Portable, battery-powered operation of electronic apparatushas become increasingly desirable. Medical, remotedata acquisition, power monitoring and other applicationsare good candidates for battery operation. In some circumstances,due to space, power or reliability considerations,it is preferable to operate the circuitry from a single 1.5Vcell. Unfortunately, a 1.5V supply eliminates almost alllinear ICs as design candidates. In fact, the LM10 opamp-reference and the LT®1017/LT1018 comparators arethe only IC gain blocks fully specifi ed for 1.5V operation.Further complications are presented by the 600mV dropof silicon transistors and diodes. This limitation consumesa substantial portion of available supply range, makingcircuit design diffi cult. Additionally, any circuit designedfor 1.5V operation must function at end-of-life batteryvoltage, typically 1.3V. (See Box Section, “Componentsfor 1.5V Operation.”)
標簽: Circuitry Operation Single 1017
上傳時間: 2013-12-20
上傳用戶:Wwill
Abstract: Using a wafer-level package (WLP) can reduce the overall size and cost of your solution.However when using a WLP IC, the printed circuit board (PCB) layout can become more complex and, ifnot carefully planned, result in an unreliable design. This article presents some PCB designconsiderations and general recommendations for choosing a 0.4mm- or 0.5mm-pitch WLP for yourapplication.
標簽: Considerations Guidelines and Design
上傳時間: 2013-10-14
上傳用戶:ysystc699
基于AVR單片機的前饋控制逆變電源
上傳時間: 2013-10-23
上傳用戶:黃蛋的蛋黃
個人構思的基于AVR單片機的恒壓恒流電源源,獻丑了。
上傳時間: 2013-11-22
上傳用戶:toyoad
摘要:本裝置主要以AVR單片機為核心,通過SG3 5 25芯片完成DC-DC穩(wěn)壓電路,有單片機產(chǎn)生的SPWM波形完成DC-AC逆變并網(wǎng)。SPWM波形,經(jīng)光耦將主電路與控制電路隔離后將信號由一個非門變?yōu)閮陕坊bSPWM波形作為IR2110驅動芯片的輸入,兩個IR2110輸出控制逆變環(huán)節(jié)的MOS管導通。使整個系統(tǒng)能夠穩(wěn)定的工作規(guī)定范圍內(nèi),通過采樣環(huán)節(jié),可以做到實時的調整。也可以通過采樣電流的信號對系統(tǒng)的過電流進行保護,設置了欠電壓工作點,通過這些環(huán)節(jié),使系統(tǒng)在出現(xiàn)故障后能夠有良好的保護。
上傳時間: 2013-11-07
上傳用戶:cange111
Portable, battery-powered operation of electronic apparatushas become increasingly desirable. Medical, remotedata acquisition, power monitoring and other applicationsare good candidates for batteryoperation. In some circumstances,due to space, power or reliability considerations,it is preferable to operate the circuitry from a single 1.5Vcell. Unfortunately, a 1.5V supply eliminates almost alllinear ICs as design candidates. In fact, the LM10 opamp-reference and the LT®1017/LT1018 comparators arethe only IC gain blocks fully specifi ed for 1.5V operation.Further complications are presented by the 600mV dropof silicon transistors and diodes. This limitation consumesa substantial portion of available supply range, makingcircuit design diffi cult. Additionally, any circuit designedfor 1.5V operation mustfunction at end-of-life batteryvoltage, typically 1.3V. (See Box Section, “Componentsfor 1.5V Operation.”)
標簽: Circuitry Operation Single Cell
上傳時間: 2013-10-30
上傳用戶:hz07104032
在 IAR 開發(fā)環(huán)境中可以使用兩種方法新建工程。一是 開發(fā)環(huán)境中可以使用兩種方法新建工程。一是 新建 創(chuàng)建法, 新建 創(chuàng)建法是在空 白工程的基礎上將所需源文件按功能逐一添加到 IAR 分組中進而成一 個完整的工程;另分組中進而成一 個完整的工程;另種是復制創(chuàng)建法, 復制創(chuàng)建法是在已有模板上而成的 。兩種方法 各有千秋。復制創(chuàng)建兩種方法 各有千秋。復制創(chuàng)建便于快速創(chuàng)建工程,節(jié)省了一步添加文件的時間; 便于快速創(chuàng)建工程,節(jié)省了一步添加文件的時間; 新建 創(chuàng)建法便于設計 個性化 的工程 文 件架構。下面章節(jié)我們將 詳細 介紹 兩種 創(chuàng)建工程 的方法。
上傳時間: 2013-12-11
上傳用戶:yl1140vista
設計了一種基于兩片AVR單片機的交通誘導屏顯示單元控制系統(tǒng),該系統(tǒng)由通信模塊、顯示控制模塊和開關模塊3部分組成。單片機A用于以RS-485的通信方式接收數(shù)據(jù)和應答主機,把處理好的數(shù)據(jù)發(fā)送到I/O口并寫入EEPROM中,再通知單片機B讀取數(shù)據(jù)。單片機B接收到數(shù)據(jù)后控制LED顯示,通過調節(jié)驅動LED電流占空比的方式調節(jié)LED的亮度。給出了控制系統(tǒng)的硬件和軟件設計方案。
標簽: AVR 顯示單元 控制系統(tǒng)設計
上傳時間: 2013-10-13
上傳用戶:wenyuoo
AVR下載器設計progisp166
上傳時間: 2013-11-18
上傳用戶:lionlwy
AVR
上傳時間: 2014-11-28
上傳用戶:wangcehnglin