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View Web based Survey Poll Management. INTRODUCTION A transistor is a small electronic device that can cause changes in a large electrical output signal by small changes in a small input signal. Crystal Version Crystal Reports 2008 Business Objects XI I have written a query to populate a subreport and want to pull in a parameter to that query based on. ABOUT US Designing, manufacturing and providing solutions for heater technology. Crystal Technica have been designing and manufacturing advanced ceramic elements and. RTLSDR and GNU Radio with Realtek RTL2832U Elonics E4000Raphael Micro R820T software defined radio receivers. Originally meant for television reception and. Peripheral Driver Library PDL The PDL is a complete software development kit for the PSoC 6 MCU Portfolio. It provides the source code you need to customize any. Electronics/A3008/S3008B_2.gif' alt='Crystal Filter Design Software' title='Crystal Filter Design Software' />Back. Stage Event Management Softwaresmart. HR Recruitment Training Software. E Share File Sharing Application. QR Code Quick Response Code Generator. Hardware Design Checklist Texas Instruments Wiki. As you are creating the schematics for your project here are a few things to consider. Before you begin. Documentation. Make sure you have the latest version of documentation, especially the data sheet and silicon errata. TIP Try searching the documentation for words such as must, require, do not, shall, note, etc. Important criteria for the device will typically contain one or more of these words. This is an easy way to make sure you have not missed anything important. TIP on each ti. Alert me about changes to this product. Registration here will enable proactive automatic notification of device errata. Pin out Have you verified that your pin labels correspond to the correct pin numbers Have you verified that the power pins are connected to the correct supply railsPullupsPulldowns Internal pull uppull down resistors are implemented with weak transistors. As the voltage present on the IO pin varies the relative gate voltage to this weak transistor changes which will cause the effective pull uppull down resistance to change. Therefore, internal resistors do not have a linear response like external resistors. The non linearity along with process voltage and temperature variations require internal pull uppull down resistors to be specified with a wide range of resistance or current sourcingsinking. The input current without a pull up or pull down turned on defines the input leakage without any current from internal pull resistors. The input current with a pull up or pull down turned on defines a combination of input leakage current and current required to force the internal pull resistors to the opposite voltage rail. For example, if an internal pull up is turned on the value shown represents the total current required to pull the input to VSS. When deciding what value of external resistor to use, you must consider the worst case combination of all internal leakage paths of all devices connected to a signal and make sure the external resistor is able to force these internal leakage paths to a potential greater than Vih min, or less than Vil max. Critical Connections. Decoupling Capacitors. Voltages from traces on a printed circuit board can couple to each other in places where it is not desired, like power supply planes. To decouple the traces, we add capacitors to absorb some of the voltage and help reduce this effect. For more information on how to correctly place decoupling caps, see the data sheet section for power supply decoupling. PLL and some analog supplies benefit from filters or ferrite beads to keep the noise from causing clock jitter. The minimum recommendation is a ferrite bead with a resonance at 1. MHz along with at least one capacitor on the device side of the bead. Additional recommendation is to add one capacitor just before the bead to form a Pi filter. The filter needs to be as close as possible to the device pin, with the device side capacitor being the most important thing to be close to the device pin. PLL pins close together can be combined on the same supply. PLL pins farther away from each other may need their own filtered supply. Refer to General Hardware Design BGA PCB DesignBGA Decoupling Wiki. Power Sequencing. Are all requirements being met in terms of the order, delays, etc. Clocking. Make sure your input clockcrystal meets the data sheet requirements. For example. Frequency ESR for crystal Load capacitance meets both the crystals and processors requirements Crystal and caps placed physically close to processor Double check proper voltage level for clock some devices will use core voltage, others IO voltage. If there are any PLL configuration pins make sure they are set such that the resulting frequency is within device spec. Also, having alternate population options for those PLL pins could be handy. OSC Internal Oscillator Clock source. The figure below shows the recommended crystal circuit. It is recommended that pre production printed circuit board PCB designs include the two optional resistors Rbias and Rs. They may be required for proper oscillator operation when combined with production crystal circuit components. OSC Crystal Circuit Schematics. In general, adding Rbais and Rs resistors improves circuit performance by reducing the long start up time, crystal overdrive and voltage and temperature related issues. Wwf No Mercy 2010 more. Specifically, they provide the following functionality. Rs helps reduce the drive level on the crystal and decreases the slew rate, which adds additional phase shift. Recommended value 5. Ohms. Rbais a. k. Recommended value 1. M Ohms. However, in most cases Rbias is not required and Rs is a 0 resistor. These resistors may be removed from production PCB designs after evaluating oscillator performance with production crystal circuit components installed on pre production PCBs. Please refer the below application note for calculation of Rs and RBais values. Please refer the application note for the calculation of Rs and RBais values Crystek Application notes. Oscillator components Crystal, C1, C2, optional Rbias and Rd must be located close to the OMAPL1x package. Parasitic capacitance to the printed circuit board PCB ground and other signals should be minimized to reduce noise coupled into the oscillator. Reset. Make sure that reset is kept asserted for the processor as the power supplies are ramping. You must not release the processor from reset until all the proper voltageclocking is in place as specified by the data sheet. How To Install Bodyguard Mod Gta Iv. Conversely make sure that something on the board is actually RELEASING the reset once power and clocks are stable A useful tip is to place a 0. F cap near the reset pin to help avoid ESD induced resets. Also, you might want to have a reset button on your board as it can be helpful for development. Boot modes Double check that the boot configuration pins are set to the correct option. Its highly recommended to have some population options to be able to easily change the reset mode. This can be handy in a variety of circumstances. For example, if you were doing a NOR flash boot and you ever accidentally put in some bad code you might end up in a scenario where you cant connect to the device with emulator because its in a bad state, and you cant reprogram the flash as a resultHaving an alternate boot mode can be a life saver Read carefully the initialization section in the Technical Reference Manual of your processor. We may have to deal with important information that can change your design. Look for which chip select is used by default, default clock setups, bus widths, wait states, supported booting devices, initial fetch address and interrupt vector addresses, default memory map and so on. CAUTION Be careful if anything is hooked up to these pins i. GPIO or other peripherals. You must make sure that the boot pins are at the proper levels when power on reset occurs such that the correct values are latched in order for the device to boot correctly Pin Muxing. Although pin muxing is frequently software configurable, often the initial configuration is dependent on several configuration pins e. Make sure that the initial pin muxing corresponds properly with your boot modes so that any interfaces necessary for boot will be available. On some devices this could potentially be handled by the boot ROM, but to be certain you should configure the initial pin muxing appropriately.