SL20T0081 System Logic Semiconductor, SL20T0081 Datasheet - Page 24

• Manufacturer Part Number: SL20T0081
• Description: SLS System Logic Semiconductor
• Manufacturer: System Logic Semiconductor

SLS System Logic Semiconductor
Voltage Regulator Circuits
The function of the internal voltage regulator circuits is to determine liquid crystal operating voltage, V0,by adjusting
resistors, Ra and Rb, within the range of [V0]< [VOUT]. Because VOUT is the operating voltage of operational
amplifier circuits showing Figure 10, it is necessary to be applied internally or externally.
VEV called the voltage of electronic volume is determined by Eq. 2,, where the parameter
instruction, “Set Reference Voltage Register”, within the range 0 to 63. VREF voltage at Ta = 25
table 9.
Table 9. VREF Voltage at Ta = 25
Table 10. Electronic Contrast Control Register (64 Steps)
For the Eq. 1, we determine V0 by Ra, Rb and VEV. The Ra are connected internally or externally by INTRS pin. And
VR5
V0 = ( 1 +
V
0
0
1
1
1
:
:
:
:
EV
= ( 1 -
REF
H
VR4
L
0
0
0
1
1
:
:
:
:
Rb
Ra
(63 - )
162
) x V
VR3
0
0
0
1
1
:
:
:
:
EV
) x V
Temp. coefficient
[V]
REF
External input
VR2
-0.05% /
0
0
0
1
1
:
:
:
:
[V]
o
C
VR1
o
0
0
0
1
1
C
:
:
:
:
(Eq.1)
(Eq.2)
VR0
1
0
0
0
1
:
:
:
:
VREF [V]
VEXT
2.1
Reference voltage
parameter
32(default)
62
63
0
1
:
:
:
:
Maximum
Minimum
V0
:
:
:
:
:
:
is the value selected by
SL20T0081
Contrast
o
C is shown in
High
Low
:
:
:
:
:
: