UM10699 User manual for SPI
Contents
1. 100 140 180 40 30 20 10 0 10 20 30 40 50 60 70 80 90 T C 1 Characteristic if tuned to 32 768 kHz at 25 C 2 Characteristic if tuned with the positive offset Afo Fig 6 Temperature averaged over application range 5 C to 45 C UM10699 All information provided in this document is subject to legal disclaimers NXP B V 2015 All rights reserved User manual Rev 2 12 February 2015 9 of 12 NXP Semiconductors UM10699 6 Legal information User manual for SPl bus RTC demoboard OM11059 6 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 6 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 lost2. set 12 hour mode and select option for 7 pF quartz chip disable chip enable address pointer to seconds register 0 Seconds clock integrity ok gt MSB OS 0 45 min PM 3 clock integrity ok gt OS 0 14 day of month Saturday 6 day of the week February 20 15 chip disable chip enable address pointer to seconds R W bit 1 e g 56 Seconds clock integrity ok gt OS 0 e g 46 Minutes e g 03 PM 03h e g 14 14 e g 06 Saturday e g 02 February e g 15 20 15 chip disable All information provided in this document is subject to legal disclaimers NXP B V 2015 All rights reserved User manual Rev 2 12 February 2015 7 of 12 NXP Semiconductors U M1 0699 User manual for SPl bus RTC demoboard OM11059 5 RTC tuning UM10699 5 1 Frequency tuning The 32 kHz quartzes are typically sold with a tolerance at room temperature of either 10 ppm or 20 ppm 11 5 ppm corresponds to 1 s day The quartzes require a characteristic load capacity of either 7 pF or 12 5 pF Oscillators utilizing 7 pF quartzes feature slightly lower power consumption where the quartzes of 12 5 pF have largest production quantities The tracks between quartz and RTC represent also some parasitic capacitances and must be kept short The PCF85063 has a tuning facility where above tolerances can be compensated Tuning procedure e Measure the 32xxx Hz f signal at the CLKOUT pin e The offset is
3. calculated in ppm as Afippmj 10 x f 32768 32768 e Consult the offset table in the data sheet Take the correction value and write it into the register 02h e The correction is done by means of inhibition or addition the oscillator runs at constant speed then every 2 hours mode 0 1 second is corrected to by making it shorter or longer This is not easily visible at the CLKOUT e Corrections can also be applied every 4 minutes by using mode 1 This mode will consume slightly more power The 32 kHz quarizes are of the type tuning fork and feature a parabolic frequency response over temperature When the application is dominantly used over a limited temperature range it is often helpful to tune the frequency to be slightly higher at the turn over point The error around 25 C clock goes too fast is then compensated during the time when temperature is lower or higher For example for operation between 5 C and 45 C tune the clock 8 ppm faster than the value for 25 C would be Fig 6 All information provided in this document is subject to legal disclaimers NXP B V 2015 All rights reserved User manual Rev 2 12 February 2015 8 of 12 NXP Semiconductors U M1 0699 User manual for SPl bus RTC demoboard OM11059 ATo tuning value 20 frequency 32 768 deviation Af fo Afott kHz ppm E 20 60 compensation areas
4. 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 Notwithstanding any damages that customer might incur for any reason whatsoever NXP Semiconductors aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the Terms and conditions of commercial sale of NXP Semiconductors Right to make changes NXP Semiconductors reserves the right to make changes to information published in this document including without limitation specifications and product descriptions at any time and without notice This document supersedes and replaces all information supplied prior to the publication hereof Suitability for use NXP Semiconductors products are not designed authorized or warranted to be suitable for use in life support life critical or safety critical systems or equipment nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury death or severe property or environmental damage 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 Applica
5. rights reserved User manual Rev 2 12 February 2015 11 of 12 NXP Semiconductors UM10699 User manual for SPl bus RTC demoboard OM11059 8 Contents 1 INtFOGUCHION viscisecessteccesncccsssatacenconsesersncnscerssersnanecn 3 2 Key fOAtUreS seecsecesseesseeseseeesseeeeseeenseeeeseneeeees 3 2 1 PCFS5063B Dl sisii i neoan 3 3 Hardware set up ssssunsssennsennnnnnnnnnnnnnnnnnnnnennnnnna 4 3 1 General requirements for the RTC PCFS5063BT Likeri skenarin 4 3 2 Demo board OM11059 ce eeeeeeeeeeeeeeeeteeeeeeeeee 5 4 Software Set Up cccseeeeeeeeseeeeeeeeseeeeeeeenseeeeeeees 6 4 1 FUNCHOMAIILY sses ees sionen iges 6 4 2 System t Sting ee ecceeeseeeeseeeeeeeeeneeteneeteseeeeneees 6 4 3 Software instructions for setting the clock 7 4 3 1 Setting the time cee eeeeeeeeeeeeeeeeeeeeeneeeseeeeeneees 7 4 3 2 Reading the ClOCK escceseseeeeeseneeeeeenneeeeenaees 7 5 RTC UNIN oie cece cssceccnesescecsncercsseccactssaccesuccsazearecnin 8 5 1 Frequency tuning eeeeeeeseeeeeeeeeneeeetenneeerenaees 8 6 Legal information ss ssssensesnnnnennnnnnnnnnnnnnnnnnnnnnn 10 6 1 Definitions 0 0 2 ee eeeceeeeseeceeeeeeeeeeeeeeeesseeeeeeeneeeesees 10 6 2 DISCIAIMOIS ereina 10 6 3 Tr dematkS 22s ses cecssedecdecceegevasstessceseans neirens itis 10 7 List Of FIQUIES ccseseeeeestereeseseeeeneneeeeneeenenseees 11 8 COMMONS wis cscccccccccnteccsseeccceescees tects stecesececctepeenii
6. TC CONNECTOR PCF85063BTL Function O C3 100nF 8 7 6 5 4 3 2 1 Fig 4 OM11059 block diagram UM10699 All information provided in this document is subject to legal disclaimers NXP B V 2015 All rights reserved User manual Rev 2 12 February 2015 5 of 12 NXP Semiconductors U M1 0699 User manual for SPl bus RTC demoboard OM11059 Not used Universal board PCF85063BTL staffed with Quartz XTAL1 XTL2 Landing pads for alternative quartz size C1 C2 not needed PCF85063BTL XTAL_MS3V_TIR XTALI wa 1 2 PCSSO63AF2 Fig 5 OM11059 schematics 4 Software set up 4 1 Functionality The RTC PCF85063BTL is controlled via standard SPl bus interface Common SPI protocol applies Theoretically there is no lower speed limit however a read or write access to the RTC must be finalized within one second after initiating it otherwise time counter increments could be lost During access the time registers of the RTC are frozen and after the read or write sequence is completed a seconds increment is executed if required The clock tracks the actual time from seconds to year It must be initially set to the correct time of the actual time zone The days per month and leap year are corrected automatically Leap years are assumed whenever the year is dividable by 4 The RTC can be programmed to generate an interrupt e
7. UM10699 User manual for SPl bus RTC demoboard OM11059 Rev 2 12 February 2015 User manual Document information Info Content Keywords PCF85063BTL OM11059 demoboard how to get started SPl bus RTC Real Time Clock tuning Absiract User manual for the RTC SPl bus demoboard OM11059 which contains PCF85063BTL NXP Semiconductors U M1 0699 User manual for SPl bus RTC demoboard OM11059 Revision history Rev Date Description v 2 20150212 revised version v 1 20130404 new user manual first revision Contact information For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com UM10699 All information provided in this document is subject to legal disclaimers NXP B V 2015 All rights reserved User manual Rev 2 12 February 2015 2 of 12 NXP Semiconductors U M1 0699 User manual for SPl bus RTC demoboard OM11059 1 Introduction The PCF85063x are a family of CMOS Real Time Clocks RTC and calendar optimized for low power consumption Different features sets are available The OM11059 is the ideal evaluation demo board to use in the design phase of any project just power and SPl bus must be hooked up A separate demoboard and a user manual are available for the I C bus RTCs PCF85063AT 0M13515 and UM10788 2 Key features 2 1 UM10699 The RTC PCF85063BTL with SPl bus is mounted together with a quar
8. ie 12 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 salesaddresses nxp com Date of release 12 February 2015 Document identifier UM10699
9. luding the SPI bus interface is however operating down to a lower voltage It is recommended to have a decoupling capacitor on the VDD VSS rails close by Due to the low power consumption of below 1 uW no precautions for heat dissipations are required CLKOUT can be used to measure the frequency or be used as reference for frequency generation with a PLL Quartz CLKOUT CLKenable INTerrupt Fig 2 Interfacing to microcontroller UM10699 All information provided in this document is subject to legal disclaimers NXP B V 2015 All rights reserved User manual Rev 2 12 February 2015 4 of 12 NXP Semiconductors U M1 0699 User manual for SPl bus RTC demoboard OM11059 3 2 Demo board OM11059 xTAL2 XTALI Fig 3 Picture and layout of demo bard OM11059 The OM11059 allows to easily demonstrate operation of the PCF85063BTL with SPl bus interface No need to solder the tiny package to a breadboard 100 mil connector for straight forward connections There are quartzes on the market with different load capacitance C 12 5 pF is most common 7 pF offers however lower power consumption By default a quartz with 7 pF is mounted Additional landing pads are available on the board to take a quartz in a tubular package Straight forward interfacing Connect supply voltage e g 3 3 V VSS to pin 1 VDD to pin 2 Connect SPl bus CE to pin 4 SCL to pin 3 SDI O to pin 7 Communicate to the R
10. s 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 Translations A non English translated version of a document is for reference only The English version shall prevail in case of any discrepancy between the translated and English versions 6 3 Trademarks Notice All referenced brands product names service names and trademarks are property of their respective owners NXP B V 2015 All rights reserved User manual Rev 2 12 February 2015 10 of 12 NXP Semiconductors U M1 0699 User manual for SPl bus RTC demoboard OM11059 7 List of figures Fig 1 Block diagram of the PCF85063BTL RTC 3 Fig 2 Interfacing to microcontroller 4 Fig 3 Picture and layout of demo bard OM11059 5 Fig 4 OM11059 block diagram 0 eee 5 Fig 5 OM11059 schematics eee 6 Fig 6 Temperature averaged over application range boas Coa oR bn igs OAE rere rere e 9 UM10699 All information provided in this document is subject to legal disclaimers NXP B V 2015 All
11. stomer 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 Evaluation products This product is provided on an as is and with all faults basis for evaluation purposes only NXP Semiconductors its affiliates and their suppliers expressly disclaim all warranties whether express implied or statutory including but not limited to the implied warranties of non infringement merchantability and fitness for a particular purpose The entire risk as to the quality or arising out of the use or performance of this product remains with customer 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 damage
12. tions 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 whether the NXP Semiconductors product is suitable and fit for the UM10699 All information provided in this document is subject to legal disclaimers 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 cu
13. tz crystal and the blocking capacitor buffering the supply voltage PCF85063BTL The RTC PCF85063BTL is a Real Time Clock with very small form factor counting seconds minutes hours days weekdays months and years Electronic oscillator tuning RAM 1 Byte Package HXSON10 package 2 6 x 2 6 x 0 5 mm Alarm control Timer Interrupt every 30 s or 60 s alarm timer Interface SPl bus up to 8 MHz Clock out enabled by pin or by software Quartz CLKOUT CLKen INT Fig 1 Block diagram of the PCF85063BTL RTC All information provided in this document is subject to legal disclaimers NXP B V 2015 All rights reserved User manual Rev 2 12 February 2015 3 of 12 NXP Semiconductors U M1 0699 User manual for SPl bus RTC demoboard OM11059 3 Hardware set up 3 1 General requirements for the RTC PCF85063BTL The RTC circuit just requires one external part a tuning fork quartz as resonator The oscillation capacitors are integrated and therefore there is no need for external capacitors The quartz crystal must be placed close to the RTC circuit avoiding long lines which may pick up noise Avoid any tracks with high frequency signals fast edges close to the RTC quartz or quartz interconnect The interface uses a three line standard SPI protocol chip enable serial clock serial data I O operating up to 8 MHz Supply voltage The RTC is specified from 1 8 V to 5 5 V The RTC exc
14. very 30 seconds or every 60 seconds At address byte 03h is a general purpose RAM byte to store temporary information 4 2 System testing UM10699 There is a fast mode facility to test the functionality of the RTC it can be activated by setting the EXT_TEST bit in the Control_1 word All information provided in this document is subject to legal disclaimers NXP B V 2015 All rights reserved User manual Rev 2 12 February 2015 6 of 12 NXP Semiconductors UM10699 UM10699 User manual for SPl bus RTC demoboard OM11059 The RTC PCF85063BTL has a frequency tuning facility its operation is explained in section 5 The RTC can stay switched on all the time There is no need to restart or reset the clock 4 3 Software instructions for setting the clock 4 3 1 Setting the time Setting the clock to 3 45 pm February 14 2015 CE Register address 0000 0000 Status word 0 0000 0011 0000 0010 CE CE Register address 0000 0100 Seconds 0000 0000 Minutes 0100 0101 Hours 0010 0011 Days 0001 0100 Weekdays 0000 0110 Month 0000 0010 Year 0001 0101 CE 4 3 2 Reading the clock Reading the clock 2 minutes after writing CE Register address 0000 0100 Read register 4 seconds __ Minutes Hours isi a ee ee Days i eee Weekdays _ Month eee Year eee CE chip enable address pointer to status word 0 set 12 hour mode and select option for 12 5 pF quartz
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