UPD16434 NEC, UPD16434 Datasheet - Page 29

• Manufacturer Part Number: UPD16434
• Description: 1/8/ 1/16 DUTY LCD CONTROLLER/DRIVER
• Manufacturer: NEC

5. LCD DRIVE REFERENCE VOLTAGE SUPPLY
5.1 Supplying LCD Drive Reference Voltage by Resistor Network
The value of the LCD drive reference voltage to the
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 and Figure 5–2 using register networks which divide the voltage level between V
the following expressions:
Figure 5–3 and Figure 5–4 show circuit examples, which supply the LCD drive reference voltage indicated in
The values of R1 and R2, which divide the voltage for 8-time-divisions and 16-time-divisions, are determined by
R1 =
Figure 5–3. 8-Time-Divisions Circuit Example
4(V
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DD
Remark For both 8 and 16-time-divisions, the LCD drive voltage (L
V
LCD
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Figure 5–1. 8-Time-Divisions
V
LCD
)
(V
LC0
(V
R2 (8-time-divisions)
) V
LC0
V
V
V
V
V
V
LC1
LC2
LC3
LC4
LC5
DD
SS
)V
V
V
V
V
V
LC1
LC2
LC3
LC4
LC5
DD
R1
R1
R1
R1
R2
V
V
V
V
V
DD
DD
DD
DD
DD
Data Sheet S10299EJ4V0DS00
V
1
4
2
4
3
4
6.0 V
LCD
V
V
V
LCD
LCD
LCD
V
DD
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Figure 5–4. 16-Time-Divisions Circuit Example
Figure 5–2. 16-Time-Divisions
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(V
(V
LC0
LC0
LCD
) V
V
V
V
V
V
) V
V
V
V
V
V
V
LC1
LC2
LC3
LC4
LC5
) must not exceed V
DD
SS
LC1
LC2
LC3
LC4
LC5
DD
R1
R1
R1
R1
R1
R2
DD
and V
V
V
V
V
V
V
DD
DD
DD
DD
DD
DD
V
SS
1
5
2
5
3
5
4
5
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LCD
V
V
V
V
.
6.0 V
DD
LCD
LCD
LCD
LCD
.
V
DD
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