針對小電流接地故障診斷難的問題,設計了一個基于零序電流、零序電壓的實時檢測系統,對供電系統進行檢測并對故障線路進行選線。采用了多任務、可移植、可裁剪的嵌入式操作系統μC/OS-II。為防止中性點帶補償系統對于故障線路的過補償影響,系統還加入了補償零序導納判據對這種接地情況下的故障進行檢測。選線系統采用零序電壓觸發方式,既提高了實時性,也增大了選線的準確性。
上傳時間: 2014-01-18
上傳用戶:海陸空653
基于嵌入式實時操作系統的OBD-II診斷協議框架,以Cortex-M3為內核,采用uc/os II操作系統實現了ISO15765協議,成功通過CAN總線讀取了車輛的OBD-II系統數據,通過上位機監控窗口,能實時檢查汽車故障碼與汽車傳感器數據??稍诖嘶A上評價汽車健康狀況,并可對故障及早預防,降低行車成本,提供行車安全性;本設計充分考慮中國汽車市場主流總線發展的情況,提供了在復雜的車載環境下遠程車載診斷設備的解決方案。
上傳時間: 2013-11-19
上傳用戶:愛死愛死
特點(FEATURES) 精確度0.1%滿刻度 (Accuracy 0.1%F.S.) 可作各式數學演算式功能如: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計(Wide input range for auxiliary power) 尺寸小,穩定性高(Dimension small and High stability)
上傳時間: 2013-11-24
上傳用戶:541657925
Linear Technology offers a variety of devices that simplifyconverting power from a USB cable, but the LTC®3455represents the highest level of functional integration yet. The LTC3455 seamlessly manages power flowbetween an AC adapter, USB cable and Li-ion battery,while complying with USB power standards, all from a4mm × 4mm QFN package. In addtion, two high efficiencysynchronous buck converters generate low voltage railswhich most USB-powered peripherals require. TheLTC3455 also provides power-on reset signals for themicroprocessor, a Hot SwapTM output for poweringmemory cards as well as an uncommitted gain blocksuitable for use as a low-battery comparator or an LDOcontroller. The PCB real estate required for the entire USBpower control circuit and two DC/DC converters is only225mm2.
上傳時間: 2013-11-02
上傳用戶:名爵少年
設計了一個基于單片機的轎車車內一氧化碳濃度測控功能的系統。該系統以16位高性能單片機SPCE061A為控制核心,采用高精度敏感元件MQ-7,集成運算放大器INA128進行信號調理,并引入了實時操作系統μC/OS-II進行任務管理。實驗表明:系統實現了轎車空調運行時一氧化碳氣體的實時監控,CO濃度不超過300 ppm,同時具有溫度測量功能,便于進行空調操作,參數測量準確,為保證轎車內人員安全提供了可靠方案。
上傳時間: 2013-12-04
上傳用戶:縹緲
和其他的μC/OS-II移植文件類似,設備代碼由以下3 到5 個文件組成的。 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
上傳時間: 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
標簽: C8051F020
上傳時間: 2013-10-12
上傳用戶:lalalal
The MAX9257/MAX9258 programmable serializer/deserializer (SerDes) devices transfer both video data and control signals over the same twisted-pair cable. However, control data can only be transmitted during the vertical blank time, which is indicated by the control-channel-enabled output (CCEN) signal. The electronic control unit (ECU) firmware designer needs to know how quickly to respond to the CCEN signal before it times out and how to calculate this duration. This application note describes how to calculate the duration of the CCEN for the MAX9257/MAX9258 SerDes chipset. The calculation is based on STO timeout, clock frequency, and UART bit timing. The CCEN duration is programmable and can be closed if not in use.
上傳時間: 2014-01-24
上傳用戶:xingisme
a_bit equ 20h ;個位數存放處 b_bit equ 21h ;十位數存放處 temp equ 22h ;計數器寄存器 star: mov temp,#0 ;初始化計數器 stlop: acall display inc temp mov a,temp cjne a,#100,next ;=100重來 mov temp,#0 next: ljmp stlop ;顯示子程序 display: mov a,temp ;將temp中的十六進制數轉換成10進制 mov b,#10 ;10進制/10=10進制 div ab mov b_bit,a ;十位在a mov a_bit,b ;個位在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 ;取個位數 MOVC A,@A+DPTR ;查個位數的7段代碼 mov p0,a ;送出個位的7段代碼
上傳時間: 2013-11-06
上傳用戶:lx9076
目錄: 1. Character Type Functions - 字符類型函數 2. Standard C Input/Output Functions - 標準輸入輸出函數 3. Standard Library Functions - 標準庫和內存分配函數 4. Mathematical Functions - 數學函數 5. String Functions - 字符串函數 6. BCD Conversion Functions - BCD 轉換函數 7. Memory Access Functions - 存儲器訪問函數 8. Delay Functions - 延時函數 9. LCD Functions - LCD函數 10. LCD Functions for displays with 4x40 characters - 4×40 字符型LCD函數 11. LCD Functions for displays connected in 8 bit memory mapped mode -以8 位外部存儲 器模式接口的LCD顯示函數 12. I2C Bus Functions - I2C 總線函數 13. National Semiconductor LM75 Temperature Sensor Functions - LM75 溫度傳感器函數 14. Dallas Semiconductor DS1621 Thermometer/Thermostat Functions - DS1621 溫度計函 數 15. Philips PCF8563 Real Time Clock Functions - PCF8563 實時時鐘函數 16. Philips PCF8583 Real Time Clock Functions - PCF8583 實時時鐘函數 17. Dallas Semiconductor DS1302 Real Time Clock Functions - DS1302 實時時鐘函數 18. Dallas Semiconductor DS1307 Real Time Clock Functions - DS1307 實時時鐘函數 19. 1 Wire Protocol Functions - 單線通訊協議函數 20. Dallas Semiconductor DS1820/DS1822 Temperature Sensors Functions - DS1820/1822 溫度傳感器函數 21. SPI Functions - SPI 函數 22. Power Management Functions - 電源管理函數 23. Gray Code Conversion Functions - 格雷碼轉換函數
上傳時間: 2013-10-22
上傳用戶:歸海惜雪