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9729KのメーカーはROHM Semiconductorです、この部品の機能は「 BU9729K」です。 |
部品番号 | 9729K |
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部品説明 | BU9729K | ||
メーカ | ROHM Semiconductor | ||
ロゴ | |||
このページの下部にプレビューと9729Kダウンロード(pdfファイル)リンクがあります。 Total 12 pages
Standard ICs
Segment-type LCD driver
BU9729K
The BU9729K is a driver for segmented liquid crystal displays, which enables connection with a microcomputer
through a serial interface. 4-bit common output and an internal power supply circuit for LCD drive make it possible to
configure a low-cost display system.
•Applications
Movie projectors, car audio equipment, telephones
•Features
1) Serial interface (8-bit length).
2) Display RAM: 72bits, internal (up to 72 segments
can be displayed).
3) Internal power supply circuit for liquid crystal drive.
4) Display duty: 1 / 4.
5) Low-voltage and low-current operation supported.
•Block diagram
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VLCD
LCD Driver
Bias Circuit
VC
VDD
VSS
SD
SCK
C/D
CS
Serial
Interface
Address
Counter
Display Data RAM
(DD RAM)
LCD
Segment
Driver
18bits
SEG1
SEG2
SEG18
Command / Data
Register
Command
Decoder
Timing
Generator
Common
Counter
LCD
Common
Driver
4bits
COM1
COM2
COM3
COM4
1
1 Page Standard ICs
BU9729K
•Pin descriptions
Pin name Pin No.
OSC1
OSC2
1
2
VSS
VC
VLCD
VDD
3
4
5
6
SCK
7
I/O
I
O
—
—
—
I
SD 8
I
CS 9
I
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C/D
10
I
COM1
~
COM4
SEG1
~
SEG18
11 ~ 14
15 ~ 32
O
O
Function
These are the I / O pins for the internal oscillator.
Resistance should be connected between the pins when the internal clock is operating.
When an external clock is operating, input should be done from OSC1, and OSC2 should be left open.
This is the VSS pin.
This is the power supply pin for LCD drive.
The condition VLCD м VC м VSS must be satisfied.
This is the VDD pin.
This is the shift lock input pin for serial data.
The contents of the SD pin are read one bit at a time at the rising edge of this pin.
This is the serial data input pin.
Display data and commands are input here.
When this is “0”, display data is not displayed, and when “1”, the data is displayed.
This is the chip select signal input pin.
When this is LOW, SD input can be received.
The SCK counter is incremented at the timing at which CS goes from HIGH to LOW.
This is the signal input which recognizes whether the SD input consists of commands or display data.
When the SCK of the eighth clock rises, this pin judges the input to be display data if the
level is LOW, and a command if the level is HIGH.
These are the common output pins for LCD drive.
They are connected to the commons of the LCD panel.
These are the segment output pins for LCD drive.
They are connected to the segments of the LCD panel.
•Absolute maximum ratings (Ta = 25°C, VSS = 0V)
Parameter
Symbol
Limits
Power supply voltage 1
Power supply voltage 2
VDD
VLCD
– 0.3 ~ + 7.0
– 0.3 ~ + 7.0∗1
Power dissipation
Pd
400∗2
Operating temperature
Topr
– 20 ~ + 75
Storage temperature
Tstg
– 55 ~ + 125
Input voltage
VIN – 0.3 ~ VDD + 0.3
Output voltage
VOUT
– 0.3 ~ VDD + 0.3
∗1 The condition VLCD м VC м VSS must be satisfied.
∗2 Reduced by – 4.0mW for each increase in Ta of 1°C over 25°C.
Unit
V
V
mW
°C
°C
V
V
3
3Pages Standard ICs
•Timing charts
tWL2
CS
SCK
SD
tSU2
tCYC
tWH1
tWL1
tSU1
tTLH1
tH1
tTHL
tSCH
tSU3
C/D
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Fig. 2 Interface timing
SCK
tCYC
tWH2
tH2
BU9729K
tCCH
tH3
tWA / T
SD D7 D6
D0 D7
Fig. 3 Command cycle
•Data format
Serial data is transmitted using four-line clock synchronous transmission. Serial data with a length of eight bits is
input synchronized to SCK. If C / D is HIGH at the rise of the 8 × nth clock of SCK, the serial data is recognized as a
command, and if C / D is LOW, the serial data is recognized as display data.
Serial data is input sequentially, starting from the MSB.
6
6 Page | |||
ページ | 合計 : 12 ページ | ||
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PDF ダウンロード | [ 9729K データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
9729K | BU9729K | ROHM Semiconductor |