參數(shù)資料
型號: HD66727
廠商: Hitachi,Ltd.
英文描述: Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function(帶鍵掃描功能的圖形LCD控制器/驅(qū)動器)
中文描述: 低功耗點陣液晶顯示控制器/鍵掃描功能(帶鍵掃描功能的圖形液晶顯示控制器/驅(qū)動器驅(qū)動程序)
文件頁數(shù): 60/98頁
文件大?。?/td> 1576K
代理商: HD66727
HD66727
60
1
2
3
4
33
34
1
2
3
33
34
V
CC
V1
V4
V5
COM1
1-line selection period
V1
V4
V5
COM2
1 frame
V
CC
V1
V4
V5
COMS2
V
CC
V1
V4
V5
COMS1
V
CC
1 frame
Figure 32 LCD Drive Output Waveform Example (4-line display with 1/34 multiplexing duty ratio)
Power Supply for Liquid Crystal Display Drive
When External Power Supply and Internal Operational Amplifiers are Used
To supply LCD drive voltage directly from the external power supply without using the internal booster,
circuits should be connected as shown in Figure 33. Here, contrast can be adjusted through the CT bits of
the contrast control instruction.
The HD66727 incorporates a voltage-follower operational amplifier for each of V1 to V5 to reduce current
flowing through the internal bleeder-resistors, which generate different levels of liquid-crystal drive
voltages. Thus, potential differences between V
CC
and V1 and between V
EE
and V5 must be 0.4V or greater.
Note that the OPOFF pin must be grounded when using the operational amplifiers.
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