s6b0724 Densitron Corporation, s6b0724 Datasheet - Page 31

• Manufacturer Part Number: s6b0724
• Description: 132 Seg / 65 Com Driver & Controller For Stn Lcd
• Manufacturer: Densitron Corporation

S6B0724
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 shown in figure 15, it is necessary to be applied internally or externally.
For the Eq. 1, we determine V0 by Ra, Rb and V
pin. And V
selected by instruction, "Set Reference Voltage Register", within the range 0 to 63. V
shown in table 14-1.
SV5
0
0
1
1
1
:
:
:
:
EV
PRELIMINARY SPEC. VER. 1.1
V0 = ( 1 +
V
called the voltage of electronic volume is determined by Eq. 2, where the parameter
EV
SV4
= ( 1 -
0
0
0
1
1
:
:
:
:
Table 14-2. Electronic Contrast Control Register (64 Steps)
SV3
Rb
Ra
0
0
0
1
1
REF
:
:
:
:
(63 - )
H
L
162
) x V
Table 14-1. V
SV2
EV
0
0
0
1
1
) x V
:
:
:
:
[V] ------ (Eq. 1)
REF
SV1
EV
Temp. coefficient
0
0
0
1
1
:
:
:
:
[V] ------ (Eq. 2)
. The Ra and Rb are connected internally or externally by INTRS
REF
External input
-0.05% / C
Voltage at Ta = 25 C
132 SEG / 65 COM DRIVER & CONTROLLER FOR STN LCD
SV0
0
1
0
0
1
:
:
:
:
Reference voltage
parameter ( )
32 (default)
62
63
0
1
:
:
:
:
V
REF
VEXT
2.1
[V]
REF
voltage at Ta = 25 C is
Maximum
Minimum
V0
:
:
:
:
:
is the value
Contrast
High
Low
:
:
:
:
:
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