UM10788 User manual for I²C-bus RTC demo board OM13515
Contents
1. 0788 User manual for I2 C bus RTC demo board OM13515 3 2 Demo board OM13515 INT nc ne CLK O OO 2 O00 ooo O OO o0o 0 92000 ooo ooo 0000000000 Z OM13515 PCF85063 Fig 3 Picture of demo board OM13515 The OM13515 allows easily demonstrating the operation of the PCx85063A with I C bus interface No need to solder the tiny package to a breadboard 100 mil connector for straight forward connections To visualize the interrupt an LED D1 is mounted To minimize the power consumption it can be switched off by removing the jumper J2 To measure the current consumption just replace jumper J1 by a pA meter The market offers quartzes with different load capacitances C 12 5 pF is most common C 7 pF as used on the board offers however lower power consumption Straight forward interfacing e Connect supply voltage e g 3 3 V Vss to pin 1 Vpp to pin 2 e Connect I C bus pull up resistor needed SCL to pin 4 SDA to pin 3 e Connect interrupt and or CLKOUT if required e Communicate with the RTC UM10788 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 2 4 August 2014 6 of 16 UM10788 NXP Semiconductors User manual for I2C bus RTC demo board OM13515 Experimental Area GND VDD SDA SCL INT nc ne CLK nc Fig 4 OM13515 circuit diagram All information provided in this2. 1 8 1 8 2 8 3 10 INtFOGUCHION sicciscscsssccccsncctessntecescnsecserancnscesssarsnaneen 3 Key fOAtUreS seecseeeesseeeseessseeeseeeenseeenseeeaseeensees 3 PCx85063AT PCF85063ATT ecceeeeeeeeeeeees 3 Hardware set up sccssseetsssseessseeeeessseeeensseenensees 5 General requirements for the RTCs PCx85063A5 Demo board OM13515 nee 6 Graphical User Interface with OM13518 USB C bus dongle eeecsseceseeeeseeeeseeeseeenseeeeseenses 8 USB I 7C dongle ereere 8 Software GU rsrsrsr iunie 8 Software Set Up cssecsescesseeeeseeesseeeeeseeeseeeeeeees 9 FUNCHOMAIILY sacris 9 System testing eeeeceeeeeeeeeeeeeeenteeeeeeeeeeees 10 Software instructions for setting the clock 10 Setting the time aeee 10 Reading the Clock 11 RTC tUNING sieccsecscscisccctciscccccceneceeccceessacceestexsccesics 11 Frequency tuning 0 ccccceeseeseeeeeeeeeeeenaees 11 References s sssessnnnsnennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nna 13 Legal information sss ssssensennnnennnnnnnnnnnnnnnennnnnnn 14 DefintionS 5 seca sok cesez ccsnanasteebbadcensaAhcssescteesacstes 14 DISCIaIMENS ariii shel ettinesieeie edd 14 Trademarks ceeecceeeeeeeeeseeeeeeesnneeeeeenaeeeenenaees 14 List Of FIQUIES ccseseeeeessteeeseneeeneeeeeensenenenseees 15 COMMONS sa sscaccice cessed cases cates cocerccceesnctvedecesccteccceice 16 Please be aware that important notices concerning this document and the product s d
3. 12 5 pF have largest production quantities Program the CAP_SEL bit in register Control_1 accordingly 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 Afippm 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 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 2 4 August 2014 11 of 16 NXP Semiconductors U M1 0788 User manual for I2 C bus RTC demo board OM13515 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 fast is then
4. Hardware set up 3 1 General requirements for the RTCs PCx85063A 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 l C bus operating up to 400 kHz Adjust the values of the pull up resistors to match the required interface speed keeping them as high impedance as possible for power savings reasons Ensure that the specified minimum requirements of the hold times tLow and tyich 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 Vop 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 CLKOUT UUL 100nF Fig 2 Interfacing to the microcontroller UM10788 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 2 4 August 2014 5 of 16 NXP Semiconductors U M1
5. address 4h Seconds 0000 0000 0 seconds clock integrity ok gt MSB OS 0 Minutes 0100 0101 45 min Hours 0010 0011 PM 3 Days 0001 0101 15 Weekdays 0000 0001 Monday 1 day of the week Month 0001 0010 December 12 month Year 0001 0100 20 14 I C bus P STOP condition UM10788 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 2 4 August 2014 10 of 16 NXP Semiconductors UM10788 User manual for I2 C bus RTC demo board OM13515 5 3 2 Reading the clock 6 RTC tuning Reading the clock 2 minutes after writing I C bus S Slave address 1010 0010 Register address 0000 0100 I C bus Sr Slave address 1010 0011 Read register 4 Minutes Hours Days Weekdays Month Year I C bus P START condition R W 1 read mode address pointer to Seconds register repeated start condition read mode e g 56 seconds clock integrity ok gt OS 0 e g 47 Minutes e g 23 PM 03h e g 15 15 e g 01 Monday e g 12 December e g 14 20 14 STOP condition 6 1 UM10788 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
6. 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 7 ATo tuning 20 frequency 32 768 deviation Af fo kHz ppm 20 60 compensation areas 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 Afoy Fig 7 Temperature averaged over application range 5 C to 45 C UM10788 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 2 4 August 2014 12 of 16 NXP Semiconductors U M1 0788 User manual for I2 C bus RTC demo board OM13515 7 References 1 AN11247 Improved timekeeping accuracy with PCF85063 PCF8523 and PCF2123 using an external temperature sensor 2 UM10301 User Manual for NXP Real Time Clocks PCF85x3 PCA8565 and PCF2123 PCA2125 3 UM10789 USB I C bus interface OM13518 with a GUI for the RTCs 4 PCF85063A Tiny Real Time Clock calendar with alarm function and C bus data sheet 5 PCF85063TP Tiny Real Time Clock calendar and C bus data sheet UM10788 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights res
7. document is subject to legal disclaimers NXP B V 2014 All rights reserved UM10788 User manual Rev 2 4 August 2014 7 of 16 NXP Semiconductors U M1 0788 User manual for I2C bus RTC demo board OM13515 4 Graphical User Interface with OM13518 USB I C bus dongle UM10788 4 1 USB I C dongle Details are described in the user manual UM10789 The OM13518 dongle is a ready to run module It creates a virtual COM port via an USB connection It provides three I C bus connections with 5 V option to power the application max 450 mA Power consumption module total lt 50 mA max 500 mA I C bus clock frequency 245 Hz 400 kHz USB driver for Windows Windows XP Windows 7 Windows 8 Size 50 mm X 40 mm X 15 mm DATA USB NXE usB PC OM13518 Fig 5 A Dongle OM13518 B connected to an evaluation board 4 2 Software GUI The software control via a GUI allows a fast start to communicate to the different circuits Aside from the detailed GUI pages for the Real Time Clocks a UNIVERSAL INTERFACE allows to communicate with any C bus device by entering directly the hex codes Example s A2 28 p Where s stands for the C START and p for the I2C STOP condition There are 2 GUI versions USB_I2C_GUI_85063TP for the PCF85063TP RTC with basic features no alarm facility USB_I2C_GUI_85063A forthe full featured PCx85063A RTC All information provided in this document is subjec
8. 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 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 sha
9. UM10788 User manual for I2C bus RTC demo board OM13515 Rev 2 4 August 2014 User manual Document information Info Content Keywords PCF85063 OM13515 evaluation demo board how to get started IC bus RTC Real Time Clock tuning Abstract User manual for the evaluation board OM13515 It uses the low power RTC PCF85063AT with I C bus interface NXP Semiconductors U M1 0788 User manual for I2 C bus RTC demo board OM13515 Revision history Rev Date Description v 2 20140804 Second revision v 1 20140620 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 UM10788 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 2 4 August 2014 2 of 16 NXP Semiconductors U M1 0788 User manual for I2 C bus RTC demo board OM13515 1 Introduction The PCx85063 are a family of CMOS Real Time Clocks RTC and calendar optimized for low power consumption Different features sets are available The OM13515 is the ideal evaluation demo board to use in the design phase of any project just power and C bus must be applied Separate demo boards and user manuals are available for RTC PCF85063TP PCF85063ATL OM11059A and UM11698 RTC with SPlI bus PCF85063BTL OM11059 and UM10699 2 Key featu
10. erved User manual Rev 2 4 August 2014 13 of 16 NXP Semiconductors UM10788 8 Legal information User manual for I2 C bus RTC demo board OM13515 8 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 8 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 liabili
11. escribed 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 4 August 2014 Document identifier UM10788
12. iconductors 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 UM10788 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 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
13. ll 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 8 3 Trademarks Notice All referenced brands product names service names and trademarks are property of their respective owners NXP B V 2014 All rights reserved User manual Rev 2 4 August 2014 14 of 16 NXP Semiconductors U M1 0788 User manual for I2 C bus RTC demo board OM13515 9 List of figures Fig 1 Block diagram of the PCX85063A eee 4 Fig 2 Interfacing to the microcontroller ee 5 Fig 3 Picture of demo board OM13515 eee 6 Fig 4 OM13515 circuit diagram e eee ee eeeeeeeeeee 7 Fig 5 A Dongle OM13518 B connected to an evaluation board 000 eeeeeeeeeeeeeeeereeeeeeneeeeeeaes 8 Fig 6 GUl page example Time Alarm settings 9 Fig 7 Temperature averaged over application range told OF ole Lo tad oer reece rrerrre S 12 UM10788 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 2 4 August 2014 15 of 16 NXP Semiconductors UM10788 10 Contents User manual for I2 C bus RTC demo board OM13515 2 1 3 1 3 2 4 1 4 2 5 1 5 2 5 3 5 3 1 5 3 2 6
14. 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 Interrupts can also be generated by the alarm facility the timer and the WatchDog At address byte 03h a general purpose RAM byte is ideal to store temporary information All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 2 4 August 2014 9 of 16 NXP Semiconductors U M1 0788 User manual for I2 C bus RTC demo board OM13515 5 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 The RTC can stay switched on all the time There is no need to restart or reset the clock 5 3 Software instructions for setting the clock 5 3 1 Setting the time Setting the clock to 3 45 pm December 15 2014 I C bus S START condition Slave address 1010 0010 address pointer to status word 0 Register address 0000 0000 address pointer to status word 0 Status word 0 0000 0010 set 12 hour mode and select option for 7 pF quartz I C bus Sr Repeated START condition Slave address 1010 0010 R W 0 write mode Register address 0000 0100 address pointer to Seconds register
15. res UM10788 2 1 There are four RTC variants of the PCF85063x RTC with I C bus PCF85063AT PCF85063ATT enhanced functionality with I C bus interface PCA85063ATT enhanced functionality with I C bus interface AEC Q100 qualified automotive grade PCF85063ATL enhanced functionality with I C bus interface with clock enable input PCF85063TP basic functionality with I C bus interface PCx85063AT PCF85063ATT The PCx85063A is a Real Time Clock with very small form factor counting seconds minutes hours days weekdays months and years e Electronic oscillator tuning e RAM 1 byte e Package PCF85063AT SO8 PCF85063ATT TSSOP8 PCA85063ATT TSSOP8 automotive grade 40 C to 105 C e Alarm control e Timer e WatchDog Interrupt every 30 s or 60 s alarm timer WatchDog Interface 400 kHz C bus All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 2 4 August 2014 3 of 16 NXP Semiconductors U M1 0788 User manual for I2 C bus RTC demo board OM13515 CLKOUT INT Fig 1 Block diagram of the PCx85063A UM10788 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 2 4 August 2014 4 of 16 NXP Semiconductors U M1 0788 User manual for I2 C bus RTC demo board OM13515 3
16. t to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 2 4 August 2014 8 of 16 NXP Semiconductors U M1 0788 User manual for I2 C bus RTC demo board OM13515 Verbindung Ic coms x Disconnect FC Address OxA2 z Ne RTC GUI V01 General USBA2C Commands Registers Time Aam Register Readback Demoboard Time and Alarm Time and Alarm Register Settings 24 Hour v Display Mode TIME AM PM HOUR MIN Set AM gt execute SeETTIME Beek L lt READ ESTART N ALARM Enable Vi HR VMN F SC V wpY F DY Set 00 00 00 00 00 Curent 0 oO oO SUN 00 Monitor bus transmission 01 09 09 17 06 07 14 100 00 00 00 00 Fig 6 GUl page example Time Alarm settings 5 Software set up UM10788 5 1 Functionality The RTC PCx85063A is controlled via a standard Fast Mode C bus interface 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 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 number of days per
17. ty 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 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 Sem
Download Pdf Manuals
Related Search