN
FILTER
STD/REG
A0
OSCILLATOR
SELECT
OSCILLATOR
INPUT/OUTPUT
CHANNEL OUTPUTS
POWER DISSIPATION
Each of the channel outputs has a rail-to-rail buffer. This
enables all channels to have the capability to drive to within
50mV of the power rails, (see Electrical Characteristics for
details).
With the 30mA maximum continues output drive capability for
each channel, it is possible to exceed the 125°C absolute
maximum junction temperature. Therefore, it is important to
calculate the maximum junction temperature for the application
to determine if load conditions need to be modified for the part
to remain in the safe operation.
When driving large capacitive loads, a series resistor should be
placed in series with the output. (Usually between 5 and
50).
Each of the channels is updated on a continuous cycle, the
time for the new data to appear at a specific output will depend
on the exact timing relationship of the incoming data to this
cycle.
The best-case scenario is when the data has just been
captured and then passed on to the output stage immediately;
this can be as short as 48µs. In the worst-case scenario this
will be 480µs for EL5226 and 576µs for EL5236, when the data
has just missed the cycle.
When a large change in output voltage is required, the change
will occur in 2V steps, thus the requisite number of timing
cycles will be added to the overall update time. This means
that a large change of 16V can take between 4.8ms and 5.3ms
for EL5226 and between 6.9ms to 7.48ms for EL5236
depending on the absolute timing relative to the update cycle.
FN7118 Rev 3.00
May 9, 2005
The maximum power dissipation allowed in a package is
determined according to:
T JMAX - T AMAX
P DMAX = -------------------------------------------- JA
where:
• TJMAX = Maximum junction temperature
• TAMAX = Maximum ambient temperature
• JA = Thermal resistance of the package
• PDMAX = Maximum power dissipation in the package
Page 10 of 12
EL5226, EL5326
The maximum power dissipation actually produced by the IC is
the total quiescent supply current times the total power supply
voltage and plus the power in the IC due to the loads.
P DMAX = V S  I S +    V S - V OUT i   I LOAD i 
when sourcing, and:
P DMAX = V S  I S +   V OUT i  I LOAD i 
when sinking.
Where:
• i = 1 to total 12
• VS = Supply voltage
• IS = Quiescent current
• VOUTi = Output voltage of the i channel
• ILOADi = Load current of the i channel
By setting the two PDMAX equations equal to each other, we
can solve for the RLOAD's to avoid the device overheat. The
package power dissipation curves provide a convenient way to
see if the device will overheat.
POWER SUPPLY BYPASSING AND PRINTED CIRCUIT
BOARD LAYOUT
Good printed circuit board layout is necessary for optimum
performance. A low impedance and clean analog ground plane
should be used for the EL5226 and EL5326. The traces from
the two ground pins to the ground plane must be very short.
The thermal pad of the EL5226 and EL5326 should be
connected to the analog ground plane. Lead length should be
as short as possible and all power supply pins must be well
bypassed. A 0.1µF ceramic capacitor must be place very close
to the VS, VREFH, VREFL, and CAP pins. A 4.7µF local bypass
tantalum capacitor should be placed to the VS, VREFH, and
VREFL pins.
APPLICATION USING THE EL5226 AND EL5326
In the first application drawing, the schematic shows the
interconnect of a pair of EL5226 and EL5326 chips connected
to give 8 gamma corrected voltages above the VCOM voltage,
and 8 gamma corrected voltages below the VCOM voltage.
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FN7118 Rev 3.00
May 9, 2005
Page 11 of 12
EL5226, EL5326
Application Drawing
HIGH REFERENCE
VOLTAGE
+10V
REFH
OUTA
VS
OUTB
COLUMN (SOURCE)
DRIVER
0.1µF
+12V
0.1µF
+5V
MICROCONTROLLER
VSD
OUTC
LCD PANEL
0.1µF
OUTD
AO
I2C DATA IN
SDA
OUTE
I2C CLOCK
LCD
TIMING
CONTROLLER
ADDRESS = H74
SCL
HORIZONTAL RATE
OSC
+5V
OSC_SEL
OUTF
CAP
0.1µF
OUTK
REFL
STD
GND
OUTL
EL5226,EL5326
MIDDLE REFERENCE VOLTAGE
+5.5V
REFH
OUTA
OSC
+5V
OSC_SEL
+12V
VS
OUTB
0.1µF
+5V
VSD
OUTC
0.1µF
AO
I2C DATA IN
OUTD
SDA
I2C CLOCK
SCL
OUTE
ADDRESS = H75
CAP
0.1µF
+1V
LOW REFERENCE
VOLTAGE
OUTF
REFL
0.1µF
OUTK
STD
GND
OUTL
EL5226,EL5326
FN7118 Rev 3.00
May 9, 2005
Page 12 of 12
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