Keil 自帶的 RTX51—TIny 系統(tǒng)有這樣幾個缺點(diǎn):1、非占先式任 務(wù)調(diào)度,這樣系統(tǒng)的實(shí)時性就很難保證 2、提供的系統(tǒng)服務(wù)太少, 只有 wait 與 signal。而 RTX51—TIny 的優(yōu)點(diǎn)是:1、Keil 公司自己開 發(fā)的,使用_task_關(guān)鍵字區(qū)別每個任務(wù),這樣可以使得被不同任務(wù)調(diào) 用的不同函數(shù)即使沒有相互調(diào)用,他們的局部變量也不會相互覆蓋。 免去了在 SmallRTOS 中需要手動制止函數(shù)間局部變量的相互覆蓋。 2、內(nèi)核小。整個 RTX51--TIny 完整編譯只需 900B 的空間。
標(biāo)簽： TIny RTX signal Keil
上傳時間： 2014-10-14
上傳用戶：zuozuo1215
TIny Encryption Algorithm for secure communication.
標(biāo)簽： communication Encryption Algorithm secure
上傳時間： 2014-01-03
上傳用戶：大三三
隨著國內(nèi)交流伺服電機(jī)等硬件技術(shù)逐步成熟，高運(yùn)算能力的控制芯片與電機(jī)控制技術(shù)相結(jié)合，具有高效、節(jié)能和可移植性好等特點(diǎn)，這樣使得交流伺服系統(tǒng)成為現(xiàn)代電機(jī)伺服驅(qū)動系統(tǒng)的一個發(fā)展趨勢。 本文主要是基于MCU研究和設(shè)計了交流永磁電機(jī)位置伺服控制系統(tǒng)。針對三相永磁同步電機(jī)的物理方程，通過坐標(biāo)轉(zhuǎn)換，在d-q旋轉(zhuǎn)坐標(biāo)系下建立轉(zhuǎn)矩方程，采用Id=0的矢量控制策略，建立一套完整的全數(shù)字交流位置伺服控制系統(tǒng)。 硬件方面，采用的是瑞薩公司專用電機(jī)控制TIny系列芯片M30262F8作為控制芯片，并由三菱公司的第三代IPM模塊PS21564實(shí)現(xiàn)功率驅(qū)動，簡化了系統(tǒng)電路，縮小了系統(tǒng)的體積，提高了系統(tǒng)的可靠性。由交流電流傳感器檢測三相定子繞組電流；由增量式磁性編碼器檢測永磁轉(zhuǎn)子位置，并設(shè)計一種比較快速的轉(zhuǎn)子初始檢測方法。 軟件方面，采用結(jié)構(gòu)化語言C和單片機(jī)M16C匯編語言混編，實(shí)現(xiàn)了單片機(jī)初始化、三環(huán)控制、電流跟隨型PWM控制，提高編寫代碼的效率，同時保證系統(tǒng)的實(shí)時控制性能；由軟件方式實(shí)現(xiàn)經(jīng)典PID控制和簡單模糊控制相結(jié)合構(gòu)成“串聯(lián)校正”閉環(huán)控制系統(tǒng)，提高了系統(tǒng)的快速性和抗干擾能力。此外，本文對控制策略進(jìn)行了研究，闡述了模糊PID控制策略；還介紹了SPWM、SVPWM和跟隨型PWM調(diào)制。 實(shí)驗(yàn)結(jié)果表明，本文所設(shè)計的伺服控制系統(tǒng)能實(shí)現(xiàn)電機(jī)的啟動，調(diào)速和定位等，并能達(dá)到系統(tǒng)的性能指標(biāo)。
標(biāo)簽： 位置伺服 控制系統(tǒng)
上傳時間： 2013-05-19
上傳用戶：327000306
Abstract: The MAX3108 is a complete high-performance universal asynchronous receiver-transmitter (UART) in a TIny 2.1mm ×
標(biāo)簽： Programming Rates Baud 3108
上傳時間： 2014-12-23
上傳用戶：清風(fēng)冷雨
The LM20, LM45, LM50, LM60, LM61, and LM62 are analog output temperature sensors. They have various output voltage slopes (6.25mV/°C to 17mV/°C) and power supply voltage ranges (2.4V to 10V).The LM20 is the smallest, lowest power consumption analog output temperature sensor National Semiconductor has released. The LM70 and LM74 are MICROWIRE/SPI compatible digital temperature sensors. The LM70 has a resolution of 0.125°C while the LM74 has a resolution of 0.625°C. The LM74 is the most accurate of the two with an accuracy better than ±1.25°C. The LM75 is National’s first digital output temperature sensor, released several years ago.
標(biāo)簽： temperatu TIny 遠(yuǎn)程系統(tǒng) 溫度傳感器
上傳時間： 2014-12-23
上傳用戶：yl8908
The LTC®3414 offers a compact and efficient voltage regulatorsolution for point of load conversion in electronicsystems that require low output voltages (down to 0.8V)from a 2.5V to 5V power bus. Internal power MOSFETswitches, with only 67mW on-resistance, allow theLTC3414 to deliver up to 4A of output current with efficiencyas high as 94%. The LTC3414 saves space by operatingwith switching frequencies as high as 4MHz, enabling theuse of TIny inductors and capacitors.
標(biāo)簽： 同步穩(wěn)壓器 元件 驅(qū)動 負(fù)載
上傳時間： 2014-01-03
上傳用戶：dongbaobao
Automotive batteries, industrial power supplies, distributedsupplies and wall transformers are all sources ofwide-ranging high voltage inputs. The easiest way to stepdown these sources is with a high voltage monolithicstep-down regulator that can directly accept a wide inputrange and produce a well-regulated output. The LT®3493accepts inputs from 3.6V to 36V and LT3481 acceptsinputs from 3.6V to 34V. Both provide excellent lineand load regulation and dynamic response. The LT3481offers a high effi ciency solution over a wide load range andkeeps the output ripple low during Burst Mode® operationwhile the LT3493 provides a TIny solution with minimalexternal components. The LT3493 operates at 750kHzand the LT3481 has adjustable frequency from 300kHzto 2.8MHz. High frequency operation enables the use ofsmall, low cost inductors and ceramic capacitors.
標(biāo)簽： 寬 輸入 降壓型穩(wěn)壓器
上傳時間： 2014-12-24
上傳用戶：Pzj
Handheld designers often grapple with ways to de-bounceand control the on/off pushbutton of portable devices.Traditional de-bounce designs use discrete logic, fl ipflops, resistors and capacitors. Other designs includean onboard microprocessor and discrete comparatorswhich continuously consume battery power. For highvoltage multicell battery applications, a high voltageLDO is needed to drive the low voltage devices. All thisextra circuitry not only increases required board spaceand design complexity, but also drains the battery whenthe handheld device is turned off. Linear Technology addressesthis pushbutton interface challenge with a pairof TIny pushbutton controllers.
標(biāo)簽： 按鍵開關(guān) 控制器 系統(tǒng)設(shè)計
上傳時間： 2013-11-18
上傳用戶：ZJX5201314
The LTC®3569 is a compact power solution for handhelddevices. Its TIny 3mm × 3mm QFN package includesthree buck regulators with individually programmableoutput voltages. One regulator supports load currentsup to 1200mA, while the other two support currents to600mA. Two regulators can be paralleled for increasedload capability. Each current-mode regulator is internallycompensated with excellent load and line regulation. Acomplete 2- or 3-output solution requires a minimumof external passive components.
標(biāo)簽： Wire 降壓穩(wěn)壓器 動態(tài) 可編程
上傳時間： 2013-10-11
上傳用戶：yxgi5
An essential component of a noise-free audio device isa clean power supply, but few switching regulators canoperate at high efficiency while keeping the switchingfrequency out of the audio band. The LTC®3620 fills thisvoid. It is a high efficiency 15mA buck regulator with aprogrammable minimum switching frequency, making itpossible to virtually eliminate audible switching noise. Theinternal synchronous switches and low quiescent currentof this buck regulator provide the ability to maintain highefficiency, while its small footprint makes it ideal for TIny,low power audio applications.
標(biāo)簽： 超低功率 控制 開關(guān)噪聲 方案
上傳時間： 2013-10-21
上傳用戶：非衣2016
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