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參數(shù)資料
| 型號(hào)： | BU9728 |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | LCD driver for segment-type LCDs |
| 中文描述： | LCD驅(qū)動(dòng)段型液晶顯示器 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 103K |
| 代理商： | BU9728 |
8
Standard ICs
BU9728AKV
The display data input to the command / data register (when C / D is LOW) is written to the DDRAM address and the
address consisting of the specified address + 1, which are indicated by the upper four and lower four bits of the data,
respectively. The four bits of the display data are written sequentially, starting from the MSB, to the MSB of the
DDRAM bits.
MSB
If the Rewrite DDRAM command is input (C / D is HIGH), the four bits of the display data in the Rewrite DDRAM
command are written to the specified DDRAM address.
The four bits of the display data are written sequentially, starting from the MSB, to the MSB of the DDRAM bits.
(4) Timing generator
Connecting Rf between OSC
1
and OSC
2
causes the internal oscillator circuit to start oscillating, and generates a dis-
play timing signal. The oscillator can also be started by inputting an external clock.
(5) LCD drive power supply
The LCD drive power supply is generated by the BU9728AKV. The LCD drive voltage (V
LCD
) is supplied by V
DD
- V
3
,
and the power supply is generated by V
1
= 2 V
LCD
/ 3, V
2
= V
LCD
/ 3.
If an external bleeder resistance is used to supply the LCD drive voltage externally, the following relationship must
be observed:
V
DD
= V
1
^
V
2
^
V
3
^
V
SS
(6) LCD drive circuit
The LCD drive circuit is configured of four common drivers and 32 segment drivers. When oscillation begins, select-
ed waveforms are output automatically for valid common outputs by the common counter, and de-selected wave-
forms are output for other outputs.
For segment outputs, drive waveforms are output automatically by the display data and common counter.
The following page shows examples of common / segment output waveforms.
(bit3
bit0) (bit3
bit0)
D7
LSB
D6
D5
D4
D3
D2
D1
D0
Specified address
Specified address + 1
(bit3
bit0)
1
MSB
LSB
0
0
D3
D2
D1
D0
Rewrite DDRAM command
Display data
Fig. 3 Rf oscillator circuit
OSC
1
OSC
2
Rf
Fig. 5 Example of connection when
using internal power supply
V
DD
V
1
V
2
V
3
V
SS
Fig. 6 Example of connection when
using external power supply
V
DD
V
1
V
2
V
3
V
SS
Fig. 4 External clock input
OSC
1
OSC
2
OPEN
EXIT CLOCK INPUT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BU9728AKV | 制造商:ROHM Semiconductor 功能描述: |
| BU9728AKV_08 | 制造商:ROHM 制造商全稱:Rohm 功能描述:For 128-140 Segment type LCD LCD Segment Driver |
| BU9728AKV-E2 | 功能描述:LCD 驅(qū)動(dòng)器 LCD DRIVER 32X4 RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| BU9728AKV-E2-CUT TAPE | 制造商:ROHM 功能描述:BU Series 2.5 to 5.5 V 128 Segment Surface Mount Picture Cell Driver - VQFP-48C |
| BU9729 | 制造商:ROHM 制造商全稱:Rohm 功能描述:Segment-type LCD driver |
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