R_10075 Driving LPC1500 with EPSON Crystals Rev. 1.0 — 06 October 2015 Report Document information Info Content Keywords LPC15xx, RTC, Crystal, Oscillator Abstract Characterization results of EPSON crystals with LPC15xx MHz and (RTC) 32.768 kHz Oscillator. R_10075 NXP Semiconductors Driving LPC1500 with EPSON Crystals Revision history Rev Date 1.0 20151006 Description Initial version Contact information For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: [email protected] R_10075 Report All information provided in this document is subject to legal disclaimers. Rev. 1.0 — 06 October 2015 © NXP B.V.2015. All rights reserved. 2 of 7 R_10075 NXP Semiconductors Driving LPC1500 with EPSON Crystals 1. Introduction The LPC15xx series are Cortex-M3 based MCUs running at speeds up to 72MHz. This microcontroller family supports four different clock sources: internal IRC oscillator, watchdog oscillator, crystal (MHz) oscillator, and 32.768 kHz (RTC) oscillator. The nominal IRC frequency is 12 MHz. Upon power-up or any chip reset, the LPC15xx starts up with IRC as the clock source. Software may later switch to one of the other available clock sources. We have evaluated/characterized EPSON make 12 MHz and 32.768 kHz (RTC) crystals with LPC15xx and the results/recommendations are given below. 2. Characterization results 2.1 MHz oscillator circuit Fig 1. R_10075 Report MHz oscillator circuit All information provided in this document is subject to legal disclaimers. Rev. 1.0 — 06 October 2015 © NXP B.V. 2015. All rights reserved. 3 of 7 R_10075 NXP Semiconductors Driving LPC1500 with EPSON Crystals 2.2 MHz recommended crystals and external components Based on the characterization results, following crystals and external components are recommended for LPC15xx series microcontrollers. Note that equivalent crystals from other manufacturers can also be used instead. Table 1. Recommended crystals and external components Product Product Code Frequency CL External Components Drive Level |-R| Name [MHz] [pF] Cd [pF] FA-238V Q22FA23V00019** 12 10 7 FA-238V Q22FA23V00007** 12 12 FA-20H 12 10 Q24FA20H00152** Cg [pF] [uW] [Ω] 7 37 2490 10 10 49 1890 7 7 69 2490 2.3 RTC oscillator circuit Fig 2. R_10075 Report kHz (RTC) oscillator circuit All information provided in this document is subject to legal disclaimers. Rev. 1.0 — 06 October 2015 © NXP B.V. 2015. All rights reserved. 4 of 7 R_10075 NXP Semiconductors Driving LPC1500 with EPSON Crystals 2.4 RTC recommended crystals and external components Table 2. Recommended crystals and external components Product Product Code Frequency CL External Components Drive Level |-R| Name [kHz] [pF] Cg [pF] Cd [pF] [uW] [kΩ] FC-135 Q13FC13500004** 32.768 12.5 22 18 0.11 560 MC-146 Q13MC14620002** 32.768 12.5 22 18 0.13 560 Notes: 1. Above recommendations are based on the actual evaluation results and solely intended to help users in picking the right components. 2. Note that these results are based on a particular hardware board (design) and a particular LPC MCU sample. Therefore, it does not cater to part to part variation, be it MCU or the external components. 3. As the actual board layout (design) and choice of external components greatly influences the best suitable crystal load capacitance, we do not assume any responsibility and grant warranty for above recommendations. 4. It is always recommended that the end users evaluate their own designs to ensure the best performance desired. For more information on these crystals and guidelines, please visit the EPSON website. http://www5.epsondevice.com/en/ic_partners/nxp/lpc1x.html R_10075 Report All information provided in this document is subject to legal disclaimers. Rev. 1.0 — 06 October 2015 © NXP B.V. 2015. All rights reserved. 5 of 7 R_10075 NXP Semiconductors Driving LPC1500 with EPSON Crystals 3. Legal information 3.1 Definitions Draft — The document is a draft version only. The content is still under internal review and subject to formal approval, which may result in modifications or additions. NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information. 3.2 Disclaimers Limited warranty and liability — Information in this document is believed to be accurate and reliable. However, NXP Semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. In no event shall NXP Semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. 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NXP Semiconductors accepts no liability for inclusion and/or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer’s own risk. Applications — Applications that are described herein for any of these products are for illustrative purposes only. NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Customers are responsible for the design and operation of their applications and products using NXP Semiconductors products, and NXP Semiconductors accepts no liability for any assistance with applications or customer product design. It is customer’s sole responsibility to determine R_10075 Report whether the NXP Semiconductors product is suitable and fit for the customer’s applications and products planned, as well as for the planned application and use of customer’s third party customer(s). Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. NXP Semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer’s applications or products, or the application or use by customer’s third party customer(s). Customer is responsible for doing all necessary testing for the customer’s applications and products using NXP Semiconductors products in order to avoid a default of the applications and the products or of the application or use by customer’s third party customer(s). NXP does not accept any liability in this respect. Export control — This document as well as the item(s) described herein may be subject to export control regulations. Export might require a prior authorization from competent authorities. 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In no event shall NXP Semiconductors, its affiliates or their suppliers be liable to customer for any special, indirect, consequential, punitive or incidental damages (including without limitation damages for loss of business, business interruption, loss of use, loss of data or information, and the like) arising out the use of or inability to use the product, whether or not based on tort (including negligence), strict liability, breach of contract, breach of warranty or any other theory, even if advised of the possibility of such damages. Notwithstanding any damages that customer might incur for any reason whatsoever (including without limitation, all damages referenced above and all direct or general damages), the entire liability of NXP Semiconductors, its affiliates and their suppliers and customer’s exclusive remedy for all of the foregoing shall be limited to actual damages incurred by customer based on reasonable reliance up to the greater of the amount actually paid by customer for the product or five dollars (US$5.00). The foregoing limitations, exclusions and disclaimers shall apply to the maximum extent permitted by applicable law, even if any remedy fails of its essential purpose. 3.3 Trademarks Notice: All referenced brands, product names, service names and trademarks are property of their respective owners. All information provided in this document is subject to legal disclaimers. Rev. 1.0 — 06 October 2015 © NXP B.V. 2015. All rights reserved. 6 of 7 R_10075 NXP Semiconductors Driving LPC1500 with EPSON Crystals 4. Contents 1. 2. 2.1 2.2 2.3 2.4 3. 3.1 3.2 3.3 4. Introduction ......................................................... 3 Characterization Results .................................... 3 MHz Oscillator Circuit ......................................... 3 MHz Recommended Crystals and External Components ....................................................... 4 RTC Oscillator Circuit ......................................... 4 RTC Recommended Crystals and External Components ....................................................... 5 Legal information ................................................ 6 Definitions .......................................................... 6 Disclaimers......................................................... 6 Trademarks ........................................................ 6 Contents ............................................................... 7 Please be aware that important notices concerning this document and the product(s) described herein, have been included in the section 'Legal information'. © NXP B.V. 2015. All rights reserved. For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: [email protected] Date of release: 06 October 2015 Document identifier: R_10075