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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 23/71頁(yè) |
| 文件大小： | 472K |
| 代理商： | ML9050 |
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Semiconductor
ML9050/9051
23/71
PEDL9050-02
(b) When external resistors are used (voltage V1 adjustment internal resistors are not used) - Case
1
It is also possible to set the LCD drive power supply voltage V1 without using the internal
resistors for voltage V1 adjustment but connecting external resistors (Ra' and Rb') between V
SS
& VR and between VR & V1. 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 B-1 in the range of V1<V
OUT
by setting
the external resistors Ra' and Rb' appropriately.
V1 = (1+(Rb'/Ra')) VEV = (1+(Rb'/Ra')) (1–(
a
/324)) VREG (Eqn. B-1)
Fig. 10
Setting example: Setting V1 = 7 V 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 the
equation B-1 becomes as follows:
V1 = (1+(Rb'/Ra')) (1–(
a
/324)) VREG
7 = (1+(Rb'/Ra')) (1–(31/324)) 3.0 (Eqn. B-2)
Further, if the current flowing through Ra' and Rb' is set as 5
m
A, the value of Ra'+Rb' will be -
Ra'+Rb' = 1.4M
W
(Eqn. B-3)
and hence,
Rb'/Ra' = 1.58, Ra' = 543k
W
, Rb' = 857k
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 12.
Table 12
V1
Min
Typ
Unit
[V]
[mV]
Variability range
Increment size
6.24 (level 0)
7.0 (center value)
24
Max
7.74 (level 63)
+
–
V
SS
V1
External Ra'
External Rb'
VEV (Constant voltage generator +
electronic potentiometer)
VR
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