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參數(shù)資料
| 型號： | DRM015 |
| 英文描述： | USB Hub Keyboard for the MC68HC08KH12 Designer Reference Manual |
| 中文描述： | USB集線器鍵盤參考手冊為MC68HC08KH12設(shè)計師 |
| 文件頁數(shù)： | 22/72頁 |
| 文件大?。?/td> | 1177K |
| 代理商： | DRM015 |
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Vacuum Cleaner Reference Design
Designer Reference Manual
DRM010 — Rev 0
22
Vacuum Cleaner Reference Design
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
An additional NPN transistor (Q5) is used to provide an accurate zero
voltage crossing detection circuit. The zero voltage crossing circuit
outputs a square wave to the MCU input capture. The NPN provides a
square wave output over a wide range of input voltages. Two or more
resistors in series may be required due to the limited voltage rating of
metal film or chip resistors. A jumper is also included, providing a
convenient connection to a pulse generator for debugging purposes.
One of the port pins is used to drive an LED. This is used to indicate the
software has synchronized with the ac line to aid with debugging.
1.4 Phase Angle Control Basics
The concept of phase angle control is to apply only a portion of the ac
waveform to the load. This is illustrated in
Figure 1-7
. Once fired, the
triac will conduct until the next zero crossing. The average voltage is
proportional to the shaded area under the curve. The phase angle is
measured from the trigger point to the next zero crossing. This is also
referred to as the conduction angle or firing angle.
The phase angle is varied continuously and results in a variety of voltage
waveforms. This is illustrated in
Figure 1-8
. The phase angle control
software should be able to smoothly vary the phase angle to control the
average voltage applied to the load. Rotating the potentiometer should
increase the phase angle and use a larger portion of the sine wave.
F
Freescale Semiconductor, Inc.
n
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DRM10 | 功能描述:DIP 開關(guān)/ SIP 開關(guān) BCD 10 POS RoHS:否 制造商:Omron Electronics 位置數(shù)量:10 開關(guān)類型:DIP 執(zhí)行器:Rotary 端子節(jié)距:2.54 mm 觸點形式: 端接類型:Solder Pin 電流額定值:100 mA 電壓額定值 DC: 工作溫度范圍: 安裝:Through Hole |
| DRM1004 | 功能描述:DIP 開關(guān)/ SIP 開關(guān) ROTARY DIP SWITCH PLASTICSHAFT RoHS:否 制造商:Omron Electronics 位置數(shù)量:10 開關(guān)類型:DIP 執(zhí)行器:Rotary 端子節(jié)距:2.54 mm 觸點形式: 端接類型:Solder Pin 電流額定值:100 mA 電壓額定值 DC: 工作溫度范圍: 安裝:Through Hole |
| DRM101 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Blood Pressure Monitor Using the Flexis QE128 Family |
| DRM10C | 功能描述:SWITCH DIP MINI SHAFT 10POS T/H RoHS:否 類別:開關(guān) >> DIP 系列:DR 特色產(chǎn)品:RDM Series Rotary DIP Switch 標準包裝:70 系列:RDM 電路:十六進制 位置數(shù):16 觸點額定電壓:0.1A @ 42VDC 觸動器類型:用于工具旋轉(zhuǎn) 觸動器電平:凹槽式 安裝類型:通孔 方向:頂部觸動 可清洗:是 其它名稱:EG4977-5RDMAR16PIT |
| DRM10C04 | 功能描述:編碼式波段開關(guān) SW DIP MINI SHAFT 10POS T/H RoHS:否 制造商:C&K Components 位置數(shù)量:10 輸出代碼:Binary Coded Decimal 執(zhí)行器:Screwdriver 觸點額定值: 端接類型:Solder Pin 封裝:Tube |
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