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參數資料
| 型號： | UPD16681W-011 |
| 廠商： | NEC Corp. |
| 英文描述： | LCD CONTROLLER/DRIVER FOR DOT MATRIX DISPLAY OF JIS LEVEL 1 AND JIS LEVEL 2 KANJI SETS |
| 中文描述： | LCD控制器/的點陣顯示為JIS 1級和日標平驅動2漢字集 |
| 文件頁數： | 8/56頁 |
| 文件大小： | 906K |
| 代理商： | UPD16681W-011 |
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Data Sheet S13104EJ5V0DS00
8
μ
PD16681
4. POWER SUPPLY CIRCUIT
A switchable (3x or 4x) boost circuit is included to generate a current for driving the LCD. A connection to a boost-
related capacitor is used to switch the boost circuit’s setting.
The V
EXT
pin (H: external, L: internal) is used to switch between using an external LCD driver power supply or the
on-chip boost circuit.
4.1 Boost Circuit
When using the internal power supply, connect the boost-related capacitor between C
1+
and C
1
, C
2
+
and C
2
, and
C
3
+
and C
3
. Also, connect the capacitor for level stabilization between V
LCD
and V
SS
, and set V
EXT
low to boost the
potential between V
DD
and V
SS
from 3 to 4 times.
Since the boost 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
DD
pins all relate to the boost circuit, so the wire impedance should be
minimized.
Figure 4-1. 3x and 4x Boost Mode
V
DD
= 3 V
V
SS
= 0 V
V
LCD
= 3V
DD
=
9 V
(During 3x boost mode )
V
LCD
= 4V
DD
=
12 V
(During 4x boost mode)
Note
Note
When set for 3x boost, connect boost-related capacitors between C
2
and C
3
+
and C
1
+
and C
1
.
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相關代理商/技術參數 |
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|---|---|
| UPD16682 | 制造商:NEC 制造商全稱:NEC 功能描述:1/65 DUTY LCD CONTROLLER/DRIVER WITH ON-CHIP RAM |
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| UPD16682AP | 制造商:NEC 制造商全稱:NEC 功能描述:1/65 DUTY LCD CONTROLLER/DRIVER WITH ON-CHIP RAM |
| UPD16682AW | 制造商:NEC 制造商全稱:NEC 功能描述:1/65 DUTY LCD CONTROLLER/DRIVER WITH ON-CHIP RAM |
| UPD16682N | 制造商:NEC 制造商全稱:NEC 功能描述:1/65 DUTY LCD CONTROLLER/DRIVER WITH ON-CHIP RAM |
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