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d s 3 2 3 1 m 5 p p m a i 2 c l h h ________________________________________________________________ _ maxim integrated products _ _ 1 19-5312; rev 0; 6/10 + ? ? ( p b ) / r o h s ? ? * ? ? ? ? ? y t
^ ? d s 3 2 3 1 m i 2 c ? ? ? ( r t c ) ?? ? ? ? ? ? ( m e m s ) ? ? d s 3 2 3 1m d s 3 2 3 1 r t c ? ? r t c ? ? 3 1 ? ? ? 2 4 ? a m / p m ? ? 1 2 ? ? ? 1 h z ? ? i 2 c ? ? ? v c c ? ? ? ? ? ? r s t ? ? ? ? ? ? ? ? ? ? + ? s - 4 0 c + 8 5 c ? s ? = 9 h ? 5 p p m ( 0 . 4 3 2
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? m a x i m ey g r ? ? 1 0 8 0 0 8 5 2 1 2 4 9 ( ? s u ) 1 0 8 0 0 1 5 2 1 2 4 9 ( 2 ? s u ) ` m a x i m ? ? _ c h i n a . m a x i m - i c. c o m b ds3231m scl sda 32khz v bat int/sqw rst +3.3v +3.3v cpu i/o port interrupts ? i ? ? ? ? ? ? ? ? ? ? china.maxim-ic.com/errata part temp_ range pin-package ds3231mz+* -40n c to +85nc 8 so ds3231m+ -40n c to +85nc 16 so
d s 3 2 3 1 m 5 p p m a i 2 c l h h 2 stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. voltage range on any pin relative to gnd ........ -0.3v to +6.0v operating temperature range .......................... -40n c to +85nc storage temperature range ............................ -55n c to +125nc lead temperature (soldering, 10s) ................................ +260nc soldering temperature (reflow) ...................................... +260nc recommended_ operating_ conditions (t a = -40 n c to +85n c, unless otherwise noted.) (note 1) electrical_ characteristicsfrequency_ and_ timekeeping (v cc or v bat = +3.3v, t a = -40 n c to +85n c, unless otherwise noted. typical values are at v cc = +3.3v, v bat = +3.0v, and t a = +25n c, unless otherwise noted.) dc_ electrical_ characteristicsgeneral (v cc = +2.3v to +5.5v, t a = -40 n c to +85n c, unless otherwise noted. typical values are at v cc = +3.3v, v bat = +3.0v, and t a = +25n c, unless otherwise noted.) absolute_ maximum_ ratings parameter symbol conditions min typ max units supply voltage v cc 2.3 3.3 5.5 v v bat 2.3 3.0 5.5 logic 1 v ih 0.7 x v cc v cc + 0.3 v logic 0 v il -0.3 0.3 x v cc v parameter symbol conditions min typ max units 1hz frequency tolerance df/f out measured over r 10s interval q5 ppm 1hz frequency stability vs. v cc voltage df/v q1 ppm/v timekeeping accuracy tk a q0.432 seconds/ day 32khz frequency tolerance df/f out q2.5 % parameter symbol conditions min typ max units active supply current (i 2 c active: includes temperature conversion current) i cca v cc = +3.63v 200 a v cc = v ccmax 300 standby supply current (i 2 c inactive: includes temperature conversion current) i ccs v cc = +3.63v 130 a v cc = v ccmax 200 temperature conversion current (i 2 c inactive) i ccsconv v cc = +3.63v 575 a v cc = v ccmax 650
d s 3 2 3 1 m 5 p p m a i 2 c l h h 3 ac_ electrical_ characteristicspower_ switch (t a = -40 n c to +85n c, unless otherwise noted.) (figure 2) dc_ electrical_ characteristicsgeneral_ (continued) (v cc = +2.3v to +5.5v, t a = -40 n c to +85n c, unless otherwise noted. typical values are at v cc = +3.3v, v bat = +3.0v, and t a = +25n c, unless otherwise noted.) dc_ electrical_ characteristicsv bat _ current_ consumption (v cc = 0v, v bat = +2.3v to +5.5v, t a = -40 n c to +85n c, unless otherwise noted. typical values are at v cc = 0v, v bat = +3.0v, and t a = +25 n c, unless otherwise noted.) parameter symbol conditions min typ max units power-fail voltage v pf 2.45 2.575 2.70 v logic 0 output (32khz, int /sqw, sda) v ol i ol = 3ma 0.4 v logic 0 output (rst) v ol i ol = 1ma 0.4 v output leakage (32khz, int /sqw, sda) i lo -0.1 +0.1 a input leakage (scl) i li -0.1 +0.1 a rst i/o leakage i ol -200 +10 a v bat leakage i batlkg 25 100 na temperature accuracy temp acc v cc or v bat = +3.3v q3 nc temperature conversion time t conv 10 ms pushbutton debounce pb db 250 ms reset active time t rst 250 ms oscillator stop flag (osf) delay t osf (note 2) 125 200 ms parameter symbol conditions min typ max units active battery current (i 2 c active) (note 3) i bata v bat = +3.63v 70 a v bat = v batmax 150 timekeeping battery current (i 2 c inactive) (note 3) i batt v bat = +3.63v, en32khz = 0 2 3.0 a v bat = v batmax , en32khz = 0 2 3.5 temperature conversion current (i 2 c inactive) i battc v bat = +3.63v 575 a v bat = v batmax 650 data retention current (oscillator stopped and i 2 c inactive) i batdr t a = +25 nc 100 na parameter symbol conditions min typ max units v cc fall time, v pfmax to v pfmin t vccf 300 fs v cc rise time, v pfmin to v pfmax t vccr 0 fs recovery at power-up t rec (note 4) 250 300 ms
d s 3 2 3 1 m 5 p p m a i 2 c l h h 4 ac_ electrical_ characteristicsi 2 c_ interface (v cc or v bat = +2.3v to +5.5v, t a = -40 n c to +85n c, unless otherwise noted. typical values are at v cc = +3.3v, v bat = +3.0v, and t a = +25 n c, unless otherwise noted.) (note 5, figure 1) note_ 1:_ all voltages are referenced to ground. note_ 2:_ the parameter t osf is the period of time the oscillator must be stopped for the osf flag to be set. note_ 3: includes the temperature conversion current (averaged). note_ 4: this delay applies only if the oscillator is enabled. if the eosc bit is 1, t rec is bypassed and rst immediately goes high. the state of rst does not affect the i 2 c interface or rtc functions. note_ 5: __ interface timing shown is for fast-mode (400khz) operation. this device is also backward-compatible with standard mode i 2 c timing. note_ 6:_ c b : total capacitance of one bus line in picofarads. parameter symbol conditions min typ max units scl clock frequency f scl 0 400 khz bus free time between stop and start conditions t buf 1.3 fs hold time (repeated) start condition t hd:sta 0.6 fs low period of scl t low 1.3 fs high period of scl t high 0.6 fs data hold time t hd:dat 0 0.9 fs data set-up time t su:dat 100 ns start set-up time t su:sta 0.6 fs sda and scl rise time t r (note 6) 20 + 0.1c b 300 ns sda and scl fall time t f (note 6) 20 + 0.1c b 300 ns stop set-up time t su:sto 0.6 fs sda, scl input capacitance c bin 10 pf
d s 3 2 3 1 m 5 p p m a i 2 c l h h 5 h ? m ? 3 . ? ? ? 1 . i 2 c ? ? 2 . ? ? scl note: timing is referenced to v ilmax and v ihmin . sda stop start repeated start t buf t hd:sta t hd:dat t su:dat t su:sto t hd:sta t sp t su:sta t high t r t f t low t rst pb db rst t vccf t vccr t rec v pfmax v cc rst v pfmin
d s 3 2 3 1 m 5 p p m a i 2 c l h h 6 ? ? y t + ? (t a = +25c, unless otherwise noted.) frequency error vs. temperature ds3231m toc06 temperature (c) frequency error (ppm) 50 0 -8 -6 -4 -2 0 2 4 6 8 10 -10 -50 100 limits v cc = 3.3v rst output voltage vs. power supply voltage ds3231m toc05 supply voltage (v) output voltage (v) 4 2 1 2 3 4 5 6 0 0 6 v bat = 3.0v, t a = +25c tracks with v cc rst output voltage vs. output current ds3231m toc04 output current (ma) output voltage (v) 4 3 2 1 0.1 0.2 0.3 0.4 0.5 0 0 5 v cc = 2.45v, v bat = 3.0v, t a = +25c int/sqw output voltage vs. output current ds3231m toc03 output current (ma) output voltage (v) 8 6 4 2 0.1 0.2 0.3 0.4 0.5 0 0 10 v cc = 2.3v, v bat = 0v, t a = +25c battery-supply current vs. battery-supply voltage ds3231m toc02 supply voltage (v) supply current (a) 5 4 3 1.5 2.0 2.5 3.0 3.5 4.0 1.0 2 6 v cc = 0v, en32khz = 1, bbsqw = 0 +85c +25c -40c power-supply current vs. power-supply voltage ds3231m toc01 supply voltage (v) supply current (a) 5 4 3 60 70 80 90 100 110 120 130 140 150 50 2 6 v bat = 2.3v, en32khz = 1, i out = 0ma increase below v pf due to internal pullup resistor on rst +85c +25c -40c
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16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 32khz scl sda v bat gnd n.c. n.c. n.c. n.c. top view so v cc int/sqw n.c. rst n.c. n.c. n.c. ds3231m ds3231m + v bat gnd rst 1 2 8 7 scl sda v cc int/sqw 32khz so top view 3 4 6 5 + ? ? ? ? ? 8_ so 16_ so 1 1 32khz 3 2 . 7 6 8 k h z ( 5 0 % ? ) ? ? ? ? ? ( 0 f h ) e n 3 2 k h z ? ? ? ? ? ? 2 2 v cc ? ? ? ? ? 0 . 1 f 1 . 0 f ? ? 3 3 int/ sqw ? 1 h z ? ? 5 . 5 v 5 . 5 v ? ? ? ( 0 e h ) i n t c n i n t c n ? 0 ? 1 h z i n t c n ? 1 ? ? ? ? ? i n t / s q w ( ? ) ? i n t c n ? 1 ? ? ? ? 4 4 rst ? ? ? / ? ? v c c v p f ? ? ? v c c v p f r s t v c c v p f t r s t ? r s t ? ? ? ? ? ? ? ? ? ? 5 0 k ( r p u ) v c c ? t r e c r s t ? 5C12 n.c. 5 13 gnd 6 14 v bat ? v b a t ? ? ? ? 0 . 1 f 1 . 0 f ? ? v b a t ? ? ? ? v b a t u l ? ? ? ? ? china.maxim-ic.com/qa/info/ul
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d s 3 2 3 1 m ? ? ? ( r t c ) ? ? ? ( m e m s ) ? ? - 4 0 c + 8 5 c r t c 0 . 4 3 2 / ? r t c ? ? / ? i n t / s q w 1 h z ? / ? ? 3 1 ? ? 2 4 ? a m / p m ? ? 1 2 ? ? ? i 2 c ? ? v c c ? ? ? ? ? r s t ? ? ? ? y t e ? ? ? ? ? ? ? z m ? ? a
( ? ) ds3231m n n time-base resonator temp sensor interrupt or 1hz select divider int/sqw 1hz digital adjustment factory trim n 32khz sda gnd scl v bat v cc rst r pu clock/calendar with alarm control and status registers i 2 c interface power control ? ? ? ? ? 8_ so 16_ so 7 15 sda / ? i 2 c / ? ? ? 5 . 5 v v c c ? 8 16 scl ? ? i 2 c ? ? ? 5 . 5 v v c c ?
d s 3 2 3 1 m 5 p p m a i 2 c l h h 9 h ? ? ? ? ? 1h z ? ? v c c ? ? ? ? ? v b a t ? ? ? 1 0 ? ? ? 1 h z ? ? ? ? ? ? ? ? ? ( ) a d s 3 2 3 1 m ? ? ( v c c v b a t ) ? ? ? ? ? ? ? ? ? ? ? ? 4 ? ? v c c ? v b a t v cc < v p f ? rs t ( ? ) ? ? ? ? ? 5 ? ? v b a t ? v c c r s t ? ? ? 1 0 ? ? ? ? 6 ? ? ? ? ? ? ? v c c v b a t ? ? ? v cc ? ? ? v cc v p f ? v c c v c c v p f v b a t ? v c c v c c v p f v b a t ? v b a t ( 1 ) v cc < v p f ? rs t ( ? ) ? v cc ? ? ? ? ? ? ? ? v b a t ? ? ? ? 1 0 ? ? ? ? v b a t ? v c c v p f ? ? ? i 2 c ? ? ? ? 1 v c c i 2 c ? ? 2 ? ? 4 . ? ( v c c ) ? 5 . ? ( v b a t ) ? 6 . ? ? v 1 . e ? v bat v cc +3.3v v bat v cc v bat v cc +3.3v configuration condition i/o_active i/o_inactive rst v cc only (figure 4) v cc > v pf i cca i ccs inactive (high) v cc < v pf active (low) v bat only (figure 5) eosc = 0 i bata i batt disabled (low) eosc = 1 i batdr dual supply (figure 6) v cc > v pf i cca i ccs inactive (high) v cc < v pf v cc > v bat i cca v cc > v bat i ccs active (low) v cc < v bat i bata v cc < v bat i batt
d s 3 2 3 1 m 5 p p m a i 2 c l h h 10 ? ? ? ? ? ? ? ( v c c v b a t ) ? ? ? ? ? ? ? v c c ? ? ? i 2 c ? ? ( v b a t ) ? 0 1 / 0 1 / 0 0 0 1 0 0 : 0 0 : 0 0 ( m m / d d / y y d o w h h : m m : s s ) v b a t y t ? ? ? ? v b a t v b a t ? ? ? ? i b a t a ? ? ? ? i b a t t ( ? ? i b a t t c ) ? i b a t t c ? ? ? ? ? ? ? i b a t d r ? ? ( e os c = 1 ) ? ? ? ? ( ? ? ) ? ? ? ? f ? ? r s t / ? r s t ? ? ? r s t ? ? ? ( p b d b ) r s t ? ? ? ? r s t ? ? t r s t ? r s t ? ? ? v c c v p f ? ? ? r s t v c c v p f ? ? r s t ? ? 2 5 0 m s ( t r e c ) ? ? v c c ? ? t r e c rs t ? ? ? ? ? ? rs t ? rs t v c c ? l h h ( r t c ) 1 h z ? r t c ? ? 3 1 ? ? 2 4 ? a m / p m ? ? 1 2 ? ? ? ? i n t / s q w 1 h z ? i n t c n i 2 c g ? ? v c c v b a t ? i 2 c ? v c c ? i 2 c ? ? ? ? ? ? ? s d a ? ? ? s c l i 2 c ? ? ? ? ? ? s c l ? ? ? s d a ? s t a r t 1 ? ? v 2 ? ? ? ? ? ? ( 1 2 h ) ? ? 0 0 h i 2 c s t a r t ? ? ? 0 0 h ? ? ? ? ? ? ? ? ? ? ? ?
d s 3 2 3 1 m 5 p p m a i 2 c l h h 11 h ? ? ? ? ? ? 2 r t c ? ? ? ? ? ? ? ? C ? ( b c d ) ? 1 2 ? 2 4 ? ? ? ? 6 ? 1 2 ? 2 4 ? ? ? ? ? ? ? 1 2 ? ? ? 1 2 ? ? ? 5 ? a m / p m ? ? ? ? p m 2 4 ? ? ? 5 ? 2 0 ? ( 2 0 2 3 ? ) 9 9 0 0 ? ? ( 7 ) v 2 . 9 h 7 i ? ? ? ? ? address bit_ 7_ msb bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0_ lsb function range 00h 0 10 seconds seconds seconds 00C59 01h 0 10 minutes minutes minutes 00C59 02h 0 12/24 am/pm 10 hours hour hours 1C12 + am/pm 00C23 20 hours 03h 0 0 0 0 0 day day 1C7 04h 0 0 10 date date date 01C31 05h century 0 0 10 month month month/century 01C12 + century 06h 10 year year year 00C99 07h a1m1 10 seconds seconds alarm 1 seconds 00C59 08h a1m2 10 minutes minutes alarm 1 minutes 00C59 09h a1m3 12/24 am/pm 10 hours hour alarm 1 hours 1C12 + am/pm 00C23 20 hours 0ah a1m4 dy/dt 10 date day alarm 1 day 1C7 date alarm 1 date 1C31 0bh a2m2 10 minutes minutes alarm 2 minutes 00C59 0ch a2m3 12/24 am/pm 10 hours hour alarm 2 hours 1C12 + am/pm 00C23 20 hours 0dh a2m4 dy/dt 10 date day alarm 2 day 1C7 date alarm 2 date 1C31 0eh eosc bbsqw conv na na intcn a2ie a1ie control 0fh osf 0 0 0 en32khz bsy a2f a1f status 10h sign data data data data data data data aging offset 11h sign data data data data data data data temperature msb 12h data data 0 0 0 0 0 0 temperature lsb
d s 3 2 3 1 m 5 p p m a i 2 c l h h 12 ? ? ? ? ? ( 1 ? 2 ? ) ? ? ? ? ? ? ? ? ? ? i 2 c s t a r t ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1 ? ? ? 9 / 1 ? 0 7 h 0 a h 2 ? 0 b h 0 d h 2 ( ? ? i n t c n ) ? i n t / s q w ? / 7 ( 2 ) ? ? 0 ? ? ? ? / ? ? ? ? ? ? ? ? 3 d y / d t ( / 6 ) 0 5 ? ? d y / d t ? 0 ? d y / d t ? 1 ? r t c ? ? ? ? ? ? a 1 f a 2 f ? 1 ? ? a 1 i e a 2 i e ? ? 1 i n t c n ? 1 ? i n t / s q w ? ? ? ? v 3 . 9 7 dy/dt alarm_ 1_ register_ mask_ bits_ (bit_ 7) alarm_ rate a1m4 a1m3 a1m2 a1m1 x 1 1 1 1 alarm once a second x 1 1 1 0 alarm when seconds match x 1 1 0 0 alarm when minutes and seconds match x 1 0 0 0 alarm when hours, minutes, and seconds match 0 0 0 0 0 alarm when date, hours, minutes, and seconds match 1 0 0 0 0 alarm when day, hours, minutes, and seconds match dy/dt alarm_ 2_ register_ mask_ bits_ (bit_ 7) alarm_ rate a2m4 a2m3 a2m2 x 1 1 1 alarm once per minute (00 seconds of every minute) x 1 1 0 alarm when minutes match x 1 0 0 alarm when hours and minutes match 0 0 0 0 alarm when date, hours, and minutes match 1 0 0 0 alarm when day, hours, and minutes match
d s 3 2 3 1 m 5 p p m a i 2 c l h h 13 e ? 7 i ( 0 e h ) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 eosc bbsqw conv na na intcn a2ie a1ie 0 0 0 1 1 1 0 0 bit 7 e o s c ? ? 0 ? ? 1 ? ? v b a t ? ? ? ? ( 0 ) v c c ? e o s c ? ? ? ? ? ? ? ? bit 6 b b s q w ? ? 1 i n t c n = 0 v c c < v p f ? ? 1 h z b b s q w ? 0 ? v c c v p f i n t / s q w ? ? ? ? ( 0 ) bit 5 co n v ? ? 1 ? ? ? ? ? ? ? ? ? c o n v ? ? ? ? ? ? 1 ? c o n v b s y ? 0 ? ? ? ? ? ? c o n v ? ? ? 7 bits 4:3 n a ? ? 0 1 bit 2 i n t c n i n t / s q w i n t c n ? 0 ? i n t / s q w 1 h z i n t c n ? 1 ? ? ? ? i n t / s q w ( ? ? ) ? ? i n t c n ? ? ? i n t c n ? 1 bit 1 a 2 i e 2 ? ? 1 ? ? ? 2 ? ( a 2 f ) i n t / s q w ( i n t c n = 1 ? ) a 2 i e ? 0 i n t c n ? 0 ? a 2 f ? a 2 i e ? ( 0 ) bit 0 a 1 i e 1 ? ? 1 ? ? ? 1 ? ( a 1 f ) i n t / s q w ( i n t c n = 1 ? ) a 1 i e ? 0 i n t c n ? 0 ? a 1 f ? a 1 i e ? ( 0 )
d s 3 2 3 1 m 5 p p m a i 2 c l h h 14 ? 7 . c o n v b s y ? ? v cc powered v ba t powered internal 1hz clock bsy conv internal 1hz clock bsy conv the user sets the conv bit the user sets the conv bit 10 seconds the device clears the conv bit after the temperature conversion has completed the device clears the conv bit after the temperature conversion has completed bsy is high during the temperature conversion
d s 3 2 3 1 m 5 p p m a i 2 c l h h 15 ? 7 i ( 0 f h ) o ? ? 7 i ( 1 0 h ) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 osf 0 0 0 en32khz bsy a2f a1f 1 0 0 0 1 x x x bit 7 o s f ? ? ? ? 1 ? ? ? ? ? ? ? ? ? ? 1 ? 1 ? 0 o s f 1 ) 2 ) v c c v b a t ? ? 3 ) ? ? e o s c 4 ) ? ( ? ) bits 6:4 ? ( 0 ) ? ? ? 0 bit 3 e n 3 2 k h z ? 3 2 . 7 6 8 k h z 3 2 k h z ? ? ? 0 ? 3 2 k h z ? ? ? ? ? 1 ? 3 2 k h z ? 3 2 . 7 6 8 k h z bit 2 b s y ? ? ? ? ? ? ? 1 ? ? ? ? bit 1 a 2 f 2 ? 2 ? ? 1 ? ? ? 2 ? a 2 i e ? 1 i n t c n ? 1 i n t / s q w 0 ? a 2 f 0 ? 1 ? ? bit 0 a 1 f 1 ? 1 ? ? 1 ? ? ? 1 ? a 1 i e ? 1 i n t c n ? 1 i n t / s q w 0 ? a 1 f 0 ? 1 ? ? bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 sign data data data data data data data 0 0 0 0 0 0 0 0 ? ? ? ? ? ? ? ? e l e c t r i c a l c h a r a c t e r i s t i c s ? ? ? 2 ? 7 ? ( s i g n ) ? l s b ? ? 0 . 1 2 p p m ? ? l s b ? ? ( p p m ) ? ? ? ? ?
d s 3 2 3 1 m 5 p p m a i 2 c l h h 16 i 2 c 1 g y t e ? i 2 c v 1 ? ? ? d 0 h ? ? ? r / w ( ? 8 ) i 2 c ? ? ? i 2 c ? l i 2 c ? ?q s c l ? s t a r t s t o p vq 9 l b = ?
? s t o p s t a r t ? s d a s c l ? ? ? ? ? ? ? s t a r t h q s t a r t ? ? s c l ? s d a ? ? ? ? s t a r t ? ? ? 1 ? s t o p h q s t o p ? ? s c l ? s d a ? ? ? s t o p ? ? ? 1 ? s t a r t h q ? s t a r t ? ? ? ? s t a r t ? ? ? ? ? s t a r t ? ? s t a r t ? ? ? ? 1 ? ? 7 i ( 1 1 h 1 2 h ) ? 8 . i 2 c ? 1 1 1 0 r/w 0 0 0 msb lsb read/ write bit device identifier ? 7 i ( 3 ? = 1 1 h ) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 sign data data data data data data data 0 0 0 0 0 0 0 0 ? 7 i ( ? 3 ? = 1 2 h ) bit_ 7 bit_ 6 bit_ 5 bit_ 4 bit_ 3 bit_ 2 bit_ 1 bit_ 0 data data 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ? 1 0 ? 0 . 2 5 c ? ? 1 1 h 1 2 h ? 2 ? 8 ( ) ? 1 1 h 2 ( ) ? 1 2 h 0 0 0 1 1 0 0 1 0 1 b = + 2 5 . 2 5 c ? ? ? ? 0 c ? v c c v b a t ? i 2 c ? ? ? ? ? ? ? ( v c c ) ? 1 0 ( v b a t ) ? ? ? ? ?
d s 3 2 3 1 m 5 p p m a i 2 c l h h 17 s d a ? s c l ? s c l ? ? ? ? ( ? 1 ) s d a s c l ? s d a s c l ? ? ? ? ( ? 1 ) ? ? s c l ? ? ? s d a ? s c l ? ? s c l ? ? ? ? s ( a c k ? n a c k ) ? ( a c k ) ? ( n a c k ) ? 9 ( ? ) 9 0 a c k 9 1 n a c k ? a c k n a c k ? ? a c k ? n a c k ? ? ? 3? 8 ? ( ? ) 1 ? 8 ? ? 3 ? 8 ? 1 a c k n a c k ? 8 ? ( ? ) a c k ? ? ? n a c k ? ? ? s d a ? v1?3? i 2 c ? s t a r t ? ? ? ? 7 ? r / w ? ? d 0 h ? r / w = 0 ? ( ? d 0 h ) ? r / w = 1 ? ( ? d 1 h ) ? ? i 2 c ? ? s t a r t ? ? ? i % 1 ? i 2 c ? ? ? ? ? ? ? ? i 2 c y ? i 2 c ? ? 9 _ v ? ? ? 3 ? s t a r t ? ( r / w = 0 ) ? s t o p ? ? ? _v??3? ? ? s t a r t ? ( r / w = 0 ) ? s t o p v v | ? ? 3 ? ? ? ? ? ? ? ? ? ? s t a r t ? ( r / w = 1 ) ? ? n a c k ? ? ? ? s t o p ? ? ? ? ? ? ? ? t h 1 ? 9 ? ? ? ? ? ? ? ? ? s t a r t ? ( r / w = 0 ) ? ? ? ? s t a r t ? ( r / w = 1 ) a c k n a c k ? ? s t o p s t a r t ? ? ? ? 6
d s 3 2 3 1 m 5 p p m a i 2 c l h h 18 v v | ? 3 ? ? ? ? ? ? ? ? ? ? ? ? ? a c k ? ? ? n a c k ? ? ? ? s t o p ? ? ? ? d s 3 2 3 1 m ? ? 0 . 1 f / 1 . 0 f v c c / v b a t ? ? ? ? ? ? ? ? ? ? v b a t ? p
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^ { 3 2 k h z i n t / s q w ? ? ? ? ? ? ? 1 k 1 0 m ? r s t ? ? ? v c c 5 0 k ( r p u ) s d a ? s c l ? e s d a ? ? ? ? ? ? ? ? s c l ? ( ) c m o s ( ) y 1 m a x i m ? ? 9 . i 2 c sla ve address st ar t st ar t 1 1 0 1 0 0 0 sla ve ack sl ave ack sl ave ack r/w msb lsb msb lsb msb lsb b7 b6 b5 b4 b3 b2 b1 b0 read/ write register address b7 b6 b5 b4 b3 b2 b1 b0 da ta stop single byte write -write control register to 44h mul tibyte write -write da te register to "02" and month register to "11" single byte read -read control register mul tibyte read -read alarm 2 hours and da te v alues st ar t repea ted st ar t d1h master nack stop 1 1 0 1 0 0 0 0 0 0 0 0 1 1 1 0 0eh 1 1 0 1 0 0 0 1 1 1 0 1 0 0 0 0 0 0 0 0 1 1 1 0 d0h 0eh stop va lue st ar t 1 1 0 1 0 0 0 0 0 0 0 0 0 1 0 0 d0h 04h da ta master nack stop va lue da ta 02h 44h example i 2 c transactions typical i 2 c write transaction 0 1 0 0 0 1 0 0 0 0 0 0 0 0 1 0 d0h a) c) b) d) sla ve ack sla ve ack sl ave ack sla ve ack sla ve ack sla ve ack sl ave ack repea ted st ar t d1h master ack 1 1 0 1 0 0 0 1 va lue da ta sl ave ack sla ve ack sl ave ack st ar t 1 1 0 1 0 0 0 0 0 0 0 0 1 1 0 0 d0h 0ch sla ve ack sla ve ack stop 11h 0 0 0 1 0 0 0 1 sl ave ack
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