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參數(shù)資料
| 型號： | LH155L |
| 英文描述： | Industrial Control IC |
| 中文描述： | 工業(yè)控制IC |
| 文件頁數(shù)： | 21/51頁 |
| 文件大?。?/td> | 288K |
| 代理商： | LH155L |
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21
LH155BA
2.15. LCD Drive Circuit
This drive circuit generates 4 levels of LCD drive
voltage. The circuit has 128 segment outputs and
64 common outputs and outputs combined display
data and M signal. A common drive circuit that has
a shift register sequentially outputs common scan
signals.
2.16. Oscillation Circuit
The frequency of this CR oscillator is controlled by
the feedback resistor R
F
.
The output from this oscillator is used as the timing
signal source of the display and the boosting clock
to the booster circuit. This is valid only in the
master operation mode.
During the slave operation mode, maintain OSCI
pin at V
SS
and OSCO pin open (NC).
When in the master operation mode and if external
clock is used, maintain OSCI pin at V
SS
and OSCO
pin open (NC), and feed the clock to CK pin. The
duty cycle of the external clock must be 50%.
The CKS pin selects either internal oscillation circuit
or external clock.
2.17. Power Supply Circuit
This circuit supplies voltages necessary to drive an
LCD panel. This circuit is valid only in the master
operation mode. The circuit consists of booster
circuit and voltage converter.
Boosted voltage from the booster circuit is fed to the
voltage converter which converts this high input
voltage into V
0
, V
1
, V
2
, V
3
and V
4
which are used
for graphic display. This internal power supply
should not be used to drive a large LCD panel
containing many pixels or a large LCD panel that
has large capacity consisting of more than one chip.
Otherwise, display quality will degrade considerably.
Instead, use an external power supply.
This internal power supply is controlled by the
power supply circuit ON/OFF command (PON).
When the internal power supply is turned off, the
booster circuit and voltage converter are also
turned off.
When using the external power supply, turn off the
internal power supply, disconnect pins CAP+,
CAP–, V
EE2
, V
EE3
, V
OUT
, V
EE
, V
R1
and V
R2
, and
keep PMODE pin at V
SS
. Then, feed external LCD
drive voltages to pins V
0
, V
1
, V
2
, V
3
, and V
4
.
This circuit can be changed by the state of PMODE
pin.
NOTES :
1. Because the booster circuit and voltage converter are
not functioning, disconnect pins CAP+, CAP–, V
EE2
,
V
EE3
, V
OUT
, V
EE
, V
R1
and V
R2
.
Apply external LCD drive voltages to corresponding pins.
2. Because the booster circuit is not functioning, disconnect
pins CAP+, CAP–, V
EE2
, V
EE3
and V
EE
. Derive the
voltage source to be supplied to the voltage converter
from V
OUT
pin and then output LCD drive voltage to V
R1
and V
R2
pins. The voltage level at V
R1
and V
R2
pins
must be V
R2
≤ V
R1
≤ V
OUT
.
CKS
MASTER MODE
OSC
External
Clock (CK)
Disabled
Enabled
OSC
External
Clock (CK)
Disabled
Disabled
L
H
Enabled
Disabled
Disabled
Disabled
SLAVE MODE
PON
PMODE
BOOSTER
CIRCUIT
Disabled
Disabled
Enabled
Disabled
VOLTAGE
CONVERTER
Disabled
Enabled
Enabled
EXTERNAL
VOLTAGE INPUT
NOTE
V
0
, V
1
, V
2
, V
3
, V
4
V
0
, V
1
, V
2
, V
3
, V
4
–
V
OUT
, V
R1
, V
R2
0
0
1
1
0
1
0
1
1
1
2
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PDF描述 |
|---|---|
| LH1554P | LCD Display Driver |
| LH1554M | LCD Display Driver |
| LH1560F | 160 OUTPUT LCD SEGMENT / COMMON DRIVER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LH155N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC |
| LH155P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC |
| LH155R | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC |
| LH1560 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| LH1560F | 制造商:SHARP 制造商全稱:Sharp Electrionic Components 功能描述:160 OUTPUT LCD SEGMENT / COMMON DRIVER |
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