barcode reader project in asp.net POWER INPUT AND DECOUPLING in Software

Encoding Denso QR Bar Code in Software POWER INPUT AND DECOUPLING

POWER INPUT AND DECOUPLING
Recognize QR Code 2d Barcode In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Printing QR Code JIS X 0510 In None
Using Barcode encoder for Software Control to generate, create QR Code 2d barcode image in Software applications.
Vcc PICMicro Vdd
Recognize QR In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
QR Code ISO/IEC18004 Generation In Visual C#.NET
Using Barcode creator for Visual Studio .NET Control to generate, create QR-Code image in .NET framework applications.
Decoupling Capacitor
Generate QR Code JIS X 0510 In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.
Quick Response Code Drawer In VS .NET
Using Barcode maker for VS .NET Control to generate, create Quick Response Code image in .NET applications.
Figure 9.2 The PIC microcontroller requires a 0.01 to 0.1 uF capacitor wired between each Vdd pin and ground.
QR-Code Creator In VB.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create QR Code JIS X 0510 image in VS .NET applications.
Bar Code Generator In None
Using Barcode creation for Software Control to generate, create bar code image in Software applications.
capacitor. Tantalum capacitors inserted backwards, like electrolytic capacitors, can catch re or explode. This is not an issue with ceramic disk or polyester caps. The second thing is to make sure that you derate the speci ed voltage of the part to 40 percent or less for your application. By following these simple rules, you should never have any problems working with tantalum capacitors. Derating a capacitor means that instead of using it at its rated voltage, you should choose a tantalum capacitor that is rated at two and a half times or more of the voltage in the application in which you plan to use them. For my applications, which call for tantalum decoupling capacitors at 5 V, I use parts that are rated at 16 V (which is a derated value less than one-third the rated value). The primary reason for this seemingly large derating is to protect the capacitors at application power-up. Voltage spikes (which are caused by power-supply startup and current transients within chips) can cause them to develop pinhole breakthroughs in the dielectric, which can cause the plates to touch. When the plates touch, heat is generated by the short circuit, which boils away more dielectric. This process snowballs until the part explodes or catches re. By derating the cap values, the dielectric layer is thicker, minimizing the opportunity for pinholes to develop. Most of the recently released PIC microcontroller part numbers are designed for power anywhere from 2.0 to 6.0 V. Some older chips are only able to run with from 4.0 to 6.0 V, whereas other older part numbers have been quali ed to run with from 2.0 to 6.0 V and are identi ed as having this capability as being low-voltage devices. Some recent PIC microcontroller part numbers can only run with 2.0 to 3.6 V. This wide variation means that you will have to ensure that you have reviewed the datasheet and understand the operating voltage level for a speci c PIC microcontroller part number. Older low-voltage PIC microcontroller parts are identi ed by the addition of the letter L before the C or F in its part number. This convention has not been followed for
European Article Number 13 Creator In None
Using Barcode encoder for Software Control to generate, create EAN / UCC - 13 image in Software applications.
Draw GS1-128 In None
Using Barcode generation for Software Control to generate, create GS1 128 image in Software applications.
BASIC OPERATING FEATURES
ECC200 Creation In None
Using Barcode drawer for Software Control to generate, create DataMatrix image in Software applications.
USS Code 39 Drawer In None
Using Barcode creator for Software Control to generate, create Code 3 of 9 image in Software applications.
all parts, so you will have to review the datasheet of the PIC microcontroller that you want to work with to make sure that it will tolerate the voltage extremes. Many PIC microcontrollers have built-in brown-out reset (BOR) and brown-out detect (BOD) circuitry that is designed to become active when the input power goes below a present point. BOR circuitry will hold a PIC microcontroller reset when the input power falls below a speci c level until it rises above it, and BOD circuitry will alert the application that the power has gone below a preset value. For some older chips, this value is set at 4.5 V, whereas in most recent devices the voltage is programmable and will allow you to work with low voltages. The older devices will work with lower voltage levels but cannot have their BOR/BOD circuitry enabled. If you are working with a PIC microcontroller in a low-voltage application that does not have the programmable BOR/BOD capability, you will have to develop your own brown-out detect circuits like the one shown in Fig. 9.3. In this circuit, if Vdd goes below the brown-out voltage determined by the Zener diode, then _MCLR will be pulled low, and the PIC microcontroller will become reset. A very common problem new application developers face with PIC microcontroller power is accidentally plugging the chip into the circuit backwards after programming. This might sound like it is an unusual problem and not warranted to be mentioned, but it is quite common if you re working on a failing application on which you just can t seem to gure out what has gone wrong and its 3 a.m. As you get more and more frustrated and tired, the PIC doesn t seem to work at all any more, and you notice that the pin 1 indicators seemed to have jumped to the other end of the chip. The best solution to this issue is to leave the PIC in circuit and program it using ICSP or ICD. I must confess that I have done this on occasion and have been amazed to discover that after the PIC microcontroller is allowed to cool off (it can get very hot when it s plugged in backwards), the chip continues to run perfectly and can be reprogrammed after this event. It seems that unless the chip is allowed to get so hot that the plastic top pops off (which is possible), the PIC microcontroller will work ne after this type of abuse. The second point about this is that your power supply should be capable of crowbarring (shutting down) the output if the current draw increases dramatically (such as in the case
Industrial 2 Of 5 Generation In None
Using Barcode generation for Software Control to generate, create Standard 2 of 5 image in Software applications.
GTIN - 12 Decoder In Visual Basic .NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET applications.
Draw UCC - 12 In Java
Using Barcode drawer for Android Control to generate, create UCC.EAN - 128 image in Android applications.
Barcode Printer In Java
Using Barcode generation for BIRT reports Control to generate, create bar code image in BIRT reports applications.
USS Code 128 Generator In None
Using Barcode generation for Font Control to generate, create USS Code 128 image in Font applications.
Data Matrix ECC200 Creator In Java
Using Barcode drawer for Eclipse BIRT Control to generate, create ECC200 image in BIRT reports applications.
GTIN - 12 Decoder In Visual C#
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET framework applications.
Code39 Drawer In .NET Framework
Using Barcode creator for VS .NET Control to generate, create Code-39 image in VS .NET applications.
Copyright © OnBarcode.com . All rights reserved.