- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376424 > UPD17236GT (NEC Corp.) 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER PDF資料下載
參數(shù)資料
| 型號(hào)： | UPD17236GT |
| 廠商： | NEC Corp. |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機(jī)的小型通用紅外遙控器 |
| 文件頁數(shù)： | 45/92頁 |
| 文件大?。?/td> | 378K |
| 代理商： | UPD17236GT |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁當(dāng)前第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁
Data Sheet U14360EJ1V0DS00
μ
PD17230, 17231, 17232, 17233, 17234, 17235, 17236
45
5.3.2
Countermeasures against noise during transmission (carrier output)
When a signal is transmitted from the transmitter of a remote controller, a peak current of 0.5 to 1 A may flow through
the infrared LED. Since two batteries are usually used as the power source of the transmitter, several
of equivalent
resistance (r) exists in the power source as shown in Figure 5-2. This resistance increases to 10 to 20
if the supply
voltage drops to 2 V. While the carrier is output from the REM pin (while the infrared LED lights), therefore, a high-
frequency noise may be generated on the power lines due to the voltage fluctuation that may take place especially
during switching.
To minimize the influence on the microcontroller of this high-frequency noise, take the following measures:
<1>
Separate the power lines of the microcontroller from the power lines of the infrared LED with the terminals
of the batteries at the center. Use thick power lines and keep the wiring short.
Locate the resonator as close as possible to the microcontroller and shield it with GND lines (as indicated
by the shaded portion in the figure below).
Locate the capacitor for stabilization of the power supply closely to the power lines of the microcontroller.
Also, use a capacitor to eliminate high-frequency noise.
To prevent data from changing, do not execute an interrupt that requires read/write processing and stack,
such as key scan interrupt, and the CALL/RET instruction, while the carrier is output.
To improve the reliability in case of program hang-up, use the watchdog timer.
<2>
<3>
<4>
<5>
Figure 5-2. Example of Countermeasures against Noise
0.5 to 1 A
Infrared LED
REM
V
DD
Microcomputer
+
–
r
Batteries
V
SS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UPD17236MC | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17230 | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17231 | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17231MC | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17232 | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD17236MC | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD1723GF-011-3BE | 制造商:NEC 制造商全稱:NEC 功能描述:PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LF TUNER CAR AUDIO |
| UPD1723GF-013 | 制造商:NEC 制造商全稱:NEC 功能描述:PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LF TUNER CAR AUDIO |
| UPD1723GF-211-3KE | 制造商:NEC 制造商全稱:NEC 功能描述:PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LF TUNER CAR AUDIO |
| UPD1723GF-213 | 制造商:NEC 制造商全稱:NEC 功能描述:PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LF TUNER CAR AUDIO |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。