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參數(shù)資料
| 型號： | S-4544A |
| 廠商： | Seiko Instruments Inc. |
| 英文描述： | LCD Controller-Driver With Built-in 8-Bit and Serial Interfaces(內(nèi)置8位和串行接口的LCD控制器-驅動器) |
| 中文描述： | LCD控制器與- 8內(nèi)置驅動器位和串行接口（內(nèi)置8位和串行接口的液晶顯示控制器-驅動器） |
| 文件頁數(shù)： | 14/39頁 |
| 文件大小： | 237K |
| 代理商： | S-4544A |
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LCD Controller-Driver
S-4544A
Seiko Instruments Inc.
13
Table 12
FNC1
FNC2
Doubler/
Tripler
Voltage
Regulator
Voltage Follower/
LCD Bias Resistor
Notes
L
L
H
H
L
H
L
H
Valid
Invalid
Invalid
Invalid
Valid
Invalid
Valid
Invalid
Valid
Invalid
Valid
Valid
Use all of internal LCD power
supply circuits.
Use external bias resistors.
Use the external power supply
circuit.
Externally create and input V5
voltage.
Notes:
Always connect FNC1 and 2 to VDD or VSS.
Externally-connected pins VOUT and V1 through V5 are not used as a drive power supply of other circuit.
Externally connecting the power supply, with the built-in LCD power supply circuit ON may lead to a
breakdown.
16.1
Doubler/Tripler
The voltage is boosted below VDD on a VDD basis and output to the VOUT.
To boost the voltage 3 times, connect a specified capacitor between C1+ and C1-, C2+ and C2-, and VSS and
VOUT. Use the booster in the range of VSS=-2.4 to -3.6V.
To boost the voltage twice, connect a capacitor between C1+ and C1- as well as between VSS and VOUT, and
connect C2- to VOUT. Turn C2+ to
“
Open.
”
Use the booster in the range of VSS=-2.4 to -5.5V.
16.2
LCD Voltage Adjustment
There are two methods of adjusting the LCD voltage as follows:
16.2.1 Voltage Regulator
Voltage regulator output V5 is adjusted by externally-attached Ra and Rb.
V5 can be calculated as a resistor division ratior of built-in reference voltage VREF. The VREF with a temperature
characteristics from approximately - 0.13%/
°
C to +0.01%/
°
C can compensate the LCD temperature characteristics.
The value of the VREF differs depending upon the temperature compensation coefficient of the reference voltage for
which the command is selected.
When a volume resistance is used in the resistor, V5 can be set variably. Feedback voltage noises occurring at the
V
CNT
pin directly affects on V5. Take appropriate measures against noises.
VDD=0V
(VCC=3V)
VSS=-3V
(GND=0V)
Double VOUT=-6V
Triple VOUT=-9V
Figure Example of Booster Output
Ra+Rb
V5=
VREF (V)
Ra
VREF
VDD
Ra
Rb
VCNT
V5
+
-
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