參數(shù)資料
型號： HD66420
廠商： Hitachi,Ltd.
英文描述： (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)
中文描述： （內(nèi)存提供160通道4級灰度的點陣圖形液晶顯示驅(qū)動程序）
文件頁數(shù)： 34/52頁
文件大?。?/td> 167K
代理商： HD66420
HD66420
34
Power Down Modes
The HD66420 has a standby function providing low power-dissipation, which is initiated by internal
register settings. During standby mode, all the HD66420 functions are inactive and data in the display
RAM and internal registers except the DISP bit are retained. However, only control registers can be
accessed during standby mode. HD66420 has an another power down mode: partial display. In this mode
only a part of display is active. However, this duty ratio is 1/8 so the external power supply for LCD drive
will be inactive. The oscillator does not halt, thus dissipating more power than standby mode. Table 7 lists
the LCD driver output pin status during standby mode. Figure 20 shows the procedure for initiating and
canceling a standby mode and figure 21 shows the procedure for changing oscillator. Note that these
procedure must be strictly followed to protect data in the display RAM.
Table 7 Output Pin Status during Power Down modes
Signal Name
STBY
Status
COM1–COM80
1
Output VLCD (display off)
0
Output common signals (VLCD–GND)
SEG1–SEG160
1
Output VLCD (display off)
0
Output segment signals (VLCD–GND)
Set STBY bit to 1 (control register 1)
Clear STBY and PWR bits to 0 (control register 1)
Oscillation halts
External power supply off
Oscillator starts
Internal operation starts
Display starts
Standby mode
Initiation
Cancellation
Wait for oscillation and external
power supply to stabilize
Set DISP bit to 1 (control register 1)
Figure 20 Procedure for Initiation and Canceling a Standby Mode
相關(guān)PDF資料
PDF描述
HD66420TA0 LCD Display Driver
HD66421 (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)
HD66421TB0 (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)
HD66503 240-Channel Common Driver with Internal LCD Timing Circuit(帶內(nèi)部LCD定時電路的240通道驅(qū)動器)
HD66520T 160-Channel 4-Level Grayscale Display Column Driver with Internal Bit-Map RAM(點陣圖形LCD160通道驅(qū)動器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD66420TA0 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:LCD Display Driver
HD66421 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:(RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)
HD66421TB0 制造商:Renesas Electronics Corporation 功能描述:
HD66503 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver
HD66520 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver
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