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參數(shù)資料
| 型號： | DRM045 |
| 英文描述： | Using the ASB520 MC68HC908QT2 Based Infrared Remote Control Reference PC Board Designer Reference Manual |
| 中文描述： | 使用ASB520 MC68HC908QT2的紅外遙控器參考PC板設(shè)計參考手冊 |
| 文件頁數(shù)： | 12/80頁 |
| 文件大?。?/td> | 1025K |
| 代理商： | DRM045 |
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Introduction
Designer Reference Manual
DRM040 — Rev 0
12
Introduction
MOTOROLA
1.2 Theory of Operation
The main objective of this project was to demonstrate that a low cost
power meter could be implemented without the use of an external
measurement device, by utilising the onchip 10bit A/D to perform the
current and voltage measurements. The A/D converter on the LJ12
accepts input voltages in the range between Vrefl to Vrefh and since the
A/D is unipolar, operating from a +5Vdc supply, Vrefl is limited to Vss
and Vrefh is limited to Vdd.(+5V). Thus, the AC input signals of voltage
and current have to shifted up and centered around 2,5 volts. This is
achieved by biasing one end of the secondaries of the voltage and
current transformers (See schematics in
Appendix A
for details). The
resulting waveform is shown in
Figure 1-1
.
Figure 1-1
.
AC input signals to A/D converter
All six channels of the A/D converter are used and sampled at a rate of
32 x 50 = 1600 Hertz. This high rate is necessary to quantize up to the
15th harmonic of the 50 Hertz input signal. The oversampling of the AC
inputs also increases accuracy since the quantization noise is reduced
by the averaging process.
The active (real) power calculation is derived from the instantaneous
power signal. Every 625 microseconds an input voltage, load current or
one quarter load current are sampled by the A/D converter and
multiplied to form an instantaneous power sample. The reconstructed
power waveform for voltage and current is shown in
Figure 1-2
.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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(biāo)準(zhǔn)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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