NXP Semiconductor designed the LPC2400 microcontrollers around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded Trace. The LPC2400 microcontrollers have 512 kB of on-chip high-speedFlash memory. This Flash memory includes a special 128-bit wide memory interface andaccelerator architecture that enables the CPU to execute sequential instructions fromFlash memory at the maximum 72 MHz system clock rate. This feature is available onlyon the LPC2000 ARM Microcontroller family of products. The LPC2400 can execute both32-bit ARM and 16-bit Thumb instructions. Support for the two Instruction Sets meansEngineers can choose to optimize their application for either performance or code size atthe sub-routine level. When the core executes instructions in Thumb state it can reducecode size by more than 30 % with only a small loss in performance while executinginstructions in ARM state maximizes core performance.
上傳時(shí)間： 2013-11-15
上傳用戶：zouxinwang
Field Programmable Gate Arrays (FPGAs) are becoming a critical part of every system design. Many vendors offer many different architectures and processes. Which one is right for your design? How do you design one of these so that it works correctly and functions as you expect in your entire system? These are the questions that this paper sets out to answer.
上傳時(shí)間： 2013-10-29
上傳用戶：lixqiang
由于近些年來(lái)智能電網(wǎng)的大力發(fā)展需求出現(xiàn)了各種自動(dòng)抄表系統(tǒng)的應(yīng)用方案，但各有不足之處未能真正在我國(guó)廣泛采用。為了實(shí)現(xiàn)智能電網(wǎng)自動(dòng)抄表系統(tǒng)的真正應(yīng)用，設(shè)計(jì)了一種易于實(shí)現(xiàn)的、網(wǎng)絡(luò)開(kāi)銷小并低功耗的無(wú)線網(wǎng)絡(luò)，它采用ARM和MCU作為自動(dòng)抄表系統(tǒng)的無(wú)線集中器硬件平臺(tái)，并搭配Sub-GHz的射頻收發(fā)模塊，集中器與節(jié)點(diǎn)設(shè)備之間采用自定義協(xié)議的自動(dòng)組網(wǎng)形式， 可實(shí)現(xiàn)50個(gè)節(jié)點(diǎn)自動(dòng)靈活組網(wǎng)，而且網(wǎng)絡(luò)開(kāi)銷小只占用4 k存儲(chǔ)空間。整個(gè)系統(tǒng)具有實(shí)用性和應(yīng)用性強(qiáng)的特點(diǎn)。
標(biāo)簽： 自動(dòng)抄表 低功耗 無(wú)線 網(wǎng)絡(luò)設(shè)計(jì)
上傳時(shí)間： 2013-10-17
上傳用戶：fqscfqj
糧食安全一直是人民生活重點(diǎn)關(guān)注的話題，在糧食的儲(chǔ)備過(guò)程中，對(duì)糧食的溫濕度以及蟲(chóng)害等的監(jiān)測(cè)是保持糧食安全的重要措施。文中設(shè)計(jì)了一個(gè)通過(guò)采用Sub-G Hz頻段和CDMA技術(shù)進(jìn)行融合的糧情監(jiān)測(cè)系統(tǒng)，系統(tǒng)將物聯(lián)網(wǎng)與互聯(lián)網(wǎng)聯(lián)合起來(lái)，將采集到的數(shù)據(jù)通過(guò)CDMA網(wǎng)絡(luò)傳輸?shù)竭h(yuǎn)端的PC上，然后通過(guò)上位機(jī)對(duì)數(shù)據(jù)分析后進(jìn)行相應(yīng)的處理，從而實(shí)現(xiàn)對(duì)糧食遠(yuǎn)程的監(jiān)測(cè)與控制。該系統(tǒng)具有傳輸距離遠(yuǎn)、成本低和低功耗等特點(diǎn)，具有良好的應(yīng)用前景。
標(biāo)簽： 無(wú)線傳感器網(wǎng)絡(luò) 監(jiān)測(cè)系統(tǒng)
上傳時(shí)間： 2013-12-24
上傳用戶：taiyang250072
多遠(yuǎn)程二極管溫度傳感器-Design Considerations for pc thermal management Multiple RDTS (remote diode temperature sensing) provides the most accurate method of sensing an IC’s junction temperature. It overcomes thermal gradient and placement issues encountered when trying to place external sensors. PCB component count decreases when using a device that provides multiple inputs.Better temperature sensing improves product performance and reliability. Disk drive data integrity suffers at elevated temperatures. IBM published an article stating that a 5°C rise in operating temperature causes a 15% increase in the drive’s failure rate. The overall performance of a system can be improved by providing a more accurate temperature measurement of the most critical devices allowing them to run just a few degrees hotter.The LM83 directly senses its own temperature and the temperature of three external PN junctions. One is dedicated to the CPU of choice, the other two go to other parts of your system that need thermal monitoring such as the disk drive or graphics chip. The SMBus-compatible LM83 supports SMBus timeout and logic levels. The LM83 has two interrupt outputs; one for user-programmable limits and WATCHDOG capability (INT), the other is a Critical Temperature Alarm output (T_CRIT_A) for system power supply shutdown.
標(biāo)簽： Considerat Design 遠(yuǎn)程 二極管
上傳時(shí)間： 2014-12-21
上傳用戶：ljd123456
With the Altera Nios II embedded processor, you as the system designercan accelerate time-critical software algorithms by adding custominstructions to the Nios II processor instruction set. Using custominstructions, you can reduce a complex sequence of standard instructionsto a single instruction implemented in hardware. You can use this featurefor a variety of applications, for example, to optimize software innerloops for digital signal processing (DSP), packet header processing, andcomputation-intensive applications. The Nios II configuration wizard,part of the Quartus® II software’s SOPC Builder, provides a graphicaluser interface (GUI) used to add up to 256 custom instructions to theNios II processor
上傳時(shí)間： 2013-11-07
上傳用戶：swing
The CC1101 is a low-cost sub- 1 GHztransceiver designed for very low-powerwireless applications. The circuit is mainlyintended for the ISM (Industrial, Scientific andMedical) and SRD (Short Range Device)frequency bands at 315, 433, 868, and 915MHz, but can easily be programmed foroperation at other frequencies in the 300-348MHz, 387-464 MHz and 779-928 MHz bands.CC1101 is an improved and code compatibleversion of the CC1100 RF transceiver. Themain improvements on the CC1101 include:
標(biāo)簽： 1110 CC 片上系統(tǒng) 方案
上傳時(shí)間： 2013-11-12
上傳用戶：363186
The LPC2292/2294 microcontrollers are based on a 16/32-bit ARM7TDMI-S CPU with real-time emulation and embedded trace support, together with 256 kB of embedded high-speed flash memory. A 128-bit wide memory interface and a unique accelerator architecture enable 32-bit code execution at the maximum clock rate. For critical code size applications, the alternative 16-bit Thumb mode reduces code by more than 30 pct with minimal performance penalty. With their 144-pin package, low power consumption, various 32-bit timers, 8-channel 10-bit ADC, 2/4 (LPC2294) advanced CAN channels, PWM channels and up to nine external interrupt pins these microcontrollers are particularly suitable for automotive and industrial control applications as well as medical systems and fault-tolerant maintenance buses. The number of available fast GPIOs ranges from 76 (with external memory) through 112 (single-chip). With a wide range of additional serial communications interfaces, they are also suited for communication gateways and protocol converters as well as many other general-purpose applications. Remark: Throughout the data sheet, the term LPC2292/2294 will apply to devices with and without the /00 or /01 suffix. The suffixes /00 and /01 will be used to differentiate from other devices only when necessary.
標(biāo)簽： lpc datasheet 2292 2294
上傳時(shí)間： 2014-12-30
上傳用戶：aysyzxzm
Abstract: High-speed and low-speed data converters serve critical functions in modern broadband mobile radios. This application note outlines how todetermine high-speed data converter performance requirements in baseband sampling radio architectures. Also, system partition strategies andadvantages are outlined when considering a high-speed analog front-end (AFE) solution.
標(biāo)簽： AFE 移動(dòng) 無(wú)線終端 導(dǎo)航
上傳時(shí)間： 2013-11-02
上傳用戶：jjj0202
Abstract: This application note helps system designers choose the correct external components for use with the MAX16948 dualremote antenna LDO/switch, thus ensuring that automobile-regulated phantom antenna supply and output-current-monitoring circuitrymeet performance objectives. An electronic calculator is provided that helps specify the critical external components for theMAX16948, thus reducing design time. The calculator also determines the device's analog output voltage, output current-limitthreshold, and output current-sensing accuracies. The calculator includes new automatic Step By Step feature that assists designerswith component choice. To use the new automatic feature, click on the Step By Step button relative to the desired section.
上傳時(shí)間： 2013-11-04
上傳用戶：lhll918
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