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參數(shù)資料
| 型號(hào)： | KS0759 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | 81 COM / 128 SEG DRIVER & CONTROLLER FOR STN LCD |
| 中文描述： | 81的COM / 128賽格驅(qū)動(dòng) |
| 文件頁(yè)數(shù)： | 31/67頁(yè) |
| 文件大小： | 580K |
| 代理商： | KS0759 |
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KS0759 PRELIMINARY SPEC. VER. 0.2
81 COM / 128 SEG DRIVER & CONTROLLER FOR STN LCD
27
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 21, it is necessary to be applied internally or externally.
For the Eq. 1, we determine V0 by Ra, Rb and V
EV
. The Ra and Rb are connected internally or externally by
INTRS pin. And V
EV
called the voltage of electronic volume is determined by Eq. 2, where the parameter
α
is the
value selected by instruction, "Set Reference Voltage Register", within the range 0 to 63. V
REF
voltage at Ta=
25
°
C is shown in Table 11.
Rb
V0 = (1 +
) x V
EV
[V] ------ (Eq. 1)
Ra
(63 -
α
)
V
EV
= (1 -
) x V
REF
[V] ------ (Eq. 2)
210
Table 11. . V
REF
Voltage at Ta = 25
°
C
REF
Temp. coefficient
-0.05% /
°
C
External input
V
REF
[ V ]
1
2.1
0
VEXT
V
EV
GND
Ra
Rb
VSS
VR
V0
VOUT
+
-
Figure 21. Internal Voltage Regulator Circuit
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