ANALOG INPUT BANDWIDTH is a measure of the frequencyat which the reconstructed output fundamental drops3 dB below its low frequency value for a full scale input. Thetest is performed with fIN equal to 100 kHz plus integer multiplesof fCLK. The input frequency at which the output is −3dB relative to the low frequency input signal is the full powerbandwidth.APERTURE JITTER is the variation in aperture delay fromsample to sample. Aperture jitter shows up as input noise.APERTURE DELAY See Sampling Delay.BOTTOM OFFSET is the difference between the input voltagethat just causes the output code to transition to the firstcode and the negative reference voltage. Bottom Offset isdefined as EOB = VZT–VRB, where VZT is the first code transitioninput voltage and VRB is the lower reference voltage.Note that this is different from the normal Zero Scale Error.CONVERSION LATENCY See PIPELINE DELAY.CONVERSION TIME is the time required for a completemeasurement by an analog-to-digital converter. Since theConversion Time does not include acquisition time, multiplexerset up time, or other elements of a complete conversioncycle, the conversion time may be less than theThroughput Time.DC COMMON-MODE ERROR is a specification which appliesto ADCs with differential inputs. It is the change in theoutput code that occurs when the analog voltages on the twoinputs are changed by an equal amount. It is usually expressed in LSBs.
標(biāo)簽： Converter Defi ADC 轉(zhuǎn)換器
上傳時(shí)間： 2013-11-12
上傳用戶：pans0ul
針對(duì)小電流接地故障診斷難的問(wèn)題，設(shè)計(jì)了一個(gè)基于零序電流、零序電壓的實(shí)時(shí)檢測(cè)系統(tǒng)，對(duì)供電系統(tǒng)進(jìn)行檢測(cè)并對(duì)故障線路進(jìn)行選線。采用了多任務(wù)、可移植、可裁剪的嵌入式操作系統(tǒng)μC/OS-II。為防止中性點(diǎn)帶補(bǔ)償系統(tǒng)對(duì)于故障線路的過(guò)補(bǔ)償影響，系統(tǒng)還加入了補(bǔ)償零序?qū)Ъ{判據(jù)對(duì)這種接地情況下的故障進(jìn)行檢測(cè)。選線系統(tǒng)采用零序電壓觸發(fā)方式，既提高了實(shí)時(shí)性，也增大了選線的準(zhǔn)確性。
標(biāo)簽： 小電流 單相接地 接地系統(tǒng) 選線裝置
上傳時(shí)間： 2014-01-18
上傳用戶：海陸空653
基于嵌入式實(shí)時(shí)操作系統(tǒng)的OBD-II診斷協(xié)議框架，以Cortex-M3為內(nèi)核，采用uc/os II操作系統(tǒng)實(shí)現(xiàn)了ISO15765協(xié)議，成功通過(guò)CAN總線讀取了車(chē)輛的OBD-II系統(tǒng)數(shù)據(jù)，通過(guò)上位機(jī)監(jiān)控窗口，能實(shí)時(shí)檢查汽車(chē)故障碼與汽車(chē)傳感器數(shù)據(jù)。可在此基礎(chǔ)上評(píng)價(jià)汽車(chē)健康狀況，并可對(duì)故障及早預(yù)防，降低行車(chē)成本，提供行車(chē)安全性；本設(shè)計(jì)充分考慮中國(guó)汽車(chē)市場(chǎng)主流總線發(fā)展的情況，提供了在復(fù)雜的車(chē)載環(huán)境下遠(yuǎn)程車(chē)載診斷設(shè)備的解決方案。
標(biāo)簽： CORTEX-M 車(chē)載 預(yù)警系統(tǒng)
上傳時(shí)間： 2013-11-19
上傳用戶：愛(ài)死愛(ài)死
特點(diǎn)(FEATURES) 精確度0.1%滿刻度 (Accuracy 0.1%F.S.) 可作各式數(shù)學(xué)演算式功能如:A+B/A-B/AxB/A/B/A&B(Hi or Lo)/|A| (Math functioA+B/A-B/AxB/A/B/A&B(Hi&Lo)/|A|/etc.....) 16 BIT 類比輸出功能(16 bit DAC isolating analog output function) 輸入/輸出1/輸出2絕緣耐壓2仟伏特/1分鐘(Dielectric strength 2KVac/1min. (input/output1/output2/power)) 寬范圍交直流兩用電源設(shè)計(jì)(Wide input range for auxiliary power) 尺寸小,穩(wěn)定性高(Dimension small and High stability)
標(biāo)簽： 微電腦 數(shù)學(xué)演算 輸出 隔離傳送器
上傳時(shí)間： 2013-11-24
上傳用戶：541657925
Occasionally, we are tasked with designing circuitry for aspecific purpose. The request may have customer originsor it may be an in-house requirement. Alternately, a circuitmay be developed because its possibility is simply tooattractive to ignore1. Over time, these circuits accumulate,encompassing a wide and useful body of proven capabilities.They also represent substantial effort. These considerationsmake publication an almost obligatory propositionand, as such, a group of circuits is presented here. This isnot the first time we have displayed such wares and, giventhe encouraging reader response, it will not be the last2.Eighteen circuits are included in this latest effort, roughlyarranged in the categories given in this publication’s title.They appear at the next paragraph.
標(biāo)簽： 信號(hào)源 調(diào)節(jié)器 電源 電路分析
上傳時(shí)間： 2013-11-12
上傳用戶：012345
For a variety of reasons, it is desirable to charge batteriesas rapidly as possible. At the same time, overchargingmust be limited to prolong battery life. Such limitation ofovercharging depends on factors such as the choice ofcharge termination technique and the use of multi-rate/multi-stage charging schemes. The majority of batterycharger ICs available today lock the user into one fixedcharging regimen, with at best a limited number ofcustomization options to suit a variety of application needsor battery types. The LTC®1325 addresses these shortcomingsby providing the user with all the functionalblocks needed to implement a simple but highly flexiblebattery charger (see Figure 1) which not only addressesthe issue of charging batteries but also those of batteryconditioning and capacity monitoring.
上傳時(shí)間： 2013-10-19
上傳用戶：royzhangsz
設(shè)計(jì)了一個(gè)基于單片機(jī)的轎車(chē)車(chē)內(nèi)一氧化碳濃度測(cè)控功能的系統(tǒng)。該系統(tǒng)以16位高性能單片機(jī)SPCE061A為控制核心，采用高精度敏感元件MQ-7，集成運(yùn)算放大器INA128進(jìn)行信號(hào)調(diào)理，并引入了實(shí)時(shí)操作系統(tǒng)μC/OS-II進(jìn)行任務(wù)管理。實(shí)驗(yàn)表明：系統(tǒng)實(shí)現(xiàn)了轎車(chē)空調(diào)運(yùn)行時(shí)一氧化碳?xì)怏w的實(shí)時(shí)監(jiān)控，CO濃度不超過(guò)300 ppm，同時(shí)具有溫度測(cè)量功能，便于進(jìn)行空調(diào)操作，參數(shù)測(cè)量準(zhǔn)確，為保證轎車(chē)內(nèi)人員安全提供了可靠方案。
標(biāo)簽： 單片機(jī) 轎車(chē) 氧化 氣體
上傳時(shí)間： 2013-12-04
上傳用戶：縹緲
和其他的μC/OS-II移植文件類似，設(shè)備代碼由以下3 到5 個(gè)文件組成的。 Os_cpu.h Os_cpu_c.c Os_cpu_a.s90 (該文件僅在ICC 編譯器中使用) Os_cpu_i.s90 (該文件僅在ICC 編譯器中使用) Os_dbg.c Os_dbg.c 僅需在IAR 工程中使用。 3.01 OS_CPU.H 3.01.01 OS_CPU.H, macros for ‘externals’ Listing 3-1, OS_CPU.H, 外部宏（macros for ‘externals’） #ifdef OS_CPU_GLOBALS #define OS_CPU_EXT #else #define OS_CPU_EXT extern #endif
標(biāo)簽： ATMEGA ucos 128L 128
上傳時(shí)間： 2013-11-25
上傳用戶：zhaistone
HIGH SPEED 8051 μC CORE - Pipe-lined Instruction Architecture; Executes 70% of Instructions in 1 or 2 System Clocks - Up to 25MIPS Throughput with 25MHz System Clock - 22 Vectored Interrupt Sources MEMORY - 4352 Bytes Internal Data RAM (256 + 4k) - 64k Bytes In-System Programmable FLASH Program Memory - External Parallel Data Memory Interface – up to 5Mbytes/sec DIGITAL PERIPHERALS - 64 Port I/O; All are 5V tolerant - Hardware SMBusTM (I2CTM Compatible), SPITM, and Two UART Serial Ports Available Concurrently - Programmable 16-bit Counter/Timer Array with 5 Capture/Compare Modules - 5 General Purpose 16-bit Counter/Timers - Dedicated Watch-Dog Timer; Bi-directional Reset CLOCK SOURCES - Internal Programmable Oscillator: 2-to-16MHz - External Oscillator: Crystal, RC, C, or Clock - Real-Time Clock Mode using Timer 3 or PCA SUPPLY VOLTAGE ........................ 2.7V to 3.6V - Typical Operating Current: 10mA @ 25MHz - Multiple Power Saving Sleep and Shutdown Modes 100-Pin TQFP (64-Pin Version Available) Temperature Range: –40°C to +85°C
標(biāo)簽： C8051F020
上傳時(shí)間： 2013-10-12
上傳用戶：lalalal
a_bit equ 20h ;個(gè)位數(shù)存放處 b_bit equ 21h ;十位數(shù)存放處 temp equ 22h ;計(jì)數(shù)器寄存器 star: mov temp,#0 ;初始化計(jì)數(shù)器 stlop: acall display inc temp mov a,temp cjne a,#100,next ;=100重來(lái) mov temp,#0 next: ljmp stlop ;顯示子程序 display: mov a,temp ;將temp中的十六進(jìn)制數(shù)轉(zhuǎn)換成10進(jìn)制 mov b,#10 ;10進(jìn)制/10=10進(jìn)制 div ab mov b_bit,a ;十位在a mov a_bit,b ;個(gè)位在b mov dptr,#numtab ;指定查表啟始地址 mov r0,#4 dpl1: mov r1,#250 ;顯示1000次 dplop: mov a,a_bit ;取個(gè)位數(shù) MOVC A,@A+DPTR ;查個(gè)位數(shù)的7段代碼 mov p0,a ;送出個(gè)位的7段代碼
標(biāo)簽： 直接驅(qū)動(dòng) 數(shù)碼管 計(jì)數(shù)器 程序
上傳時(shí)間： 2013-11-06
上傳用戶：lx9076
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