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| 型號： | UPD16682N |
| 廠商： | NEC Corp. |
| 英文描述： | 1/65 DUTY LCD CONTROLLER/DRIVER WITH ON-CHIP RAM |
| 中文描述： | 1 / 65稅LCD控制器/驅(qū)動器，片內(nèi)RAM |
| 文件頁數(shù)： | 21/56頁 |
| 文件大?。?/td> | 435K |
| 代理商： | UPD16682N |
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Data Sheet S13368EJ3V0DS00
21
μ
PD16682
10.2 Booster circuit
3x and 4x booster circuits have been incorporated in chip to generate the current driving the LCD.
When using the internal power supply, connect the booster-related capacitor between C
1+
and C
1–
, C
2+
and C
2–
, and
C
3+
and C
3–
. Also, connect the level stabilization-related capacitor between V
LCD
and V
SS
and set D
2
high to boost the
potential between V
DD2
and V
SS
from 3 to 4 times.
Since the booster circuit uses signals from the internal oscillation circuit, the oscillation circuit must be operating.
The relation between the boosted voltage and the potential is described below.
The C
1+
, C
1–
, C
2+
, C
2–
, C
3+
, C
3–
, and V
DD2
pins all relate to the booster circuit, so the wire impedance should be
minimized.
Figure 10
1. 3x and 4x Booster Circuits
V
DD2
= 3 V
V
SS
= 0 V
V
LCD
= 3V
DD2 =
9 V
(During 3x boost mode)
V
LCD
= 4V
DD2 =
12 V
(During 4x boost mode)
Caution When set to 3x boost mode, connect booster-related capacitors between C
2–
and C
3+
and between C
1+
and C
1–
.
10.3 Voltage Regulator Circuit
The boost voltage that was generated at V
LCD
is output via the voltage regulator circuit as the LCD drive voltage
V
LC1
. Since the
μ
PD16682 has a 64-level electronic volume function and an on-chip resistor for V
LC1
voltage
regulation, various components can be used to configure a highly accurate voltage regulator circuit.
10.3.1 Use of on-chip resistor for V
LC1
voltage regulation
The on-chip resistor for V
LC1
voltage regulation and the electronic volume function can be used to regulate the
darkness of the LCD contents, not only by adding an external resistor but also by controlling the LCD drive voltage
V
LC1
by using commands only. The V
LC1
voltage can be determined using equation 10
1 as within the range of V
LC1
< V
LCD
.
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