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portable

Wireless Communication Technology

This is a book on wireless communication. That usually means communica- tion by radio, though ultrasound and infrared light are also used occasion- ally. The term “wireless” has come to mean nonbroadcast communication, usually between individuals who very often use portable or mobile equip- ment. The term is rather vague, of course, and there are certainly borderline applications that are called wireless without falling exactly into the above definition.

標(biāo)簽： Communication Technology Wireless

上傳時間： 2020-06-01

上傳用戶：shancjb
XR2981

2.7V to 5.5V input voltage Range? Efficiency up to 96% ? 24V Boost converter with 12A switch current Limit? 600KHz fixed Switching Frequency? Integrated soft-start? Thermal Shutdown? Under voltage Lockout? Support external LDO auxiliary power supply? 8-Pin SOP-PP PackageAPPLICATIONSportable Audio Amplifier Power SupplyPower BankQC 2.0/Type CWireless ChargerPOS Printer Power SupplySmall Motor Power Supply

標(biāo)簽： XR2981

上傳時間： 2021-11-05

上傳用戶：
PW4556_2.0.pdf規(guī)格書下載

The PW4556 series of devices are highly integrated Li-Ion and Li-Pol linear chargers targetedat small capacity battery for portable applications. It is a complete constant-current/ constantvoltage linear charger. No external sense resistor is needed, and no blocking diode is required dueto the internal MOSFET architecture. It can deliver up to 300mA of charge current (using a goodthermal PCB layout) with a final float voltage accuracy of ±1%. The charge voltage is fixed at 4.2V or4.35V, and the charge current can be programmed externally with a single resistor. The chargerfunction has high accuracy current and voltage regulation loops and charge termination

標(biāo)簽： pw4556

上傳時間： 2022-02-11

上傳用戶：1208020161
PW4203_2.0.pdf規(guī)格書下載

PW4203 is a 4.5-22V input, 2A multi-cell synchronous Buck Li-Ion battery charger, suitable forportable application. Select pin is convenient for multi-cell charging. 800 kHz synchronous buckregulator integrates of 22V rating FETs with ultra low on- resistance to achieve high efficiency andsimple circuit design.The PW4203 is available in an 8-pin SOP package, provides a very compact system solution andgood thermal conductance

標(biāo)簽： pw4203

上傳時間： 2022-02-11

上傳用戶：
PW4055_2.0.pdf規(guī)格書下載

The PW4055 is a complete constant-current /constant-voltage linear charger for single cell lithiumion batteries.Its ThinSOT package and low external component count make the PW4055 ideallysuited for portable applications.Furthermore, the PW4055 is specifically designed to work within USBpower specifications.The PW4055 No external sense resistor is needed, and no blocking diode is required due to theinternal MOSFET architecture.Thermal feedback regulates the charge current to limit the dietemperature during high power operation or high ambient temperature. The charge voltage is fixedat 4.2V, and the charge current can be programmed externally with a single resistor. The PW4055automatically terminates the charge cycle when the charge current drops to 1/10th the programmedvalue after the final float voltage is reached. When the input supply (wall adapter or USB supply) isremoved, the PW4055 automatically enters a low current state, dropping the battery drain currentto less than 2μA. The PW4055 can be put into shutdown mode, reducing the supply current to 25μA.The BAT pin has a 7KV ESD(HBM) capability. Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presenceof an input voltage

標(biāo)簽： pw4055

上傳時間： 2022-02-11

上傳用戶：jason_vip1
PW2053-2.0.pdf規(guī)格書

The PW2053 is a high-efficiency monolithic synchronous buck regulator using a constantfrequency, current mode architecture. The device is available in an adjustable version. Supply currentwith no load is 40uA and drops to <1uA in shutdown. The 2.5V to 5.5V input voltage range makesthe PW2053 ideally suited for single Li-Ion battery powered applications. 100% duty cycle provideslow dropout operation, extending battery life in portable systems. PWM/PFM mode operationprovides very low output ripple voltage for noise sensitive applications. Switching frequency isinternally set at 1.2MHz, allowing the use of small surface mount inductors and capacitors. Lowoutput voltages are easily supported with the 0.6V feedback reference voltage

標(biāo)簽： pw2053

上傳時間： 2022-02-14

上傳用戶：jason_vip1
FreeRTOS移植PIC18F25K22全過程詳解

1 準(zhǔn)備1.1 硬件和編譯環(huán)境1.1.1 開發(fā)板硬件選用PIC18F25K22，在淘寶上可以買到開發(fā)板， LIXUE 工作室出品的。價格在140 左右。1.1.2 IDE編譯環(huán)境為MPLAB IDE V8.87C 編譯器為MCC18，版本號為3.38（以上編譯環(huán)境均由開發(fā)板中的光盤提供）1.1.3 仿真器PICkit3，同一家店買的1.2 FreeRTOS 相關(guān)移植文件準(zhǔn)備1.2.1 下載移植文件在Microchip 官網(wǎng)下載通用移植文件http://embeddedcodesource.com/rtos我是選了下面這個，點擊download 即可下載，解壓后里面存在如下文件，1.2.2 查找有用的文件下載到的FreeRTOS為6.0.4 版本1）找到三個.c 文件如上圖所示，解壓后，主要的文件在FreeRTOS\Source文件夾中，如下所示：其中l(wèi)ist.c ， queue.c ，tasks.c 無需修改，作為主要的FreeRTOS的文件，2）找到與.c 文件對應(yīng)的.h 文件如下圖所示，與之對應(yīng)的在FreeRTOS\Source\include文件夾中：找到list.h ， queue.h ，tasks.h，也無需修改。3）另外還有用的文件包括FreeRTOS.h , portable.h ，projdef.h4）找到heap_1.c找到FreeRTOS\Source\portable\MemMang文件夾里面5）移植修改文件主要包括port.c portmacro.h，在找到FreeRTOS\Source\portable\MPLAB\PIC18F文件夾里面6）其他文件在FreeRTOS_C18\FreeRTOS PrimerEjemplo文件夾中包含了主體的Demo 工程文件，關(guān)注FreeRTOSConfig.h，還有兩個.lkr 鏈接文件。2 示例Demo 說明點開FreeRTOS_C18\FreeRTOS PrimerEjemplo 文件夾中的.mcw 工程文件，發(fā)現(xiàn)提示丟失文件，如下所示，其實是定位出現(xiàn)文件，依次對應(yīng)步驟1.2.2 中的各個文件夾位置查找，重新定位即可，定位好之后，編譯即可通過，

標(biāo)簽： freertos

上傳時間： 2022-06-24

上傳用戶：