參數(shù)資料
型號(hào): UPD7228A
廠商: NEC Corp.
英文描述: 1/8, 1/16 DUTY LCD CONTROLLER/DRIVER
中文描述: 1 / 8,1 / 16稅LCD控制器/驅(qū)動(dòng)
文件頁數(shù): 29/64頁
文件大?。?/td> 314K
代理商: UPD7228A
Data Sheet S10299EJ4V0DS00
29
μ
PD16434
5. LCD DRIVE REFERENCE VOLTAGE SUPPLY
The value of the LCD drive reference voltage to the
μ
PD16434 differs, depending on whether the number of time
divisions is 8 or 16, so that the LCD drive reference voltage should be set as shown in Figure 5–1 and Figure 5–2.
Figure 5–1. 8-Time-Divisions
Figure 5–2. 16-Time-Divisions
V
DD
(V
LC0
)V
DD
V
DD
V
LCD
V
LC1
V
LC2
V
LC3
V
LC4
V
LC5
V
DD
V
LCD
V
DD
V
LCD
V
DD
V
LCD
μ
PD16434
V
DD
(V
LC0
)
V
DD
V
DD
V
LCD
V
LC1
V
LC2
V
LC3
V
LC4
V
LC5
V
DD
V
LCD
V
DD
V
LCD
V
DD
V
LCD
μ
PD16434
V
DD
V
LCD
4
2
1
5
2
1
5
3
5
5
4
4
4
3
Remark
For both 8 and 16-time-divisions, the LCD drive voltage (L
LCD
) must not exceed V
DD
.
5.1 Supplying LCD Drive Reference Voltage by Resistor Network
Figure 5–3 and Figure 5–4 show circuit examples, which supply the LCD drive reference voltage indicated in
Figure 5–1 and Figure 5–2 using register networks which divide the voltage level between V
DD
and V
SS
.
Figure 5–3. 8-Time-Divisions Circuit Example
Figure 5–4. 16-Time-Divisions Circuit Example
V
DD
(V
LC0
)
V
DD
V
LC1
V
LC2
V
LC3
V
LC4
V
LC5
6.0 V
V
SS
R1
R1
R1
R1
R2
μ
PD16434
V
DD
(V
LC0
)
V
DD
V
LC1
V
LC2
V
LC3
V
LC4
V
LC5
6.0 V
V
SS
R1
R1
R1
R1
R1
R2
μ
PD16434
The values of R1 and R2, which divide the voltage for 8-time-divisions and 16-time-divisions, are determined by
the following expressions:
R1 =
×
R2 (8-time-divisions)
V
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