-
As environmental concerns over traditional lighting increaseand the price of LEDs decreases, high power LEDsare fast becoming a popular lighting solution for offl ineapplications. In order to meet the requirements of offl inelighting—such as high power factor, high effi ciency, isolationand TRIAC dimmer compatibility—prior LED driversused many external discrete components, resulting incumbersome solutions. The LT®3799 solves complexity,space and performance problems by integrating all therequired functions for offl ine LED lighting.
標(biāo)簽：
LED
離線式
照明
上傳時(shí)間：
2013-10-13
上傳用戶：dongqiangqiang
-
In August of 1992 LTC published Application Note 49,
“Illumination Circuitry for Liquid Crystal Displays.” One
notable aspect of this event is that it generated more
response than all previous LTC application notes combined.
This level of interest, along with significant performance
advances since AN-49’s appearance, justifies
further discussion of LCD backlighting circuitry.
標(biāo)簽：
LCD
液晶
照明技術(shù)
上傳時(shí)間：
2013-11-19
上傳用戶：lanjisu111
-
This application note describes how to decode standard DTMF tones using the minimum number of external discrete components and a PIC. The two examples use a PIC which has an 8 bit timer and either a comparator or an ADC, although it can be modified for use on a PIC which has only digital I/O. The Appendices have example code for the 16C662 (with comparator) and 16F877 (using the ADC).
As the majority of the Digital Signal Processing is done in software, little is required in the way of external signal conditioning. Software techniques are used to model the individual elements of a DTMF Decoder IC.
標(biāo)簽：
Decoding
DTMF
with
PIC
上傳時(shí)間：
2013-11-21
上傳用戶：zhaoke2005
-
51單片機(jī)及其應(yīng)用:1.1.1 電子計(jì)算機(jī)的問世及其經(jīng)典結(jié)構(gòu)1946年2月15日，第一臺(tái)電子數(shù)字計(jì)算機(jī)問世，這標(biāo)志著計(jì)算機(jī)時(shí)代的到來。（CALCULATOR）ENIAC（“埃尼阿克”）◆ENIAC是電子管計(jì)算機(jī)，時(shí)鐘頻率僅有100 KHz，但能在1秒鐘的時(shí)間內(nèi)完成5000次加法運(yùn)算。◆與現(xiàn)代的計(jì)算機(jī)相比，有許多不足，但它的問世開創(chuàng)了計(jì)算機(jī)科學(xué)技術(shù)的新紀(jì)元，對(duì)人類的生產(chǎn)和生活方式產(chǎn)生了巨大的影響 。 匈牙利籍?dāng)?shù)學(xué)家馮·諾依曼在方案的設(shè)計(jì)上做出了重要的貢獻(xiàn)。1946年6月，他又提出了“程序存儲(chǔ)”和“二進(jìn)制運(yùn)算”的思想，進(jìn)一步構(gòu)建了計(jì)算機(jī)由運(yùn)算器、控制器、存儲(chǔ)器、輸入設(shè)備和輸出設(shè)備組成這一計(jì)算機(jī)的經(jīng)典結(jié)構(gòu)。（EDVAC-ELECTRONIC DISCRETE VARIABLE AUTOMATIC COMPUTER）二、微型計(jì)算機(jī)的應(yīng)用形態(tài) 從應(yīng)用形態(tài)上，微機(jī)可以分成三種：
標(biāo)簽：
51單片機(jī)
上傳時(shí)間：
2013-12-20
上傳用戶：d815185728
-
The PCA9557 is a silicon CMOS circuit which provides parallel input/output expansion for
SMBus and I2C-bus applications. The PCA9557 consists of an 8-bit input port register,
8-bit output port register, and an I2C-bus/SMBus interface. It has low current consumption
and a high-impedance open-drain output pin, IO0.
The system master can enable the PCA9557’s I/O as either input or output by writing to
the configuration register. The system master can also invert the PCA9557 inputs by
writing to the active HIGH polarity inversion register. Finally, the system master can reset
the PCA9557 in the event of a time-out by asserting a LOW in the reset input.
The power-on reset puts the registers in their default state and initializes the
I2C-bus/SMBus state machine. The RESET pin causes the same reset/initialization to
occur without de-powering the part.
標(biāo)簽：
C-bus
SMBus
reset
port
上傳時(shí)間：
2014-01-18
上傳用戶：bs2005
-
Internal Interrupts are used to respond to asynchronous requests from a certain part of themicrocontroller that needs to be serviced. Each peripheral in the TriCore as well as theBus Control Unit, the Debug Unit, the Peripheral Control Processor (PCP) and the CPUitself can generate an Interrupt Request.So what is an external Interrupt?An external Interrupt is something alike as the internal Interrupt. The difference is that anexternal Interrupt request is caused by an external event. Normally this would be a pulseon Port0 or Port1, but it can be even a signal from the input buffer of the SSC, indicatingthat a service is requested.The User’s Manual does not explain this aspect in detail so this ApNote will explain themost common form of an external Interrupt request. This ApNote will show that there is aneasy way to react on a pulse on Port0 or Port1 and to create with this impulse an InterruptService Request. Later in the second part of the document, you can find hints on how todebounce impulses to enable the use of a simple switch as the input device.Note: You will find additional information on how to setup the Interrupt System in theApNote “First steps through the TriCore Interrupt System” (AP3222xx)1. It would gobeyond the scope of this document to explain this here, but you will find selfexplanatoryexamples later on.
標(biāo)簽：
Exter
easy
work
with
上傳時(shí)間：
2013-10-27
上傳用戶：zhangyigenius
-
The #1 Step-by-Step Guide to labviewNow Completely Updated for labview 8!
Master labview 8 with the industry's friendliest, most intuitive tutorial: labview for Everyone, Third Edition. Top labview experts Jeffrey Travis and Jim Kring teach labview the easy way: through carefully explained, step-by-step examples that give you reusable code for your own projects!
This brand-new Third Edition has been fully revamped and expanded to reflect new features and techniques introduced in labview 8. You'll find two new chapters, plus dozens of new topics, including Project Explorer, AutoTool, XML, event-driven programming, error handling, regular expressions, polymorphic VIs, timed structures, advanced reporting, and much more. Certified labview Developer (CLD) candidates will find callouts linking to key objectives on NI's newest exam, making this book a more valuable study tool than ever.
Not just what to d why to do it!
Use labview to build your own virtual workbench
Master labview's foundations: wiring, creating, editing, and debugging VIs; using controls and indicators; working with data structures; and much more
Learn the "art" and best practices of effective labview development
NEW: Streamline development with labview Express VIs
NEW: Acquire data with NI-DAQmx and the labview DAQmx VIs
NEW: Discover design patterns for error handling, control structures, state machines, queued messaging, and more
NEW: Create sophisticated user interfaces with tree and tab controls, drag and drop, subpanels, and more
Whatever your application, whatever your role, whether you've used labview or not, labview for Everyone, Third Edition is the fastest, easiest way to get the results you're after!
標(biāo)簽：
Everyone
LabVIEW
for
英文
上傳時(shí)間：
2013-10-14
上傳用戶：shawvi
-
1.增加的設(shè)備支持：
Atmel AT91SAM9Rxx
Cirrus Logic CS7401xx-IQZ
Luminary Micro LM3S576x, LM3S5752, LM3S5747, LM3S573x, LM3S5662, LM3S5652, LM3S5632, LM3S3759, LM3S3749, and LM3S3739
NXP LPC32XX and LPC2460
STMicroelectronics STR912FAZ4X, STR912FAW4X, STR911FAW4X, STR911FAM4X, STR910FAW32, and STR910FAZ32
2.修改了NXP LPC23XX/24XX的頭文件庫
3.增加了ST-LINK II的調(diào)試支持
4.增加了對(duì)Cortex-M3 內(nèi)核芯片的RTX Event Viewer 的支持
5.增加了MCBSTM32: STM32 FLASH OPTION BYTES PROGRAMMING
6.增加了ULINK2對(duì)Cortex-M3的SWV功能的調(diào)試
7.增強(qiáng)了使用GNU在MDK下調(diào)試M1,M3,ARM7,ARM9的調(diào)試功能（ Using μVision with CodeSourcery GNU ARM Toolchain.）
8.增加了大量經(jīng)典開發(fā)板例程
Boards目錄列表：
├─Embest 深圳市英蓓特公司開發(fā)板例程
│ ├─AT91EB40X-40008
│ ├─S3CEB2410
│ ├─ATEBSAM7S
│ ├─LPC22EB06-I
│ ├─LPCEB2000-A
│ ├─LPCEB2000-B
│ ├─LPCEB2000-S
│ ├─str710
│ ├─str711
│ ├─str730
│ ├─str750
│ ├─STR912
│ ├─STM32V100
│ ├─STM32R100
│ ├─ATEB9200
├─ADI ADI半導(dǎo)體的芯片例程
│ ├─ADuC702X
│ └─ADuC712x
├─Atmel Atmel半導(dǎo)體的芯片例程
│ ├─AT91RM9200-EK
│ ├─AT91SAM7A3-EK
│ ├─AT91SAM7S-EK
│ ├─AT91SAM7SE-EK
│ ├─AT91SAM7X-EK
│ ├─AT91SAM9260-EK
│ ├─AT91SAM9261-EK
│ ├─AT91SAM9263-EK
├─Keil Keil公司的開發(fā)板例程
│ ├─MCB2100
│ ├─MCB2103
│ ├─MCB2130
│ ├─MCB2140
│ ├─MCB2300
│ ├─MCB2400
│ ├─MCB2900
│ ├─MCBLM3S
│ ├─MCBSTM32
│ ├─MCBSTR7
│ ├─MCBSTR730
│ ├─MCBSTR750
│ └─MCBSTR9
├─Luminary Luminary半導(dǎo)體公司的芯片例程
│ ├─ek-lm3s1968
│ ├─ek-lm3s3748
│ ├─ek-lm3s3768
│ ├─dk-lm3s101
│ ├─dk-lm3s102
│ ├─dk-lm3s301
│ ├─dk-lm3s801
│ ├─dk-lm3s811
│ ├─dk-lm3s815
│ ├─dk-lm3s817
│ ├─dk-lm3s818
│ ├─dk-lm3s828
│ ├─ek-lm3s2965
│ ├─ek-lm3s6965
│ ├─ek-lm3s811
│ └─ek-lm3s8962
├─NXP NXP半導(dǎo)體公司的芯片例程
│ ├─LH79524
│ ├─LH7A404
│ └─SJA2510
├─OKI OKI半導(dǎo)體公司的芯片例程
│ ├─ML674000
│ ├─ML67Q4003
│ ├─ML67Q4051
│ ├─ML67Q4061
│ ├─ML67Q5003
│ └─ML69Q6203
├─Samsung Samsung半導(dǎo)體公司的芯片例程
│ ├─S3C2440
│ ├─S3C44001
│ └─S3F4A0K
├─ST ST半導(dǎo)體公司的芯片例程
│ ├─CQ-STARM2
│ ├─EK-STM32F
│ ├─STM32F10X_EVAL
│ ├─STR710
│ ├─STR730
│ ├─STR750
│ ├─STR910
│ └─STR9_DONGLE
├─TI TI半導(dǎo)體公司的芯片例程
│ ├─TMS470R1A256
│ └─TMS470R1B1M
├─Winbond Winbond半導(dǎo)體公司的芯片例程
│ └─W90P710
└─ ...
標(biāo)簽：
realview
mdk
3.2
上傳時(shí)間：
2013-10-13
上傳用戶：zhangliming420
-
This example shows how to update at regulate period the WWDG counter using theEarly Wakeup interrupt (EWI).
The WWDG timeout is set to 262ms, refresh window set to 41h and the EWI isenabled. When the WWDG counter reaches 40h the EWI is generated and in the WWDGISR the counter is refreshed to prevent a WWDG reset and led connected to PC.07is toggled.The EXTI line9 is connected to PB.09 pin and configured to generate an interrupton falling edge.In the NVIC, EXTI line9 to 5 interrupt vector is enabled with priority equal to 0and the WWDG interrupt vector is enabled with priority equal to 1 (EXTI IT > WWDG IT).
The EXTI Line9 will be used to simulate a software failure: once the EXTI line9event occurs (by pressing Key push-button on EVAL board) the correspondent interruptis served, in the ISR the led connected to PC.07 is turned off and the EXTI line9pending bit is not cleared. So the CPU will execute indefinitely EXTI line9 ISR andthe WWDG ISR will never be entered(WWDG counter not updated). As result, when theWWDG counter falls to 3Fh the WWDG reset occurs.If the EXTI line9 event don抰 occurs the WWDG counter is indefinitely refreshed inthe WWDG ISR which prevent from WWDG reset.
If the WWDG reset is generated, after resuming from reset a led connected to PC.06is turned on.
In this example the system is clocked by the HSE(8MHz).
標(biāo)簽：
V100
STM
100
32V
上傳時(shí)間：
2013-11-11
上傳用戶：gundamwzc
-
通過以太網(wǎng)遠(yuǎn)程配置Nios II 處理器 應(yīng)用筆記
Firmware in embedded hardware systems is frequently updated over the Ethernet. For
embedded systems that comprise a discrete microprocessor and the devices it controls, the
firmware is the software image run by the microprocessor. When the embedded system
includes an FPGA, firmware updates include updates of the hardware image on the FPGA. If
the FPGA includes a Nios® II soft processor, you can upgrade both the Nios II processor—as
part of the FPGA image—and the software that the Nios II processor runs, in a single remote
configuration session.
標(biāo)簽：
Nios
遠(yuǎn)程
處理器
應(yīng)用筆記
上傳時(shí)間：
2013-11-22
上傳用戶：chaisz
