UM10698 User manual for I2C-bus RTC demo board OM11059A
Contents
1. UM10698 There are two RTC variants of the PCF85063x RTC with I C bus PCF85063TP _ basic functionality with I C bus interface PCF85063ATL enhanced functionality with C bus interface PCF85063TP The PCF85063TP 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 HWSON8 package 2 x 3 x 0 5 mm Interrupt every 30 s or 60 s e g for waking up the microcontroller Interface 400 kHz I C bus Quartz CLKOUT INT Fig 1 Block diagram of the PCF85063TP RTC All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 3 27 February 2014 3 of 14 NXP Semiconductors U M1 0698 User manual for I2C bus RTC demo board OM11059A 2 2 PCF85063ATL The PCF85063ATL 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 400 kHz I C bus Clock out enabled by pin or by software Quartz CLKOUT Vop CLKen C INT BUS Vss Fig 2 Block diagram of the PCF85063ATL RTC UM10698 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rig2. 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 calculated in ppm as Afipom 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 quartzes 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
3. 11059A Set jumper to either PCF85063TP or PCF85063ATL Connect supply voltage e g 3 3 V VSS to pin 1 VDD to pin 2 Connect C bus pull up resistor needed SCL to pin 3 SDA to pin 4 Communicate to the RTC CLKOE CLKOUT2 ATL CLKOUT1 TP INT SCL SDA VDD VSS Fig 6 OM11059A block diagram UM10698 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 3 27 February 2014 7 of 14 NXP Semiconductors UM10698 User manual for I2C bus RTC demo board OM11059A 1 XTAL_CM7V_T1A Fig 7 2 GND ajojn vss PCBED63TP_HXSONS a pS a 100rF J l Da2 S2 sml CON8 VDD C2 GND u1 a u2 100nF rA e M Von Ei osi von L HH osi von Hi OO cLKoUuT 24 0O CLKOUT INT SB SDA a2 rm mi7 DA 5 i 44 INT SCL XTAL_CM12 5V_T1A PCA5DG3ATL_QFN10 GND OM11059A schematics 4 Software set up UM10698 4 1 Functionality The RTC PCF85063TP and PCF85063ATL are controlled via standard C bus interface Common C protocol applies The interface is the standard Fast Mode I C bus operating up to 400 kHz 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
4. UM10698 User manual for I2C bus RTC demo board OM11059A Rev 3 27 February 2014 User manual Document information Info Content Keywords PCF85063TP PCF86063ATL OM11059A demoboard how to get started I 7C bus RTC Real Time Clock tuning User manual for the RTC I2C bus demoboard OM11059A which contains PCF85063TP and PCF85063ATL Absiract NXP Semiconductors U M1 0698 User manual for I2C bus RTC demo board OM11059A Revision history Rev Date Description v 3 20140227 Revised user manual v 2 20130404 Revised user manual v 1 20130320 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 UM10698 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 3 27 February 2014 2 of 14 NXP Semiconductors U M1 0698 User manual for I2C bus RTC demo board OM11059A 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 OM11059A is the ideal evaluation demo board to use in the design phase of any project just power and I C bus must be hooked up A separate demoboard and a user manual are available for the SPl bus RTC PCF85063BTL OM11059 and UM10699 2 Key features 2 1
5. 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 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 whether the NXP Semiconductors product is suitable and fit for the UM10698 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
6. anties 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 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 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
7. e clock UM10698 Reading the clock I C bus Slave address Register address I C bus Slave address Read register 4 seconds Minutes Hours Days Weekdays Month All information provided in this document is subject to legal disclaimers S 1010 0010 0000 0000 0000 0011 0000 0010 Start condition write bit set address pointer to status word 0 set 12 hour mode and select option for 12 5 pF quartz for the PCF85063ATL set 12 hour mode and select option for 7 pF quartz for the PCF85063TP Repeated start condition 1010 0010 0000 0100 0000 0000 0100 0101 0010 0011 0001 0101 0000 0100 0001 0010 0001 0001 P write bit set address pointer to seconds register 0 Seconds clock integrity ok gt MSB OS 0 45 min PM 3 clock integrity ok gt OS 0 15 Thursday 4 day of the week December 20 11 Stop condition 2 minutes after writing S 1010 0010 0000 0100 Sr 1010 0011 Start condition write bit set address pointer to seconds byte 4 repeated start condition read mode e g 56 Seconds clock integrity ok gt OS 0 e g 45 Minutes e g 03 PM 03h e g 15 15 e g 04 Thursday e g 12 December NXP B V 2014 All rights reserved User manual Rev 3 27 February 2014 9 of 14 NXP Semiconductors U M1 0698 User manual for I2C bus RTC demo board OM11059A Year 2 2 beens e g 11 20 11 e C bus P Stop condition 5 RTC tuning 5
8. eir respective owners NXP B V 2014 All rights reserved User manual Rev 3 27 February 2014 12 of 14 NXP Semiconductors U M1 0698 User manual for I2C bus RTC demo board OM11059A 7 List of figures Fig 1 Block diagram of the PCF85063TP RTC 3 Fig 2 Block diagram of the PCF85063ATL RTC 4 Fig 3 Interfacing to microcontroller 5 Fig 4 Picture of demo board OM11059A 06 6 Fig 5 Jumper SCUINGS einer 6 Fig 6 OM11059A block diagram 7 Fig 7 OM11059A schematics ee a 8 Fig 8 Temperature averaged over application range SO O 45 OEE T deceeteiecs 11 UM10698 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 3 27 February 2014 13 of 14 NXP Semiconductors UM10698 User manual for I2C bus RTC demo board OM11059A 8 Contents 1 INtFOGUCTION wisciscseissecccsncsceesntccaneansererancnssenssersnanacn 3 2 Key fOAtUreS cseccseccsseeesseecsseeesseeeseeeeeeeseseeeesees 3 2 1 POF85003TP actcscvs caszecessceasctablolanstngach cchsdncgace snes 3 2 2 POF85063AT L eiii coset ats cadlecetasten ceebensdesobbeisiethes 4 3 Hardware set up eccssseeeeessseeseseseeeenseeeeenseeenensene 5 3 1 General requirements for the RTCs PCF85063TP and PCF85063AT L 5 3 2 Demo board OM11059A crecer 6 4 Software Set Up csseeseseesseeeseeesseeeeeseeeseeeeeees 8 4 1 FUNCHOMAIIY senie
9. 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 See Fig 5 UM10698 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 3 27 February 2014 10 of 14 NXP Semiconductors U M1 0698 User manual for I2C bus RTC demo board OM11059A ATo tuning lue 20 bie frequency 32 768 deviation Af fo Afott kHz ppm E 20 60 compensation areas 100 140 180 40 30 20 10 0 10 20 30 40 50 60 70 80 90 TC 1 Characteristic if tuned to 32 768 kHz at 25 C 2 Characteristic if tuned with the positive offset Afoy Fig 8 Temperature averaged over application range 5 C to 45 C UM10698 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 3 27 February 2014 11 of 14 NXP Semiconductors UM10698 6 Legal information User manual for I2C bus RTC demo board OM11059A 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 warr
10. hts reserved User manual Rev 3 27 February 2014 4 of 14 NXP Semiconductors U M1 0698 User manual for I2C bus RTC demo board OM11059A 3 Hardware set up 3 1 General requirements for the RTCs PCF85063TP and PCF85063ATL 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 is the standard Fast Mode I C bus operating up to 400 kHz Adjust pull up values to match the required interface speed keeping them as high impedance as possible for power system saving Ensure that the specified minimum requirements of the hold times tlow and tyicu are fulfilled Supply voltage The RTC is specified from 0 9 V to 5 5 V The I C bus interface is specified from 1 8 V to 5 5 V 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 Fig 3 Interfacing to microcontroller CLKOUT CLKenable INTerrupt 12C bus UM10698 All information prov
11. ided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 3 27 February 2014 5 of 14 NXP Semiconductors U M1 0698 UM10698 User manual for I2C bus RTC demo board OM11059A 3 2 Demo board OM11059A u2 S i Jy u baonu EI ee SCL Ct 0M110539A U1 PCF85063TP U2 PCF85063ATL Fig 4 Picture of demo board OM11059A The OM11059A allows to easily demonstrate the operation of the PCF85063x with I C bus interface No need to solder the tiny package to a breadboard 100 mil connector for straight forward connections Both RTCs are on board and can be selected by setting the jumpers J1 and J2 see Fig 5 J1 SDA i ey S J2 SCL OM11059A OM11059A Jumper set for Jumper set for PCF85063TP PCF85063ATL Fig 5 Jumper settings On the market there are quartzes with different load capacitance C 12 5 pF is most common 7 pF offers however lower power consumption To evaluate the difference the PCF85063TP is connected to a quartz with C_ 7 pF and the PCF85063ATL is connected to a quartz with 12 5 pF Also the Vpp blocking capacitors are mounted C1 C2 Straight forward interfacing All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 3 27 February 2014 6 of 14 NXP Semiconductors U M1 0698 User manual for I2C bus RTC demo board OM
12. liates 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 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 th
13. nas 8 4 2 System testinG cccsscecccessceeceecenesseeseeessceneeeesnes 8 4 3 Software instructions for setting the clock 9 4 3 1 Setting the time eenen 9 4 3 2 Reading the Clock 9 5 PREC TUNING iieieieevisccccencniseeveteereceecsnerveccseeevenewen 10 5 1 Frequency tuning cecceeeseeeeeeeneeeenteeeeeeeas 10 6 Legal information cccsseesseeeeeseseenenseeeeeneee 12 6 1 D fINITIONS serisi inina psn beteeeeie rs 12 6 2 DISCIAINNGIS 5 soiee s202i5 canec hes saadseeeslacctesaagesadscdecsersoes 12 6 3 Trad markS iiine ancians 12 7 List Of figUreS assssssnunseennsnnnnennnnnnnnnnnnnnnnnnnnnnnn 13 8 OET 14 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 2014 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 27 February 2014 Document identifier UM10698
14. 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 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 affi
15. 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 every 30 seconds or every 60 seconds At address byte 03h is a general purpose RAM byte to store temporary information 4 2 System testing 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 The RTC PCF85063x has a frequency tuning facility its operation is explained in section RTC tuning All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 3 27 February 2014 8 of 14 NXP Semiconductors UM10698 User manual for I2C bus RTC demo board OM11059A 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 December 15 2011 I C bus Slave address Register address Status word 0 I C bus Slave address Register address Seconds Minutes Hours Days Weekdays Month Year I C bus 4 3 2 Reading th
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