R_10077 Driving LPC5410x with EPSON Crystals Rev. 1.0 — 06 October 2015 Document information Info Content Keywords LPC5410x, Crystal, RTC, Oscillator Abstract Characterization results of EPSON crystals with LPC5410x (RTC) 32.768kHz Oscillator. Report R_10077 NXP Semiconductors Driving LPC5410x 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_10077 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 6 R_10077 NXP Semiconductors Driving LPC5410x with EPSON Crystals 1. Introduction The LPC5410x series microcontrollers are ARM Cortex-M4F-based MCUs designed to handle the space and power constraints of sensing applications, from simple, ultra-low-power sensor listening, to data aggregation, sensor fusion or other sensor data processing, and external communication. This microcontroller family supports four different clock sources: internal IRC oscillator, watchdog oscillator, external CLKIN and 32.768 kHz RTC oscillator. The nominal IRC frequency is 12 MHz. Upon power-up or any chip reset, the LPC5410x 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 32.768 kHz (RTC) crystals with LPC5410x oscillator and the results/recommendations are given below. 2. Characterization results 2.1 Oscillator circuit Fig 1. R_10077 Report 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 6 R_10077 NXP Semiconductors Driving LPC5410x with EPSON Crystals 2.2 Recommended crystals and external components Based on the characterization results, following crystals and external components are recommended for LPC5410x series microcontrollers. Note that equivalent crystals from other manufacturers can also be used instead. Table 1. Recommended crystals and external components Product Frequency Name [kHz] FC-135R 32.768 Product Code CL External Components Drive Level |-R| [pF] Cd [pF] Cg [pF] [uW] [kΩ] X1A0001410003xx 12.5 22 18 0.008 430 X1A0001410002xx 9.0 15 12 0.005 820 X1A0001410001xx 7.0 10 10 0.003 1000 X1A0001410006 6.0 8 8 0.003 1000 Table 2. Recommended crystals and external components Table description (optional) Product Frequency CL External Components Name [kHz] [pF] Cd [pF] Cg [pF] FC1610AN 32.768 Drive Level |-R| [uW] [kΩ] 12.5 18 18 0.007 510 9.0 12 12 0.005 1000 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. So, 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_10077 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. 4 of 6 R_10077 NXP Semiconductors Driving LPC5410x 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. 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All rights reserved. 5 of 6 R_10077 NXP Semiconductors Driving LPC5410x with EPSON Crystals 4. Contents 1. 2. 2.1 2.2 3. 3.1 3.2 3.3 4. Introduction ......................................................... 3 Characterization Results .................................... 3 Oscillator Circuit ................................................. 3 Recommended Crystals and External Components ....................................................... 4 Legal information ................................................ 5 Definitions .......................................................... 5 Disclaimers......................................................... 5 Trademarks ........................................................ 5 Contents ............................................................... 6 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_10077