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MAX6951-LED drive and its application
digitalshare | 07 May, 2012 04:10
Light emitting diode (LED) in such areas as industrial controllers and meters, medical devices and home appliances have a wide range of applications. Traditional LED display driver with 74HC573 and 74LS47 logic device, use the device more, consume more microprocessors I/O port and a larger Board area, especially LED a large number of cases, these shortcomings Nikon Coolpix S220 Battery Charger are particularly prominent. In order to overcome these shortcomings, LED display serial interface drives came into being, MAX6950/MAX6951 belonging to the class of the Maxim company introduced drive, less its input pin, driving ability, and the decoder is integrated and brightness controller. (More)
From a small Board area provide 4 voltage regulator-rail
digitalshare | 26 April, 2012 03:43
Four-channel output LTC3544B is a single-chip buck regulator, to above the 90% efficiency and provides 4 independent voltage power rail. 4 rated maximum output current of 300mA of output, 200mA, 100mA and 200mA. Under light load current, pulse jump operations to maintain the high efficiency and low output voltage ripple. Input voltage range of 2.25V NM, and the output voltage level may range from 0.8V to VIN's an independent set. Space savings, features include a 3mm of LTC3544B x 3mm, 16-pin QFN package and 2.25MHz of a fixed switching frequency (which made it possible to use a minimal number of smaller, surface mount external components).
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Battery management electronics how to increase the battery safety
digitalshare | 11 April, 2012 04:49
For the lithium-ion battery pack manufacturers, building secure and reliable products for battery-powered system is vital. Battery pack battery-management circuits can monitor the operational status of lithium-ion batteries, including the impedance of the battery, temperature, voltage, charge and discharge currents, charge status, system provides details of the remaining running time and the battery health information to ensure that the system made the right decision. In addition, in order to improve the safety performance of the battery, even if only a failure occurs, such as overcurrent, short circuit, modules and battery packs such as high voltage, high temperature, system will also shut down two and lithium-ion battery back in series (back-to-back) protection MOSFET, disconnect the battery unit. Tracking technology based on impedance of battery management unit (BMU) throughout the cell cycle monitoring unit of impedance and voltage imbalance, and has the potential to detect tiny battery short circuit (micro-short) to prevent battery units cause fires and explosions. (More)
MHz synchronous switching battery charger application
digitalshare | 22 March, 2012 03:34
Adapter DC voltage: 12 V
Catamaran lithium-ion battery pack: 4.2 V / battery, 1900mAh / Battery
Pre-charge current: IPRE-CHG = 133 mA
Fast charge current: ICHG = 1.33 A,
Charging time limit: tCHG = 5-hour
Begin charging temperature range: T = 0 ° C ~ 45 C,
Extremely important due to the size of the battery charger for portable devices and therefore require the smallest possible output inductor. For a given inductor ripple current, the required inductance is given by:
(More)
Positive and negative pulse charger
digitalshare | 08 March, 2012 03:18
In recent years, lead-acid batteries due to their low cost, high capacity, low price and was widely used. But if used incorrectly, its life will be greatly reduced, many factors affect the life of lead-acid batteries, charging is one of the main factors. As people continued to deepen the study of the theory of fast charging, the increasingly widespread application of power electronics technology, lead-acid storage battery fast charge technology has also been further improved and entered the practical stage of the condition and possible. Lead-acid battery fast charge circuit described here to Ma Sisan theoretical basis for the law, while speeding up the battery's chemical reaction speed, shortening the battery reaches full charge State of the time, improved charging time; on the other hand guarantee a battery negative positive side to absorb the oxygen, avoiding the polarization of the cell. Better implementation of the lead-acid battery fast charging and removal of polarization, extending the life of the battery. (More)
Intelligent digital power has improved monitoring features
digitalshare | 23 February, 2012 03:00
Although, many simulation of the power system can effectively monitor and control power to meet the demands of today's electronic system, but for a wider range of loads and more synchronized low output voltage, as well as a variety of power management, achieve greater efficiencies, advantages of digital power is even able to play it. The adaptability and flexibility of digital power supply to provide intelligent, direct monitoring, and the ability to adapt to the conditions of system, to meet the complex power requirements. In addition, digital power supply system reliability of remote diagnostics can also ensure continuous, fault management, includes overcurrent protection and avoid downtime. (More)
Philip Bloom closer EOS C300
digitalshare | 08 February, 2012 03:16
Canon Philip Bloom first declared themselves not charged fees. He hoped that in the future could use to do a test. As usual, fair and impartial.
Scarlet and C300 series of publications. Both products have their own characteristics, the cameras are not cheap. C300 publication, he said nothing special. Looks like C300, but it's still about three aspects of it: 8bit, 720P, slow-motion and $20K price. This was discouraged by many independent film.
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Beware of the summer heat approaching the car's "dangerous goods"
digitalshare | 26 January, 2012 06:27
Summer heat, the car ignition, puncture accidents also will increase. Doing routine maintenance in the car while also pay attention to small details. Because maybe a small thing, can cause incalculable damage and injury. For example, put the car in summer must pay attention to things, some things can not be placed in the car. (More)
Maxim launches TacTouch piezoelectric tactile feedback controllers
digitalshare | 06 January, 2012 03:32
Maxim launches industry's first fully integrated programmable HPC (tactile feedback for piezoelectric controller) MAX11835*, driving single-layer and multilayer incentive. MAX11835 innovative haptic feedback programmes, to provide users with enhanced on the touch screen, true "touch" experience. (More)
Lend you a pair of keen eye for Hyper-performance DV selection guide
digitalshare | 28 December, 2011 02:43
Household cameras have come out as early as 20 years ago, but high above the price so that it can only be a plaything of special populations, most of the average user can only sigh. In recent years, the camera from the original was about more than 20,000 yuan to now appear below $ 3,000 products, DV products gradually changed the image of high-end digital products, as a mass popular consumer digital products. (More)
Application of biometric technology in car security
digitalshare | 09 December, 2011 03:07
Grand Prix is the more intense stimulation of competition in various sports events often attract a lot of fans of audience participation. At the same time, long-distance saiduan competition set sports competitions, leisure, communication, play, shop and other commercial activities in one. Therefore, carrying the event venue is bound to accept the huge crowd, including spectators, athletes, administrators, service personnel, and these groups identity are extremely complex and is constantly moving. How to validation these personnel by holding of votes card and documents is effective of; how to timely track and query so huge number of personnel is entered to specifies regional, dang personnel errors into or (More)
Digital technology showing various video compression standards review
digitalshare | 28 November, 2011 03:06
Computer technology always carries on, there is the emergence of various standards to the inevitable, we'll briefly review, several of today's popular video standard.
MPEG
The full name of moving picture experts group MPEG (Moving Picture Experts Group). MPEG compression standard is for movement image and design of, and basic method is--in units time within collection and save first frame information, then on only storage remaining frame relative first frame occurred changes of JVC GR-AX82 Battery Charger part, to reached compression of purpose, MPEG compression standard may implementation frame Zhijian of compression, its average compression than may up 50:1, compression rate than higher, and and has unified of format, compatibility good.
MPEG-2 is the representative of the following MPEG-1 a VCD and MP3-MPEG-1 after a successful get a positive, launched in 1994 by the compression standard, to implement video/audio services and possibilities of application interoperability. MPEG-2 standard is for SDTV and HDTV compression schemes in various application and system requirements details, coding rate 3 megabits per second ~100 megabits, formal specification of the standard in ISO/IEC13818. MPEG-2 is not a simple upgrade MPEG-1, MPEG-2 systems and transmission requirement for a more detailed and further perfected, it is especially suitable for broadcast-quality coding and transmission of digital television, and was recognized as a coding standard for SDTV and HDTV, existing DVD discs is MPEG-2 compression standard.
DVD video format as we are most familiar with, it also uses MPEG2 video compression, but this does not mean playing software can play DVD HDTV. Because the DVD MPEG2-PS format, either MPEG2 Program Stream, it is used for Nikon Coolpix S4000 Battery Charger storing fixed length program. HDTV is a MPEG2-TS format, either MPEG2 Transport Stream, is a video streaming format, mainly for real-time transmission program. So you want to play HDTV video sources, requires not only the player MPEG2-TS decoding plugin, but they must also have a dedicated HDTV separator. From the current situation, isolation and decoder for a wide range of players, HDTV, playback is mixed, consume resources also varies, which also created certain difficulties for later evaluation to us, we will talk about later.
Generally uses. mpg,. TP and. TS to HDTV file suffix is MPEG-2 compression.
MPEG4
In recent years, MPEG-4 quietly in the market, and the latest product of DV (digital video cameras), PDA, mobile phone, that VOD, karaoke OK, monitoring system, such as on the product description, appeared one after another "MPEG-4" Word, one replaces the MPEG-2 market war seems to be fired.
MPEG-4 after the audit in 2000 with the ITU and ISO international standards organization, became one of the international standard for video compression. Video compression MPEG-4 compression uses a MPEG-4 way, coupled with MPEG-1 audio compression (MP3), and generated close to DVD quality image, sound quality approaching CD, but has a higher compression ratio. In the past "weaken" over the MPEG-2 MPEG-4 in addition to the amazing data compression ratio, after MPEG-4 the compressed file size can reach MPEG-2 one-third, and still maintains a very good sound quality and Panasonic Lumix DMC-FZ28 Battery Charger picture quality. You can get the best image quality with a minimum amount of data, therefore meets the needs of low-bit-rate applications.
But MPEG-4 standards are derived from various specifications, such as DivX, XviD, and more, business groups representing different interests and some support of free technology groups competing for shared resources results led to MPEG-4 specifications compatibility is very poor.
On MPEG-4 for HDTV-Rip, MPEG-4 directly on the HDTV video compression is rare, HDTV-Rip MPEG-4 as it relates to, the native of HDTV files according to the scaled down to a certain size in order to reduce the size of text and to facilitate transport and effects for no less than DVD effect, to seek a balance of effects and file size.
As said above due to disputes in all business groups, MPEG-4 now standards confusing, mainly based on common standards for MPEG-4 DivX and XviD, and the version number of the two, and general readers not easy respectively, basically you have the latest version of the DivX and XviD can guarantee backward compatibility to older.
MPEG-4 of compressed video file video file name suffix for. AVI, it is easy to be confused with Microsoft's AVI format, directly from the extension name is not easy to identify, through the decoder to identify only.
○ WMV-HD
WMV-HD was founded by software giant Microsoft, a video compression format. Compress rate even higher than the MPEG-2 standard, is also a 2 hour of HDTV programming, if you use MPEG-2 can only compress to 30GB, using a higher compression ratio, WMV-HD encoder, on the premise of picture without drop will be compressed to under 15GB.
WMV-HD, WMV9, is Microsoft's latest version of the video compression technology in the series, although the WMV-HD are unique to Microsoft's standard, but because of its strongly supports WMV series in the operating system version, which in desktop systems to rapidly growing popularity. On the performance, like data compression with H.264 WMV-HD, both applications are very similar, so the next generation of Canon ZR10 Battery Charger mainstream video coding standard among the competing for dominance, the two sides launched a diametrical struggle, struggle focused on next-generation optical specifications "HD DVD" and digital microwave radio, television and other fields.
WMA-HD formats have very high demands on the system, in order to achieve the WMA-HD format of HDTV files as you play, you need at least P4 2.4G, P4 3.0G is recommended over the processor. And according to the Microsoft recommendation match 384 MB memory and recommended playback is equipped with 512 MB memory. At the same time have a 128 MB video RAM display card is also necessary. At the same time playing also applies only to Windows XP and above, the software requires the user to install DirectX 9 and Windows Media Player 9 series. But more than just match consume system resources, such as Windows Media Player 9 or WINDVD playback software recommended system configuration requirements for more. If we use software to save system resources, such as Media Player Classic, system requirements can be reduced to the P4 2.0G/AMD 2000+, 256M, the recommended system configuration. If your computer cannot satisfy such a configuration, you may be in the picture during playback and voice sync, picture often come to a halt, the sonic boom phenomena such as, serious or even smooth viewing.
Generally uses. WMV to HDTV file suffix is WMV-HD compression.
Current DVD Forum has been tentatively approved the Microsoft MPEG-2, H.264 and WMA-HD as the next generation DVD HD-DVD technology to enforce standards.
H.264
H.264 is the International Telecommunication Union (ITU-t) developed a new generation of video compression format. Most valuable part of H.264 is undoubtedly high data compression ratio. At the same level of image quality under the condition, H.264 data compression ratio than current DVD system used in the 2-3 times MPEG-2, 1.5 per cent higher than MPEG-4 times. That is why, after H.264 compressed video data, during the network transfer needed less bandwidth and more economic. 6Mbps MPEG-2 required transmission rate matches, H.264 only need 1Mbps-2Mbps transfer rates, ranging from 3G mobile phone, iChat AV video conferencing, HD radio, HD DVD, and so on, H.264 now had access to Blu-ray Disc Association and DVD Forum adopted, a new generation of HD DVD standard, However H.264 decoding algorithm is more complicated, calculating requirements higher than WMA-HD, we know that the WMA-HD is that we can only imagine, and we know next-generation video card ATi R520 will add support for H.264 hardware decoding, but H.264 video technology is quite promising.
As with the MPEG-4, after H.264 compressed video files are generally used. avi as a suffix, also not easy to identify, through the decoder to only their own recognition.
Now, as video compression technology of constantly progress, on extract video of requirements also increasingly high, most typical of examples is Microsoft of WMV9 video compression, it up to 1080 line of resolution let many strong computer has cannot carefree play, we also remembers in four hundred and eighty six-five hundred and eighty sixths of era, a can see VCD of extract card then has became has multimedia computer of standard configuration, however as CPU of performance of enhanced, ruanjieya gradually occupy has prevailed, hard extract card gradually was eliminated, But so far through the CPU ruanjieya the last choice is a very low, so the video card internal integrated extract function growing.
(More)
UWB: a new scheme for digital entertainment in the home wireless interconnect
digitalshare | 09 November, 2011 03:50
Wireless digital entertainment to promote the family and the road connecting demand continues to grow. However, existing technologies have failed to keep pace with the growth in demand for entertainment. If you cannot achieve a high quality smooth wireless connections between devices, consumers will not be able to enjoy the fun of digital entertainment, nor full play the role of information equipment. (More)
Small Wikipedia Part 3-Flash Flash "four Liang Jin"
digitalshare | 29 September, 2011 04:30
Flash was able to light, is the xenon flash tube (Xenon) to high voltage electric shock, the Xenon Atom ionization (ionize), resulting in strong light, principle and fluorescent tubes are close, but light is a constant power supply, and Flash power supply just a moment.
Art Kaleidoscope-Samsung HXM-H300
digitalshare | 25 August, 2011 04:39
The inside of the fuselage with HDMI interface, directly through the interface connected to the HD TV, large screen television with his family to share high definition images.
(More)
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recently...
- MAX6951-LED drive and its application
- From a small Board area provide 4 voltage regulator-rail
- Battery management electronics how to increase the battery safety
- MHz synchronous switching battery charger application
- Positive and negative pulse charger
- Intelligent digital power has improved monitoring features
- Philip Bloom closer EOS C300
- Beware of the summer heat approaching the car's "dangerous goods"
- Maxim launches TacTouch piezoelectric tactile feedback controllers
- Lend you a pair of keen eye for Hyper-performance DV selection guide