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參數(shù)資料
| 型號： | ML9050 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | 132-Channel LCD Driver with Built-in RAM for LCD Dot Matrix Displays |
| 中文描述： | 132通道液晶內(nèi)置液晶點(diǎn)陣顯示RAM的驅(qū)動(dòng)程序 |
| 文件頁數(shù)： | 24/71頁 |
| 文件大小： | 472K |
| 代理商： | ML9050 |
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Semiconductor
ML9050/9051
24/71
PEDL9050-02
(c) When external resistors are used (voltage V1 adjustment internal resistors are not used) - Case
2
It is possible to set the LCD drive power supply voltage V1 using fine adjustment of Ra' and Rb'
by adding a variable resistor to the case of using external resistors in the above case. Even in this
case, it is possible to control the LCD power supply voltage V1 and adjust the intensity of LCD
display using commands if the electronic potentiometer function is used.
The voltage V1 can be obtained by the following equation C-1 in the range of V1<V
OUT
by setting
the external resistors R
1
, R
2
(variable resistor), and R
3
appropriately and making fine adjustment
of R
2
(
D
R
2
).
V1 = (1+(R
3
+R
2
–
D
R
2
)/(R
1
+
D
R
2
)) VEV
= (1+(R
3
+R
2
–
D
R
2
)/(R
1
+
D
R
2
)) (1–(
a
/324)) VREG (Eqn. C-1)
Fig. 11
Setting example: Setting V1 in the range 5 V to 9 V using R
2
at Ta = 25C using an ML9050/9051
of the model with a temperature gradient of -0.05%/C.
When the electronic potentiometer register value is set to the middle value of (D5, D4, D3, D2,
D1, D0) = (1, 0, 0, 0, 0, 0), the value of
a
will be 31 and that of VREG will be 3.0 V, and hence in
order to make V1 = 9 V when
D
R
2
= 0
W
, the equation C-1 becomes as follows:
9 = (1+(R
3
+R
2
)/R
1
) (1–(31/324)) (3.0) (Eqn. C-2)
In order to make V1 = 5 V when
D
R
2
= R
2
,
5 = (1+R
3
/(R
1
+R
2
)) (1–(31/324)) (3.0) (Eqn. C-3)
Further, if the current flowing between V
SS
and V1 is set as 5
m
A, the value of R
1
+R
2
+R
3
becomes-
R
1
+R
2
+R
3
= 1.8M
W
(Eqn. C-4)
and hence,
R
1
= 542k
W
, R
2
= 436k
W
, R
3
= 822k
W
.
In this case, the variability range of voltage V1 using the electronic potentiometer function and
the increment size will be as given in Table 13.
Table 13
V1
Min
Typ
Unit
[V]
[mV]
Variability range
Increment size
4.45 (level 0)
17
7.0 (center value)
24
Max
9.96 (level 63)
31
+
–
Rb'
Ra'
External R
3
External R
2
External R
1
D
R
2
VR
VSS
VEV (Constant voltage generator +
electronic potentiometer)
V1
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