s6b0724 Densitron Corporation, s6b0724 Datasheet - Page 31
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s6b0724
Manufacturer Part Number
s6b0724
Description
132 Seg / 65 Com Driver & Controller For Stn Lcd
Manufacturer
Densitron Corporation
Datasheet
1.S6B0724.pdf
(72 pages)
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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
:
:
:
:
:
27