參數(shù)資料
型號(hào)： SED122ADXA
元件分類(lèi)： 顯示控制器
英文描述： 16 X 60 DOTS DOT MAT LCD DRVR AND DSPL CTLR, UUC165
封裝： DIE-165
文件頁(yè)數(shù)： 8/50頁(yè)
文件大小： 398K
代理商： SED122ADXA
4–16
EPSON
SED1220
Voltage Tripler Circuit
If capacitors are connected between CAP+1 – CAP–1
and CAP2+,CAP2– and VSS VOUT, VDD– VSS potential
is negatively tripled and generated at VOUT terminal.
When the voltage is boosted double, open CAP2+ and
connect CAP2– to VOUT terminal.
At this time, the oscillating circuit must be operating
since the amplifying circuit utilize the signal from the
oscillation output.
VDD=0V
VS1 -2V
VOUT=VS1=-4V
VDD=0V
VS1 -2V
VOUT=3VS1 -6V
Potential relationship of amplified voltage
=
Where, VREG is the constant power supply within IC.
VREG is maintained constantly at VREG
2.0V.
Voltage regulation of V5 output is done by connecting to
a variable register between VR, VDD and V5. It is
recommended to combine fixed registers R1 and R3 with
variable resistor R2 for fine adjustment of V5 voltage.
[Sample setting on R1, R2 and R3]
R1 + R2 + R3 = 1.2 M ohm (decided from the current
value I05 passed between VDD – V5. Where, I05
≤5 A
is supposed).
Variable voltage range provided by R2 is from –4V to
–6V (to be decided considering charecteristics of the
liquid crystal).
Since VREG = 2.0V, if the electronic volume register is
set at (0, 0, 0, 0, 0), followings are derived from above
conditions and expression 1 :
R1 = 400K
R2 = 200K
R3 = 600K
The voltage regulation circuit outputs VREG with the
temperature gradient of approximately –0.04%/
°C.
Since VR terminal has high input impedance, anti-noise
measures must be considered including use of shortened
wiring distance and shield wire.
Voltage regulating circuit
Amplified voltage generated at VOUT outputs liquid crystal drive voltage V5 through the voltage regulation circuit.V5
voltage can be obtained from the expression 1 below by adjusting the resistors Ra and Rb within the range of
V5<VOUT.calculated by the following formula:
V5 = (1 +
Rb
) VREG
.............................. 1
Ra
R1
Ra
R2
VR
V0
VDD
VREG
R3
Rb
+
-
V5
=
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SED1278D0B 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:CMOS DOT MATRIX LCD CONTROLLER DRIVER
SED1278D0C 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:CMOS DOT MATRIX LCD CONTROLLER DRIVER
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