From Microchip Technology, Inc.
The oscillator circuit is one of the most overlooked areas of microprocessor circuit design. Components are usually selected based on the manufacturers tables. If the circuit starts up and works, fine, no other thought need be given to it, right Wrong. Many conditions can negatively affect the performance of your design. Higher temperatures and lower supply voltages can lower the loop gain in the oscillator circuit, causing poor, slow, or no start-up. Colder temperatures and higher supply voltages can increase the loop gain of the oscillator circuit, causing the crystal to be overdriven, and potentially damaged; or the circuit can be forced to another harmonic and throw off the timing, or cease functioning altogether. It is also possible to waste power through the improper selection of components or Clock modes.
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Microcontrollers (MCU) are complete computer systems on a chip. They combine an arithmetic logic unit (ALU), memory, timer/counters, serial port, input/output (I/O) ports and a clock oscillator.
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Topics of Interest
The oscillator circuit is one of the most overlooked areas of microprocessor circuit design. Components are usually selected based on the manufacturers tables. If the circuit starts up and works,...
The oscillator circuit for almost any microcontroller is a fairly simple design with very few components. Selecting the values for capasitors and resistors from the manufacturer's data books will get...
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Many Microchip customers ask us for help when designing their oscillator circuits. Due to the great number of combinations of VDD and temperature ranges, crystal or resonator, loading capacitors,...
