參數資料
型號: HD66732
廠商: Hitachi,Ltd.
英文描述: Graphics Liquid Crystal Display Controller/Driver Supporting JIS Level-1 and Level-2 Kanji ROM(圖形LCD控制器/驅動器)
中文描述: 圖形液晶顯示控制器/驅動器支持日標級- 1和第2級漢字光盤(圖形液晶顯示控制器/驅動器)
文件頁數: 77/133頁
文件大?。?/td> 2608K
代理商: HD66732
HD66732
77
C1+
C1-
C2+
C2-
V
LCD
V
LCD
VR
R
0
R
R
R
-
+
-
+
-
+
-
+
-
+
GND
Booster
OPOFF = GND
R
HD66732
V1OUT
+
V2OUT
V3OUT
V4OUT
V5OUT
+
+
+
+
LCD
driver
SEG1 to SEG120
COM1 to COM52
COMS1 to COMS2
V1
V3
V4
V2
V5
GND
Vci
VLOUT
0.1
μ
F
to 0.5
μ
F
GND
Figure 36 External Power Supply Circuit for LCD Drive Voltage Generation
When an Internal Booster and Internal Operational Amplifiers are Used
To supply LCD drive voltage using the internal booster, circuits should be connected as shown in figure 37.
Here, contrast can be adjusted through the CT bits of the contrast control instruction. Temperature can be
compensated either through the CT bits or by controlling the reference voltage for the booster (Vci pin)
using a thermistor.
Note that Vci is both a reference voltage and power supply for the booster. The reference voltage must
therefore be adjusted using an emitter-follower or a similar element so that sufficient current can be
supplied. In this case, Vci must be equal to or smaller than the V
CC
level.
The HD66732 incorporates a voltage-follower operational amplifier for each of V1 to V5 to reduce current
flowing through the internal bleeder-resistors, which generate different liquid-crystal drive voltages. Thus,
the potential difference between V
LCD
and V1 must be 0.1 V or higher, and ones between V4 and GND and
between V2 and GND must be 1.4 V or higher. Note that the OPOFF pin must be grounded when using the
operational amplifiers. Place a capacitor of about 0.1
μ
F to 0.5
μ
F between each internal operational
amplifier V1OUT to V5OUT output and GND and stabilize the output level of the operational amplifier.
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