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參數(shù)資料
| 型號： | HD66702R |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function |
| 中文描述： | 低功耗點陣液晶顯示控制器/鍵掃描功能驅(qū)動程序 |
| 文件頁數(shù)： | 65/97頁 |
| 文件大小： | 513K |
| 代理商： | HD66702R |
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HD66727
65
When an Internal Booster and External Bleeder-Resistors are Used
When the internal operational amplifiers cannot fully drive the LCD panel used, V1 to V5 voltages can be
supplied through external bleeder-resistors (Figure 37). Here, the OPOFF pin must be set to the V
CC
level to
turn off the internal operational amplifiers. Since the internal contrast adjuster is disabled in this case,
contrast must be adjusted externally. Double- and triple-boosters can be used as they are.
C1
C2
Vci
V5OUT2
V5OUT3
+
GND
+
V
CC
V1OUT
V2OUT
V3OUT
V4OUT
V5OUT
V
CC
Notes: 1. Resistance of each external bleeder resistor should be 5 k
to 15 k
.
2. The bias current value for driving liquid-crystals can be varied by adjusting
the resistance (2R) between the V2OUT and V3OUT pins.
3. The internal contrast-adjuster is disabled; contrast must be adjusted either
by controlling the external variable resistor between V
EE
and V5OUT or Vci
for the booster.
4. Vci is both a reference voltage and power supply for the booster; connect it to
V
CC
directly or combine it with a transistor so that sufficient current can be
obtained.
5. Vci must be smaller than V
CC
.
–
+
–
+
–
+
–
+
–
+
V
EE
Booster
GND
+
0.47
μ
F
to 1
μ
F
0.47
μ
F
to 1
μ
F
0.47
μ
F
to 1
μ
F
HD66727
OPOFF = V
CC
R
R
R
R
VR
2R
V
CC
V1
V2
V3
V4
V5
Figure 37 Power Supply Circuit Example Using External Bleeder-Resistor for LCD Drive Voltage
Generation
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