?2012 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-31 v.08 page 1 of 9 spi real-time clock/calendar with integrated backup power cbc34123 enerchip? rtc features ? integrated rechargeable solid state battery with power-fail detect and automatic switchover, pro - viding greater than 30 hours of rtc backup ? smallest commercially available rtc with inte - grated backup power in compact 5mm x 5mm 1.4mm qfn package ? temperature compensated charge control ? integrated enerchip? recharged at vdd > 2.5v ? smt assembly - lead-free refow solder tolerant ? real time clock provides year, month, day, week - day, hours, minutes, and seconds based on a 32.768 khz quartz crystal ? resolution: seconds to years ? watchdog functionality ? freely programmable timer and alarm with inter - rupt capability ? 3-line spi-bus with separate, but combinable data input and output ? integrated oscillator load capacitors for c l = 7 pf ? internal power-on reset (por) ? open-drain interrupt and clock output pins ? programmable offset register for frequency adjustment ? eco-friendly, rohs compliant - tested general description the enerchip rtc cbc34123-m5c combines a real-time clock (rtc) and calendar optimized for low power applications with an integrated rechargeable solid state backup battery and all power management functions. the enerchip rtc ensures a seamless transition from main power to backup power in the event of power loss. the integrated power management circuit ensures thousands of charge-discharge cycles from the integrated enerchip and manages battery charging, discharge cutoff, power switchover, and temperature compensation to maximize the service life of the device. the cbc34123 provides greater than 30 hours of backup time in the event main power is interrupted. typical blackout times are less than 4 hours. the enerchip has extremely low self-discharge, recharges quickly, is non-fammable, and rohs-compliant. the enerchip is charged automatically anytime vdd is above 2.5v. data is transferred serially via a serial peripheral interface (spi-bus) with a maximum data rate of 6.25 mbit/s. alarm and timer functions provide the option to generate a wake-up signal on an interrupt pin. an offset register allows fne tuning of the clock. 5mm x 5mm x 1.4mm 16-qfn package applications ? wireless sensors and rfid tags and other powered, low duty cycle applications. ? power bridging to provide uninterruptible rtc function during exchange of main batteries. ? consumer appliances that have real-time clocks; provides switchover power from main supply to backup battery. ? business and industrial systems such as: network routers, point-of-sale terminals, single- board computers, test equipment, multi-function printers, industrial controllers, and utility meters. ? time keeping application ? battery powered devices ? metering ? high duration timers ? daily alarms ? low standby power applications preliminary figure 1: cbc34123 pin-out diagram
?2012 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-31 v.08 page 2 of 9 figure 3: internal schematic of cbc34123 enerchip rtc figure 2: cbc34123 block diagram with registers timer function timer _ clkout 0 eh offset function offset _ register 0 dh countdown _ timer 0 fh control control _ 1 00 h control _ 2 01 h time seconds 02 h minutes 03 h hours 04 h days 05 h weekdays 06 h months 07 h years 08 h alarm function minute _ alarm 09 h hour _ alarm 0 ah day _ alarm 0 bh weekday _ alarm 0 ch spi interface watch dog oscillator 32 . 768 khz monitor divider clockout interrupt ce scl sdi sdo osci osco poweron reset int clkoe clkout vdd vss test enerchip and charger en reset vec vchg 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 cbc34123 enerchip? rtc preliminary
?2012 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-31 v.08 page 3 of 9 pin number label description 1 osco oscillator output; high-impedance node; minimize wire length between quartz and package 2 test test pin; not user accessible; connect to vss or leave foating (internally pulled down) 3 int/ interrupt output (open-drain; active low) 4 ce chip enable input (active high) with internal pull down 5 vss ground 6 vchg 4.1v (typical) charging source - connect to vbat and/or optional enerchip(s) 7 vec positive terminal of integrated thin flm battery - connect to vchg and noth - ing else 8 sdo serial data output, push-pull; high-impedance when not driving; can be con - nected to sdi for single wire data line 9 sdi serial data input; may foat when ce is inactive 10 scl serial clock input; may foat when ce is inactive 11 clkoe clkout enable or disable pin; enable is active high; connect to vss for low power operation 12 clkout clock output (open-drain) 13 vdd supply voltage; positive or negative steps in vdd can affect oscillator perfor - mance; recommend 100nf decoupling close to the device (see fig. 30) 14 reset/ output signal indicating rtc is operating in backup power mode 15 en charge pump enable; activates vchg 4.1v (typ.) charging source 16 osci oscillator input; high-impedance node; minimize wire length between quartz and package cbc34123 input/output descriptions figure 4: cbc34123 package (left: top view, looking through package; right: pad dimensions) enerchip properties energy capacity (typical): 5ah recharge time to 80%: 10 minutes charge/discharge cycles: >5000 to 10% depth-of-discharge operating temperature: -20c to +70c storage temperature: -40c to +125c minimum vdd to charge enerchip: 2.5v package dimensions (mm) cbc34123 enerchip? rtc preliminary
?2012 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-31 v.08 page 4 of 9 absolute maximum ratings parameter condition min typical max units self-discharge (5 yr. average) non-recoverable - 2.5 - % per year recoverable - 1.5 (1) - % per year operating temperature - -20 25 +70 c storage temperature - -40 - +125 (2) c recharge cycles (to 80% of rated capacity) 25c 10% depth-of-discharge 5000 - - cycles 50% depth-of discharge 1000 - - cycles 40c 10% depth-of-discharge 2500 - - cycles 50% depth-of-discharge 500 - - cycles recharge time (to 80% of rated capacity; 4.1v charge; 25c) charge cycle 2 - 11 22 minutes charge cycle 1000 - 45 70 capacity (see figure 5) 25c 5 - - ah (1) first month recoverable self-discharge is 5% average. (2) storage temperature is for uncharged enerchip cc device. note: all specifcations contained within this document are subject to change without notice. parameter / pin condition min typical max units v dd with respect to gnd 25c gnd - 0.3 - 6.0 v enable input voltage 25c gnd - 0.3 - v dd +0.3 v v ec (1) 25c 3.0 - 4.15 v v chg (1) 25c 3.0 - 4.15 v reset output voltage 25c gnd - 0.3 - 2.7 v int/, ce, test, osci, osco, sdo, sdi, scl, clkoe, clkout see nxp pcf2123 data sheet integrated enerchip thin film battery operating characteristics (1) no external connections to these pins are allowed, except parallel enerchips. figure 5 tpical discharge characteristics of the cc5 enerchip ithin the cc1 cbc34123 enerchip? rtc preliminary
?2012 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-31 v.08 page 5 of 9 functional description of integrated pcf2123 real-time clock the pcf2123 contains 16 8-bit registers with an auto-incrementing address counter, an on-chip 32.768 khz oscillator with two integrated load capacitors, a frequency divider which provides the source clock for the real time clock (rtc), a programmable clock output, and a 6.25 mbit/s spi-bus. an offset register allows fne tuning of the clock. all 16 registers are designed as addressable 8-bit parallel registers although not all bits are implemented. ? the frst two registers (memory address 00h and 01h) are used as control registers. ? the memory addresses 02h through 08h are used as counters for the clock function (seconds up to years). the registers seconds, minutes, hours, days, weekdays, months, and years are all coded in binary coded decimal (bcd) format. when one of the rtc registers is written or read the contents of all counters are frozen. therefore, faulty writing or reading of the clock and calendar during a carry condition is prevented. ? addresses 09h through 0ch defne the alarm condition. ? address 0dh defnes the offset calibration. ? address 0eh defnes the clock out and timer mode. ? address registers 0eh and 0fh are used for the countdown timer function. the countdown timer has four selectable source clocks allowing for countdown periods in the range from 244 ms up to four hours. there are also two pre-defned timers which can be used to generate an interrupt once per second or once per minute. these are defned in register control_2 (01h). low power operation minimum power operation will be achieved by reducing the number and frequency of switching signals inside the ic, i.e., low frequency timer clocks and a low frequency clkout will result in lower operating power. a second prime consideration is the series resistance r s of the quartz used. power consumption with respect to quartz series resistance the series resistance acts as a loss element. low r s will reduce current consumption further. important reference documents for complete specifcations of the integrated pcf2123 real-time clock, see here: http://www.nxp.com/documents/data_sheet/pcf2123.pdf . for complete specifcations of the cymbet 5 ah enerchip and integrated power management circuit, see here: http://www.cymbet.com/pdfs/ds-72-21.pdf . the enerchip and power management functions within the cbc34123 are confgured as in mode 1 (vmode = gnd) described in the cbc3105 data sheet. for guidelines regarding crystal selection and other important information pertaining to the pcf2123, see the um10301 - user manual for nxp real time clocks, located here: http://www.nxp.com/documents/user_manual/um10301.pdf cbc34123 enerchip? rtc preliminary
?2012 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-31 v.08 page 6 of 9 pcf2123 register overview 16 registers are available. the time registers are encoded in the binary coded decimal (bcd) format to simplify application use. other registers are either bit-wise or standard binary. bit positions labeled as - are not implemented and will return a 0 when read. the bit position labeled as -- is not implemented and will return a 0 or 1 when read. bit positions labeled with n should always be written with logic 0 (1) . address register name bit 7 6 5 4 3 2 1 0 control and status registers 00h control_1 ext_test n stop sr n 12_24 cie n 01h control_2 mi si msf ti_tp af tf aie tie time and date registers 02h seconds os seconds (0 to 59) 03h minutes -- minutes (0 to 59) 04h hours - - ampm hours (1 to 12) in 12 h mode hours (0 to 23) in 24 h mode 05h days - - days (1 to 31) 06h weekdays - - - - - weekdays (0 to 6) 07h months - - - months (1 to 12) 08h years years (0 to 99) alarm registers 09h minute_alarm ae_m minute_alarm (0 to 59) 0ah hour_alarm ae_h - ampm hour_alarm (1 to 12) in 12 h mode hour_alarm (0 to 23) in 24 h mode 0bh day_alarm ae_d - day_alarm (1 to 31) 0ch weekday_alarm ae_w - - - - weekday_alarm (0 to 6) offset register 0dh offset_register mode offset[6:0] timer registers 0eh timer_clkout - cof[2:0] te - ctd[1:0] 0fh countdown_timer countdown_timer[7:0] [1] except in the case of software reset, see section 8.3.1.1. cbc34123 enerchip? rtc preliminary
?2012 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-31 v.08 page 7 of 9 power supply current characteristics of integrated cbc910 power management circuit only t a = -20 oc to +70oc characteristic symbol condition min max units quiescent current (cbc910 power management circuit only; v dd > v reset ; rtc current not included) i q enable=gnd v dd =3.3v - 3.5 a v dd =5.5v - 6.0 a enable=v dd v dd =3.3v - 35 a v dd =5.5v - 38 a enerchip cutoff current (i qbaton adds to rtc current when in backup mode) i qbatoff v bat < v batco , v out =0 - 0.5 na i qbaton v bat > v batco , enable=v dd , i out =0 - 42 na interface logic signal characteristics v dd = 2.5v to 5.5v, t a = -20 oc to +70oc characteristic symbol condition min max units high level input voltage v ih - v dd - 0.5 - volts low level input voltage v il - - 0.5 volts high level output voltage v oh v dd >v th (see figures 4 and 5) i l =10a v dd - 0.04v (1) - volts low level output voltage v ol i l = -100a - 0.3 volts logic input leakage current i in 0 ?2012 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-31 v.08 page 8 of 9 charge pump characteristics (pertains to integrated cbc910 power management circuit) (note: this table provides important information when connecting additional enerchips to vchg.) v dd = 2.5v to 5.5v, t a = -20 oc to +70oc characteristic symbol condition min max units enable=v dd to charge pump active t cpon enable to 3rd charge pump pulse, v dd =3.3v 60 80 s enable falling to charge pump inactive t cpoff - 0 1 s charge pump frequency f cp - 120 khz (1) charge pump resistance r cp delta v bat , for i bat charging current of 1a to 100a c fly =0.1f, c bat =1.0f 150 300 ? v chg output voltage v cp c fly =0.1f, c bat =1.0f, i out =1a, temp=+25oc 4.075 4.125 v v chg temp. coeffcient t ccp i out =1a, temp=+25oc -2.0 -2.4 mv/oc charge pump current drive i cp i bat =1ma c fly =0.1f, c bat =1.0f 1.0 - ma charge pump on voltage v enable enable=v dd 2.5 - v (1) f cp = 1/t cpper additional characteristics t a = -20 oc to +70oc characteristic symbol condition limits units min max v bat cutoff threshold v batco i out =1a 2.75 3.25 v cutoff temp. coeffcient t cco - +1 +2 mv/oc v bat cutoff delay time t cooff v bat from 40mv above to 20mv below v batco i out =1a 40 - ms note: all specifcations contained within this document are subject to change without notice cbc34123 enerchip? rtc preliminary
?2012 cymbet corporation ? tel: +1-763-633-1780 ? www.cymbet.com ds-72-31 v.08 page 9 of 9 cymbet, the cymbet logo, and enerchip are cymbet corporation trademarks disclaimer of warranties; as is the information provided in this data sheet is provided as is and cymbet corporation disclaims all representations or warranties of any kind, express or implied, relating to this data sheet and the cymbet enerchip product described herein, including without limitation, the implied warranties of merchantability, ftness for a particular purpose, non-infringement, title, or any warranties arising out of course of dealing, course of performance, or usage of trade. cymbet enerchip products are not authorized for use in life critical applications. users shall confrm suitability of the cymbet enerchip product in any products or applications in which the cymbet enerchip product is adopted for use and are solely responsible for all legal, regulatory, and safety-related requirements concerning their products and applications and any use of the cymbet enerchip product described herein in any such product or applications. ordering information enerchip cc part number description notes cbc34123-m5c enerchip rtc in 5mm x 5mm x 1.4mm 16-qfn land grid array shipped in tube CBC34123-M5C-TR1 cbc34123-m5c-tr5 enerchip rtc in 5mm x 5mm x 1.4mm 16-qfn land grid array tape-and-reel - 1000 pcs (tr1) or 5000 pcs (tr5) per reel cbc-eval-12 enerchip rtc evaluation kit usb based eval kit with cbc34123 tab board u.s. patent no. 8,144,508. additional u.s. and foreign patents pending cbc34123 enerchip? rtc preliminary
|
