Microchip Technology’s PIC® microcontroller is capable of supporting many FACT 1, “Basic PIC16/17 Oscillator Design” and Application Note AN Microchip’s application note AN gives a comparison between ceramic resonators and Crystals used in this application. As an alternative the PIC may be . Microchip Technology Incorporated with respect to the accu- Note AN is an excellent reference if you would like to know more about crystal operation.

Author: Nikora Dounris
Country: Japan
Language: English (Spanish)
Genre: Automotive
Published (Last): 14 March 2013
Pages: 221
PDF File Size: 9.30 Mb
ePub File Size: 13.66 Mb
ISBN: 765-2-47793-821-2
Downloads: 31085
Price: Free* [*Free Regsitration Required]
Uploader: Kajicage

November 15, Accepted: Could you please help me for this choice. Mattew 73 2 7. January 29, Published: Sign up using Facebook. Those are still inexpensive.

Otherwise use an 8 MHz crystal.

pic – Make the oscillator choice – Electrical Engineering Stack Exchange

Go for 8 MHz if you need the performance. The answer given to my question seem really different. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Both solutions give you a low power consumption. You don’t need to use the 32kHz oscillator, but you can use it if you need low power operation, or you want to do micfochip using microchup watch crystal.

If you want to use the PLL phase locked loop however, it must be between 3. A microcontroller will typically need ten times more power at 10 MHz than at 1 MHz. Why do you think you need a crystal? By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Quartz crystal resonators were rarely used in force measurement due to their poor stress concentration during bending.


The primary oscillator crystal can be anything from 3. Post as a guest Name. Sign up using Email and Password. Make the oscillator choice Ask Microcchip.

I though I would need a crystal, how can I be sure the internal oscillator would be enough? The part datasheet is just an overview, for details you should refer to the Family Reference Manual halfway down the page The Oscillator section is relevant here. If you need more accurate timing you’ll need a Note that the PIC24 also has two internal oscillators, of 8MHz and 31kHz, so you can use it without an external crystal.

The objective of this study was to construct a sensor mechanism that safely maintains the quartz crystal resonator under external force.

See note 2 in table below Note that the PIC24 also has two internal oscillators, of 8MHz and 31kHz, so you can use it without an external crystal.

We designed and analyzed the novel retention mechanism of the quartz crystal resonator. Have you read in any microcontroller tutorial about the instruction execution time cycle? That can be because you have to sample an analog signal at a high sample rate and clock this data at several Mbps though SPI, for instance. Sign up or log in Sign up using Google.

Moreover, we designed microchpi produced a compact case for mounting the retention mechanism. SPI is a synchronous protocol it has a clock line so precise timing is not critical, and PWM motor control relies on the average duty cycle so the timing is also not critical here either.

Compact Force Sensor Using AT-Cut Quartz Crystal Resonator Supported by Novel Retention Mechanism

You can still increase the clock frequency using the on-chip PLL. If you do a search on their site you will get other useful app notes such as: The choice between 32 kHz and and 8 MHz will depend on your performance requirements and power requirements.


I also added some more to the answer about crystal selection. You only need the 32kHz oscillator if you want to have a low speed oscillator present for uses like the RTC Real Time Clock peripheral, or low speed system clock operation.

Home Questions Tags Users Unanswered. The proposed structure is flat, small, and sensitive. High performance and low-power don’t go well together: Sensor output is expected to be changed by thermal expansion, so we evaluated the temperature characteristics of the assembled sensor, finding the relationship of the temperature and sensor output to be linear and temperature easily compensated for.

Email Required, but never shown.

AN PIC16/17 Oscillator Design Guide | Application Notes | Microchip Technology Inc.

In some microcontroller their are some extra features also present, You can use higher value Crystal on Oscillator Pins as well as 32KHz crystal on other pins for microcontroller internal oscillator calibrations, which is a advance level.

Preview 2 pages 0. The compact force sensor we developed uses an AT-cut aan588 crystal resonator whose resonance frequency changes under external force, and features high sensitivity, high-speed response, a wide measurement range, and superior temperature and frequency stability.