PCF85263A Tiny Real-Time Clock/calendar with alarm function, battery switch-over, time stamp input, and I2C-bus Rev. 3 — 16 January 2015 Product data sheet 1. General description The PCF85263A is a CMOS1 Real-Time Clock (RTC) and calendar optimized for low power consumption and with automatic switching to battery on main power loss. The RTC can also be configured as a stop-watch (elapsed time counter). Three time log registers triggered from battery switch-over as well as input driven events.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus White goods Elapsed time counter Network powered devices Battery backed up systems Data loggers Digital voice recorders Mobile equipment Accurate high duration timer 4. Ordering information Table 1. Ordering information Type number Package Name Description Version PCF85263AT SO8 plastic small outline package; 8 leads; body width 3.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 6. Block diagram $ODUP FRQWURO 7+ VHFRQGV E\WH 5$0 6HFRQGV 0LQXWHV 57& 6WRSZDWFK +RXUV +RXUV [[[[ :HHNGD\V +RXUV [[ [[ 'D\V +RXUV [[[[ 0RQWKV
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 7. Pinning information 7.1 Pinning 3&) $7 26&, 9'' 26&2 ,17$ &/. 9%$7 6&/ 966 6'$ DDD For mechanical details, see Figure 44 on page 79. Fig 2. Pin configuration for PCF85263AT (SO8) WHUPLQDO LQGH[ DUHD 26&, 9'' 26&2 9%$7 76 &/. ,17% ,17$ &/. 3&) $7/ &/.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 26&, 9'' 26&2 9%$7 76 &/. ,17% ,17$ &/. 3&) $77 &/. 6&/ 966 6'$ DDD For mechanical details, see Figure 47 on page 82. Fig 5. PCF85263A Product data sheet Pin configuration for PCF85263ATT1 (TSSOP10) All information provided in this document is subject to legal disclaimers. Rev. 3 — 16 January 2015 © NXP Semiconductors N.V. 2015. All rights reserved.
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PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8. Functional description The PCF85263A contains 8-bit registers for time information, for timestamp information and registers for system configuration. Included is an auto-incrementing register address, an on-chip 32.768 kHz oscillator with integrated capacitors, a frequency divider which provides the source clock for the Real-Time Clock (RTC) and calender, and an I2C-bus interface with a maximum data rate of 400 kbit/s.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus The 100th seconds, seconds, minutes, hours, days, months, and years as well as the corresponding alarm registers are all coded in Binary Coded Decimal (BCD) format. When one of the RTC registers is read, the contents of all time counters are frozen. Therefore, faulty reading of the clock and calendar during a carry condition is prevented. 8.1 Registers organization overview 8.1.
NXP Semiconductors PCF85263A Product data sheet xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx 8.1.1.
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NXP Semiconductors PCF85263A Product data sheet xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx 8.1.1.
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PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.2 RTC mode time and date registers RTC mode is enabled by setting RTCM = 0. These registers are coded in the BCD format to simplify application use. Default state is: Time — 00:00:00.00 Date — 2000 01 01 Weekday — Saturday Monitor bits — OS = 1, EMON = 0 Table 8. Time and date registers in RTC mode (RTCM = 0) Bit positions labeled as - are not implemented and return 0 when read.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 9. BCD coding Value in decimal Upper-digit (ten’s place) Digit (unit place) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 00 0 0 0 0 0 0 0 0 01 0 0 0 1 0 0 0 1 02 0 0 1 0 0 0 1 0 : : : : : : : : : 09 1 0 0 1 1 0 0 1 10 0 0 0 0 0 0 0 0 : : : : : : : : : 98 1 0 0 1 1 0 0 0 99 1 0 0 1 1 0 0 1 8.2.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.2.4 Definition of weekdays Definition may be reassigned by the user. Table 10. Weekday assignments Day Bit 2 1 0 Sunday 0 0 0 Monday 0 0 1 Tuesday 0 1 0 Wednesday 0 1 1 Thursday 1 0 0 Friday 1 0 1 Saturday 1 1 0 8.2.5 Definition of months Table 11.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.2.6 Setting and reading the time in RTC mode Figure 10 shows the data flow and data dependencies starting from the 100 Hz clock tick. +] WLFN 7+B6(&21' +] WLFN 7+ 6(&21'6 0,187(6 B +2856 /($3 <($5 &$/&8/$7,21 '$<6 :((.'$< 0217+6 <($56 DDD Fig 10.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus • • • • • • • • • • write data (clear prescaler, A4h) write data (100th seconds, 00h) write data (Hours, 14h) write data (Minutes, 23h) write data (Seconds, 19h) I2C START condition I2C slave address + write (A2h) register address (2Eh) write data (clear STOP, 00h). Time starts counting from this point I2C STOP condition 8.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus When reading or writing the time it is very important to make a read or write access in one go, that is, setting or reading 100th_seconds through to HR_00_xx_xx should be made in one single access. Failing to comply with this method could result in the time becoming corrupted.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 13. Alarm1 and alarm2 registers in RTC mode coded in BCD (RTCM = 0) Bit positions labeled as - are not implemented.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 14. Alarm_enables- alarm enable control register (address 10h) bit description …continued Bit Symbol 1 MIN_A1E Value minute alarm1 enable 0[1] 1 0 [1] 8.4.1.3 Description SEC_A1E disabled enabled second alarm1 enable 0[1] disabled 1 enabled Default value. Alarm1 and alarm2 function in RTC mode The registers at addresses 08h through 0Ch contain alarm1 information.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus H[DPSOH FKHFN QRZ VLJQDO 6(&B$ ( 6(&B$ ( 6(&21' $/$50 6(&21' 7,0( 0,1B$ ( 0,187( $/$50 0,187( 7,0( +5B$ ( +285 $/$50 VHW DODUP IODJ $ ) +285 7,0( '$
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.4.2 Alarms in stop-watch mode In stop-watch mode, Alarm 1 can be configured from seconds to 999999 hours. Alarm 2 operates on minutes up to 9999 hours. 8.4.2.1 Alarm1 and alarm2 registers in stop-watch mode Setting the time for alarm1 and alarm2: Only the information which is relevant for the alarm condition must to be programmed. The unused parts are ignored. Table 15.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 16. Alarm_enables- alarm enable control register (address 10h) bit description …continued Bit Symbol Value 2 HR_XX_XX_00_A1E tens of hour alarm1 enable 0[1] 1 1 0 [1] 8.4.2.3 Description MIN_A1E disabled enabled minute alarm1 enable 0[1] disabled 1 enabled SEC_A1E second alarm1 enable 0[1] disabled 1 enabled Default value.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus H[DPSOH FKHFN QRZ VLJQDO 6(&B$ ( 6(&21' $/$50 6(&B$ ( 6(&21' 7,0( 0,1B$ ( 0,187( $/$50 0,187( 7,0( +5B[[B[[B B$ ( +5B[[B[[B $/$50 VHW DODUP IODJ $ ) [[B[[B +285 7,0( +5B[[B B[[B$ ( +5B[[B B[[ $/$50 [[B B[[ +285 7,0( +5B B[[B[[B$ ( +5B B[[B[[ $/$50 B[[B[[ +285 7,0( H[DPSOH FKHFN QRZ VLJQDO 0,1B$ ( 0,187( $/$50 0,1B$ ( 0,187( 7,0( +5B[[B B$ ( +5B[[B $/$50 VHW DODUP IODJ $ )
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus The assertion of flags A1F or A2F can be used to generate an interrupt at the pins INTA and INTB. The interrupt may be generated as a pulse signal every time the time increments to match the alarm setting or as a permanently active signal which follows the condition of bit A1F and/or A2F. See Section 8.9 on page 38 for interrupt control. A1F and A2F remain set until cleared by command.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Remark: Note that all timings are generated from the 32.768 kHz oscillator and are based on the assumption that there is 0 ppm deviation. Deviation in oscillator frequency results in deviation in timings. This is not applicable to interface timing. The WatchDog counts down from a software-loaded 5-bit binary value, WDR[4:0], in register WatchDog. Loading the counter with 0 stops the WatchDog.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus FRXQWGRZQ YDOXH :'5 :DWFK'RJ FORFN FRXQWHU :') ,17$ RU ,17% GXUDWLRQ RI :DWFK'RJ SHULRG DIWHU VWDUW PD\ UDQJH IURP :'5 WR :'5 FRXQWV DDD Fig 15. WatchDog single shot mode 8.5.1.3 WatchDog interrupts The generation of interrupts from the WatchDog functions is controlled via the WatchDog interrupt enable bits; WDIEA and WDIEB.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Timestamps work in both RTC and stop-watch mode. During battery operation, the mechanical switch detector may also be used to trigger the timestamp. The timestamp registers are read only and cannot be written. It is possible to set all three registers to 0 with the CTS instruction in the Resets register (Section 8.15 on page 58).
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 20.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus VRXUFH RI SRZHU 9'' SRZHU EDWWHU\ SRZHU 9'' SRZHU EDWWHU\ SRZHU 9'' SRZHU HYHQW WLPH W W W W W HYHQW W\SH )% /% /9 )% /% /9 /% WLPHVWDPS IODJ 765 ) IODJ FOHDUHG E\ LQWHUIDFH 765 VHW WR ILUVW WLPH VZLWFK WR EDWWHU\ )% 765 W QR FKDQJH 765 W QR FKDQJH QR FKDQJH 765 VHW WR ODVW WLPH VZLWFK WR 9'' /9 QR FKDQJH 765 W QR FKDQJH 765 W QR FKDQJH DDD Fig 17.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 21. Timestamp registers in RTC mode (RTCM = 0) Bit positions labeled as - are not implemented and return 0 when read.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 22. Timestamp registers in stop-watch mode (RTCM = 1) Bit positions labeled as - are not implemented and return 0 when read.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.8 Offset register The PCF85263A incorporates an offset register (address 24h) which can be used to implement several functions, such as: • Accuracy tuning • Aging adjustment • Temperature compensation Table 23.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus The correction is made by adding or subtracting clock correction pulses, thereby changing the period of a single second but not by changing the oscillator frequency. It is possible to monitor when correction pulses are applied. See Section 8.8.4. 8.8.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 27.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.8.3 Offset calibration workflow The calibration offset has to be calculated based on the time. Figure 19 shows the workflow how the offset register values can be calculated: 0HDVXUH WKH IUHTXHQF\ RQ SLQ &/.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus GHYLDWLRQ DIWHU FRUUHFWLRQ LQ 2))0 SSP GHYLDWLRQ DIWHU FRUUHFWLRQ LQ 2))0 SSP PHDVXUHG FDOFXODWHG GHYLDWLRQ SSP DDD With the offset calibration an accuracy of 1 ppm (0.5 offset per LSB) can be reached (see Table 25). 1 ppm corresponds to a time deviation of 0.0864 seconds per day.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 28. INTA and INTB interrupt control bits Bit 7 6 5 4 3 2 1 0 A2IEA TSRIEA BSIEA WDIEA TSRIEB BSIEB WDIEB INTA_enable - INTA pin enable control (address 29h) Symbol ILPA PIEA OIEA A1IEA INTB_enable - INTB pin enable control (address 2Ah) Symbol ILPB Table 29.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus • • • • • • for periodic interrupts, every time a period has elapsed for offset correction, every time a correction pulse is initiated for alarms, every time the time increments to match the alarm time for timestamps, every time a register updates for battery switch, every time the IC switches to or from battery for WatchDog, every time the counter reaches the end of its count The interrupt signal goes active coincident
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PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.10 Oscillator register Table 30. Oscillator - oscillator control register (address 25h) bit description Bit 7 6 5 4 3 2 1 0 Symbol CLKIV OFFM 12_24 LOWJ OSCD[1:0] CL[1:0] Section Section 8.16 Section 8.8 Section 8.10.3 Section 8.10.4 Section 8.10.5 Section 8.10.6 8.10.1 CLKIV: invert the clock output Table 31.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Oscillator circuits suffer from jitter. In particular, ultra low-power oscillators like the one used in the PCF85263A are optimized for power and not jitter. By setting the LOWJ bit, the jitter performance can be improved at the cost of power consumption. 8.10.5 OSCD[1:0]: quartz oscillator drive control Table 34.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.11 Battery switch register This register configures the battery switch-over mode. Associated with the battery switch-over is the battery switch flag (BSF) in the Flags register (Section 8.14 on page 57). Whenever the IC switches to battery operation, the flag is set. The flag can only be read when operating from VDD power, however an interrupt pulse or static LOW signal can be generated whenever switching to battery.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.11.2 BSRR: battery switch internal refresh rate Table 39. BSRR bit - battery switch control (address 26h) bit description Bit Symbol 3 BSRR [1] Value Description battery switch refresh rate 0[1] low 1 high Default value. Non-user bit. Recommended to leave set at default. 8.11.3 BSM[1:0]: battery switch mode Table 40.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 9'' VZLWFKLQJ SRLQW K\VWHUHVLV 9'' GHFUHDVLQJ 9'' LQFUHDVLQJ PD[ 9WK ORZ 9WK KLJK W\S PLQ W EDWWHU\ RSHUDWLRQ 57& SRZHU VXSSO\ VZLWFK WR 9'' VZLWFK WR EDWWHU\ 9'' RSHUDWLRQ 9'' RSHUDWLRQ DDD Fig 23. Threshold voltage switching hysteresis 8.11.3.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.11.3.2 Switching at the VBAT level, BSM[1:0] = 01 9'' 9%$7 LQWHUQDO SRZHU VXSSO\ 9WK 9'' 9 FOHDUHG YLD LQWHUIDFH %6) ,17$ , & EDWWHU\ PRGH LQGLFDWLRQ LQWHUIDFH DFWLYH LQWHUIDFH LQDFWLYH LQWHUIDFH DFWLYH DDD Fig 25. Switching at VBAT PCF85263A Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 16 January 2015 © NXP Semiconductors N.V. 2015.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.11.3.3 Switching at the higher of VBAT or Vth level, BSM[1:0] = 10 With this mode switching takes place when VDD falls below the higher of Vth or VBAT. In Figure 26, an example is given where the threshold is set to 1.5 V and a single cell battery is connected to VBAT. In this example, switching to the battery voltage takes place when VDD falls below Vth.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.11.3.4 Switching at the lower of VBAT and Vth level, BSM[1:0] = 11 With this mode switching takes place when VDD falls below the lower of Vth or VBAT. In Figure 27, an example is given where the threshold is set to 1.5 V and a single cell battery is connected to VBAT. In this example, switching to the battery voltage takes place when VDD falls below VBAT.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus When enabled, interrupts are triggered every time the battery switch circuit switches to either battery or to VDD and even if the BSF is not cleared, an interrupt pulse can be generated. In addition, the INTA pin can be configured as a battery mode indicator (INTAPM[1:0] = 00). See Section 8.12.6 on page 52.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.12.3 TSL: TS pin level sense Table 46. TSL bit - Pin_IO control register (address 27h) Bit Symbol 5 TSL [1] Value Description TS pin input sense 0[1] active HIGH 1 active LOW Default value. The active state of the TS pin can be defined for use as a timestamp trigger and/or as stop control for the time counting. Active HIGH implies a transition from logic 0 to logic 1 is active.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.12.4.2 TS pin output mode; CLK It is possible to output a clock frequency on the TS pin. Clock frequency is selected with the COF[2:0] bits in the Function register (Section 8.13 on page 54). The output is push-pull. No output is available when on VBAT. When on VBAT the output is Hi-Z. 8.12.4.3 TS pin disabled When disabled the pin is Hi-Z and can be left floating. 8.12.5 TSIM: TS pin input type control Table 48.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus The INTA pin can be used to output three different signals. EDWWHU\ PRGH ,17$ &/. FORFN GDWD ,17$ GDWD DDD Fig 29. INTA pin 8.12.6.1 INTAPM[1:0]: INTA The primary function of the INTA pin is to output INTA data. INTA data is controlled by the bits of the INTA_enable register (see Table 29 on page 39). The output is active LOW with an open-drain output. The output is available during VDD and VBAT operation.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.13 Function register Table 51. Function - chip function control register (address 28h) bit description Bit 7 6 5 4 3 2 1 0 Symbol 100TH PI[1:0] RTCM STOPM COF[2:0] Section Section 8.13.1 Section 8.13.2 Section 8.13.3 Section 8.13.4 Section 8.13.5 8.13.1 100TH: 100th seconds mode Table 52.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.13.3 RTCM: RTC mode Table 54. RTCM bit - Function control register (address 28h) Bit Symbol 4 RTCM [1] Value Description RTC mode 0[1] real-time clock mode 1 stop-watch mode Default value. The RTC mode is used to control how the time is counted. When configured as a classic RTC, then time is counted from 100th seconds to years. In stop-watch mode, time is counted from 100th seconds to 999999 hours.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.13.5 COF[2:0]: Clock output frequency Table 58. Bit COF[2:0] bits - Function control register (address 28h) Symbol Value Frequency selection (Hz) COF[2:0] 000[1] 32768 32768 32768 001 16384 16384 16384 010 8192 8192 8192 011 4096 4096 4096 100 2048 2048 2048 101 1024 1024 1024 110 1 1 1 111 static LOW static LOW Hi-Z CLK pin 2 to 0 [1] TS pin INTA pin Default value.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.14 Flags register Table 60. Bit Flags - Flag status register (address 2Bh) bit description Symbol 7 PIF Flag name Value Description Periodic Interrupt Flag Section 8.13.2 on page 54 0[1] read: periodic interrupt flag inactive write: periodic interrupt flag is cleared 1 read: periodic interrupt flag active write: periodic interrupt flag remains unchanged 6 A2F Alarm2 Flag Section 8.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.15 Reset register Table 61. Reset - software reset control (address 2Fh) bit description Bit 7 6 5 4 3 2 1 0 Symbol CPR 0 1 0 SR 1 0 CTS Section Section 8.15.2 Section 8.15.1 Section 8.15.3 For a • software reset (SR), 00101100 (2Ch) must be sent to register Reset (address 2Fh).
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 62. Registers reset values Registers labeled as - remain unchanged.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 62. Registers reset values …continued Registers labeled as - remain unchanged. Address Register name Bit 7 6 5 4 3 2 1 0 2Ch RAM_byte 0 0 0 0 0 0 0 0 2Dh WatchDog 0 0 0 0 0 0 0 0 2Fh Reset 0 0 0 0 0 0 0 0 8.15.2 CPR: clear prescaler To set the time for RTC mode accurately or to clear the time in stop-watch mode, the clear prescaler instruction is needed.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 26&,//$725 6723 '(7(&725 +] 26&,//$725 GLY +] VHWWLQJ WKH 26 IODJ 35(6&$/(5 5(6(7 +] WLFN +] WLFN &35 VWRS DDD (1) stop is a combination of STOP register bit and the TS pin when programmed for stop control. Fig 31. CPR and STOP bit functional diagram The stop signal blocks the 8.192 kHz clock from generating system clocks and freezes the time.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus • end I2C access The flow for resetting time in stop-watch mode is: • • • • • • PCF85263A Product data sheet start an I2C access at register 2Eh set STOP bit send CPR instruction address counter will roll over to address 00h set time to 000000:00:00.00 end I2C access All information provided in this document is subject to legal disclaimers. Rev. 3 — 16 January 2015 © NXP Semiconductors N.V. 2015.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 9. I2C-bus interface The I2C-bus is for bidirectional, two-line communication between different ICs. The two lines are a Serial DAta line (SDA) and a Serial CLock line (SCL). Both lines must be connected to a positive supply via a pull-up resistor. Data transfer may be initiated only when the bus is not busy. Both data and clock lines remain HIGH when the bus is not busy.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 9.2 START and STOP conditions A HIGH-to-LOW transition of the data line while the clock is HIGH is defined as the START condition - S. A LOW-to-HIGH transition of the data line while the clock is HIGH is defined as the STOP condition - P (see Figure 34). 9.3 Acknowledge Each byte of 8 bits is followed by an acknowledge cycle. An acknowledge is defined as logic 0. A not-acknowledge is defined as logic 1.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 10. Interface protocol The PCF85263A uses the I2C interface for data transfer. Interpretation of the data is determined by the interface protocol. 10.1 Write protocol After the I2C slave address is transmitted, the PCF85263A requires that the register address pointer is defined. It can take the value 00h to 2Fh.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus The master must indicate that the last byte has been read by generating a not-acknowledge after the last read byte. 10.3 Slave addressing 10.3.1 Slave address One I2C-bus slave address (1010 001) is reserved for the PCF85263A. The entire I2C-bus slave address byte is shown in Table 65. Table 65.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 11. Application design-in information In this application, stop-watch mode is used to implement an elapsed time counter. The TS pin is used with a mechanical switch to start and stop the time. Each time the time is stopped, timestamp2 is loaded with the current time and an interrupt is generated on the INTA pin.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 66. Application configuration Register Section Bit(s) State Comment Pin_IO Section 8.12 TSPM[1:0] 11 TS pin in input mode Pin_IO Section 8.12 TSIM 1 select mechanical switch mode Pin_IO Section 8.12 TSL 1 TS pin input is active LOW Function Section 8.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus INTA was configured to generate an interrupt when TSR2 loads a new time, hence an interrupt pulse is seen on INTA. • At t5, SW1 is opened. No action is taken by the IC. • At t6, SW1 is open. The internal pull-up is active and the TS pin raises to vdd_int level. The HIGH level is sampled and causes the stop signal to be released and time starts counting again. 12. Internal circuitry 3&) $ 9'' 26&, ,17$ 26&2 &/.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 14. Limiting values Table 67. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol Parameter VDD Min Max Unit supply voltage 0.5 +6.5 V IDD supply current 50 +50 mA VBAT battery supply voltage 0.5 +6.5 V IBAT battery supply current 50 +50 mA VI input voltage 0.5 +6.5 V VO output voltage 0.5 +6.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 15. Characteristics Table 68. Characteristics VDD = 0.9 V to 5.5 V; VSS = 0 V; Tamb = 40 C to +85 C; fosc = 32.768 kHz; quartz Rs = 60 k; CL = 7 pF; all registers in reset state; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit supply voltage interface inactive; fSCL = 0 Hz [1] 0.9 - 5.5 V [1] interface active; fSCL = 400 kHz 1.8 - 5.5 V battery supply voltage [1] 0.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 68. Characteristics …continued VDD = 0.9 V to 5.5 V; VSS = 0 V; Tamb = 40 C to +85 C; fosc = 32.768 kHz; quartz Rs = 60 k; CL = 7 pF; all registers in reset state; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit IOH HIGH-level output current output source current; VOH = 2.9 V; VDD = 3.3 V; on pin CLK, TS 1 3 - mA IOL LOW-level output current output sink current; VOL = 0.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus DDD ,'' $ )6&/ N+] Tamb = 25 C; CLKOUT disabled. (1) VDD = 5.0 V. (2) VDD = 3.3 V. Fig 38. Typical IDD with respect to fSCL DDD ,'' Q$ 7DPE & CL(itg) = 7 pF; CLKOUT disabled; battery switched on. (1) VDD = 5 V. (2) VDD = 3.3 V. Fig 39.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus DDD ,'' $ 9'' 9 Tamb = 25 C; fCLKOUT = 32768 Hz. (1) 47 pF CLKOUT load. (2) 22 pF CLKOUT load. (3) 0 pF CLKOUT load. DDD ,'' Q$ 9'' 9 Tamb = 25 C; CLKOUT disabled. (1) CL(itg) = 12.5 pF. (2) CL(itg) = 7 pF. (3) CL(itg) = 6 pF. Fig 40.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus DDD ǻIRVF IRVF SSP 9'' 9 Tamb = 25 C. (1) CL(itg) = 12.5 pF. (2) CL(itg) = 6 pF. (3) CL(itg) = 7 pF. Fig 41. Oscillator frequency variation with respect to VDD PCF85263A Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 16 January 2015 © NXP Semiconductors N.V. 2015. All rights reserved.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 69. I2C-bus characteristics VDD = 1.8 V to 5.5 V; VSS = 0 V; Tamb = 40 C to +85 C; fosc = 32.768 kHz; quartz Rs = 60 k; CL = 7 pF; unless otherwise specified. All timing values are valid within the operating supply voltage and temperature range and referenced to VIL and VIH with an input voltage swing of VSS to VDD[1].
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus SURWRFRO 67$57 FRQGLWLRQ 6 W68 67$ ELW 06% $ W/2: ELW $ W+,*+ I ELW 5 : DFNQRZOHGJH $ 6723 FRQGLWLRQ 3 6&/ 6&/ W%8) WI WU 6'$ W68 '$7 W+' 67$ W+' '$7 W9' '$7 W9' $&. W68 672 DDD Fig 42. I2C-bus timing diagram; rise and fall times refer to 30 % and 70 % 16. Application information 9'' Q) 6'$ 0$67(5 75$160,77(5 5(&(,9(5 6&/ Q) 9%$7 9'' &/.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 17. Test information 17.1 Quality information UL Component Recognition This (component or material) is Recognized by UL. Representative samples of this component have been evaluated by UL and meet applicable UL requirements. PCF85263A Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 16 January 2015 © NXP Semiconductors N.V. 2015. All rights reserved.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 18.
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PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 19. Handling information All input and output pins are protected against ElectroStatic Discharge (ESD) under normal handling. When handling Metal-Oxide Semiconductor (MOS) devices ensure that all normal precautions are taken as described in JESD625-A, IEC 61340-5 or equivalent standards. 20. Packing information For tape and reel packing information, please see: • • • • Ref. 10 “SOT96-1_118” Ref. 11 “SOT505-1_118” Ref.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus • • • • • • Board specifications, including the board finish, solder masks and vias Package footprints, including solder thieves and orientation The moisture sensitivity level of the packages Package placement Inspection and repair Lead-free soldering versus SnPb soldering 21.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Moisture sensitivity precautions, as indicated on the packing, must be respected at all times. Studies have shown that small packages reach higher temperatures during reflow soldering, see Figure 48. temperature maximum peak temperature = MSL limit, damage level minimum peak temperature = minimum soldering temperature peak temperature time 001aac844 MSL: Moisture Sensitivity Level Fig 48.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 22. Footprint information î î VROGHU ODQGV RFFXSLHG DUHD SODFHPHQW DFFXUDF\ 'LPHQVLRQV LQ PP VRW BIU Fig 49. Footprint information for reflow soldering of SOT96-1 (SO8), PCF85263AT PCF85263A Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 16 January 2015 © NXP Semiconductors N.V. 2015.
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PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus VROGHU ODQGV RFFXSLHG DUHD 'LPHQVLRQV LQ PP VRW BIU Fig 51. Footprint information for reflow soldering of SOT505-1 (TSSOP8),PCF85263ATT PCF85263A Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 3 — 16 January 2015 © NXP Semiconductors N.V. 2015. All rights reserved.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 627 )RRWSULQW LQIRUPDWLRQ IRU UHIORZ VROGHULQJ RI 76623 SDFNDJH +[ 3 +\ *\ VROGHU ODQG RFFXSLHG DUHD 'LPHQVLRQV LQ PP *\ +\ +[ 3 ,VVXH GDWH VRW BIU Fig 52. Footprint information for reflow soldering of SOT552-1 (TSSOP10), PCF85263ATT1 PCF85263A Product data sheet All information provided in this document is subject to legal disclaimers. Rev.
xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx NXP Semiconductors PCF85263A Product data sheet 23. Appendix 23.1 Real-Time Clock selection Table 72.
xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx Selection of Real-Time Clocks …continued Alarm, Timer, Interrupt Interface IDD, Battery Timestamp, Watchdog
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 24. Abbreviations Table 73.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 26. Revision history Table 74. Revision history Document ID Release date Data sheet status Change notice Supersedes PCF85263A v.3 20150116 Product data sheet - PCF85263A v.2 Modifications: • • • Corrected Figure 35, Section 2 Corrected Vth values in Table 68 Added ESD values of PCF85263AT in Table 67 PCF85263A v.2 20140710 Product data sheet - PCF85263A v.1 PCF85263A v.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 27. Legal information 27.1 Data sheet status Document status[1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 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. Non-automotive qualified products — Unless this data sheet expressly states that this specific NXP Semiconductors product is automotive qualified, the product is not suitable for automotive use.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 29. Tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Table 15. Table 16. Table 17. Table 18. Table 19. Table 20. Table 21. Table 22. Table 23. Table 24. Table 25. Table 26. Table 27. Table 28. Table 29. Table 30. Table 31. Table 32. Table 33. Table 34. Table 35. Ordering information . . . . . . . . . . . . . . . . . . . . .
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus Table 71. Table 72. Table 73. Table 74. Lead-free process (from J-STD-020D) . . . . . .84 Selection of Real-Time Clocks . . . . . . . . . . . . .90 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . .92 Revision history . . . . . . . . . . . . . . . . . . . . . . . .93 PCF85263A Product data sheet All information provided in this document is subject to legal disclaimers. Rev.
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 30. Figures Fig 1. Fig 2. Fig 3. Fig 4. Fig 5. Fig 6. Fig 7. Fig 8. Fig 9. Fig 10. Fig 11. Fig 12. Fig 13. Fig 14. Fig 15. Fig 16. Fig 17. Fig 18. Fig 19. Fig 20. Fig 21. Fig 22. Fig 23. Fig 24. Fig 25. Fig 26. Fig 27. Fig 28. Fig 29. Fig 30. Fig 31. Fig 32. Fig 33. Fig 34. Fig 35. Fig 36. Fig 37. Fig 38. Fig 39. Fig 40. Fig 41. Fig 42. Fig 43. Fig 44. Fig 45. Fig 46. Fig 47. Fig 48. Block diagram of PCF85263A . . . . . .
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 31. Contents 1 2 3 4 4.1 5 6 7 7.1 7.2 8 8.1 8.1.1 8.1.1.1 8.1.1.2 8.1.2 8.2 8.2.1 8.2.2 8.2.3 8.2.4 8.2.5 8.2.6 8.3 8.3.1 8.4 8.4.1 8.4.1.1 8.4.1.2 8.4.1.3 8.4.2 8.4.2.1 8.4.2.2 8.4.2.3 8.4.3 8.5 8.5.1 8.5.1.1 8.5.1.2 8.5.1.3 8.6 8.7 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features and benefits . . . . . . . . . . . . . . . . . . . . 1 Applications . . . . . . . . . . . . . . . . . . . . . . . .
PCF85263A NXP Semiconductors Tiny RTC with alarm, battery switch-over, and I2C-bus 8.14 Flags register . . . . . . . . . . . . . . . . . . . . . . . . . 57 8.15 Reset register . . . . . . . . . . . . . . . . . . . . . . . . . 58 8.15.1 SR - Software reset . . . . . . . . . . . . . . . . . . . . 58 8.15.2 CPR: clear prescaler . . . . . . . . . . . . . . . . . . . 60 8.15.3 CTS: clear timestamp . . . . . . . . . . . . . . . . . . 60 8.16 Stop_enable register. . . . . . . . . . . . . . . . . . . .