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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)： | 69/97頁 |
| 文件大?。?/td> | 513K |
| 代理商： | HD66702R |
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HD66727
69
Segment Display and Annunciator Display
The HD66727 provides both segment display, which is driven by the multiplexing method, and annunciator
display, which is driven statically. Annunciator display is driven at a logic operating voltage (V
CC
–
AGND) and is thus also available while the LCD drive power supply is turned off. Accordingly,
annunciator display is suitable for displaying marks during system standby, when it is desirable to reduce
current consumption. It is available in the sleep mode, where internal multiplexing operations for character
or segment display are halted. If an alternating signal is supplied to the EXM pin, it is also available in the
standby mode, where the internal R-C oscillator is halted. Here, AGND must be equal to or above the GND
level.
Note that annunciator display cannot share character display drivers SEG and COM but require special
drivers ASEG and ACOM that require long routing.
Tables 31 to 34 compare segment display to annunciator display. Figure 40 shows annunciator drive output
waveforms in two modes.
Table 31
Comparison between Segment Display and Annunciator Display
Item
Segment Display
Annunciator Display
Number of driven elements
40 each by 5-dot font width
48 each by 6-dot font width
12
Blinking
Impossible
Possible
Segment drivers
SEG1–SEG60
(shared with character display)
ASEG1–ASEG12
(independent of character display)
Common drivers
COMS1, COMS2
ACOM
LCD power supply
V
– V5
(LCD power supply necessary)
V
– AGND
(LCD power supply unnecessary)
Normal mode display
Possible together with
character display by multiplexing
drive
Possible by static drive
Sleep mode display
Impossible
(SEG and COM output V
CC
)
Impossible
(SEG and COM output V
CC
)
Possible by static drive
Standby mode display
(without oscillation)
Possible by supplying alternating
signal to the EXM pin
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