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w91f840n series 23 - flash memory tone /pulse dialer with handfr ee, lock and hold fu nctions publication release date: july 1999 - 1 - revision a2 general description the w91f840n is a series of tone/pulse switchable telephone dialers with 23 - flash memory, keytone, two store key function, hold, lock, mute, volume control and handfree dialing control features. these chips are fabricated using winbond' s high - performance cmos technology and thus offer good performance in low - voltage, low - power operations. features tone/pulse switchable dialer two by 32 digits redial and save memory three by 32 digits one - touch direct repertory flash - memory twe nty by 32 digits one - touch direct or two - touch indirect repertory flash - memory the read - write times: 10 4 pulse - to - tone (*/t) keypad for long distance call operation chain dialing uses 6 6 or 7 7 keyboard easy operation with redial, flash, pa use, and */t keypads pause, p ? t (pulse - to - tone) can be stored as a digit in memory dialing rate: 10 or 20 pps by mask option minimum tone output duration: 93 ms minimum intertone pause: 93 ms pause time: 3.6 sec. two store key function. (s1 an d s2) flash break time (100 ms, 300 ms, or 600 ms) selectable by keypad; pause time is 1.0 s make/break ratio (2:3 or 1:2) selectable by mode pin mute key for speech network mute no key will be accepted except the "hold" key when in the hold mode 4 - level volume control by v1 and v2 pin - default value is zero key tone output for valid keypad entry recognition on - chip power - on reset uses 3.579545 mhz crystal or ceramic resonator 22 - pin 400 mil, 24 - pin 600 mil or 28 - pin 600 mil dual - in - line plastic package the different dialers in the w91f840n series are shown in the following table: type no. pulse ( pp s) flash - memory lock key tone handfree dialing volume control package (pins) w91f840n 10 13 one touch, 10 two touch - ? - - 22 w91f840an 10 13 one touch, 10 two touch - ? ? - 24 w91f840ln 10 13 one touch, 10 two touch ? - - - 22 W91F840ALN 10 13 one touch, 10 two touch ? - ? - 24 w91f841an 10 23 one touch - ? ? ? 28 w91f841aln 10 23 one touch ? - ? ? 28 w91f842n 20 13 one touch, 10 two t ouch - ? - - 22 w91f842an 20 13 one touch, 10 two touch - ? ? - 24 w91f843an 20 23 one touch - ? ? ? 28
w91f840n series - 2 - pin configurations 1 18 r4 c1 c2 c3 c4 ss v 2 3 4 5 6 13 14 15 16 17 r1 r2 r3 mode dd v 7 8 9 10 11 12 dtmf hks xt t/p mute dp lock w91f840ln 19 20 c5 r6 h/p mute 21 22 k mute 1 18 r4 c1 c2 c3 c4 ss v 2 3 4 5 6 13 14 15 16 17 r1 r2 r3 mode dd v 7 8 9 10 11 12 dtmf hks xt t/p mute dp lock 19 20 c5 r6 h/p mute 21 22 k mute hfi hfo v1 v2 23 24 25 26 w91f841aln r7 c6 27 28 W91F840ALN 1 18 r4 c1 c2 c3 c4 ss v 2 3 4 5 6 13 14 15 16 17 r1 r2 r3 mode dd v 7 8 9 10 11 12 dtmf hks xt t/p mute dp lock 19 20 c5 h/p mute 21 22 k mute hfi hfo 23 24 1 18 r4 c1 c2 c3 c4 ss v 2 3 4 5 6 13 14 15 16 17 r1 r2 r3 mode dd v 7 8 9 10 11 12 dtmf hks xt t/p mute dp kt w91f840n/f842n 19 20 c5 h/p mute 21 22 k mute 1 18 r4 c1 c2 c3 c4 ss v 2 3 4 5 6 13 14 15 16 17 r1 r2 r3 mode dd v 7 8 9 10 11 12 dtmf hks xt t/p mute dp xt kt 19 20 c5 r6 h/p mute 21 22 k mute hfi hfo v1 v2 23 24 25 26 w91f841an/f843an r7 c6 27 28 w91f840an/f842an 1 18 r4 c1 c2 c3 c4 ss v 2 3 4 5 6 13 14 15 16 17 r1 r2 r3 mode dd v 7 8 9 10 11 12 dtmf hks xt t/p mute dp xt kt 19 20 c5 h/p mute 21 22 k mute hfi hfo 23 24 xt xt xt xt r6 r6 r6
w91f840n series publication release date: july 1999 - 3 - revision a2 pin description symbol 22 - pin 24 - pin 28 - pin i/o function column - row inputs 1 - 5 & 18 - 22 1 - 5 & 20 - 24 1 - 6 & 23 - 28 i the keyboard input is compatible with a standard 6 6 or 7 7 keyboard, an inexpensive single contact (form a) keyboard, and electronic input. in normal operation, any single button can be pushed to produce dual tone, pulses, or functions. activation of two or more buttons will result in no response except for a single tone. xt 9 9 10 i a built - in inverter together with an inexpensive 3.579545 mhz crystal supplies the oscillator. the oscillator stops when there is no keypad input. the cryst al frequency deviation is 0.02%. xt 10 10 11 o crystal oscillator output pin. t/p mute 11 11 12 o the t/p mute is a conventional cmos n - channel open drain output. the output transistor turns on with a lo w level during a dialing sequence (both pulse and tone mode). otherwise, it is off. k mute 17 19 22 o the k mute is a conventional cmos n - channel open drain output. toggle action speech mute control pin by mute key. mode 15 17 20 i connecting the mode pin to v ss places the dialer in tone mode. connecting the mode pin to v dd places the dialer in pulse mode with an m/b ratio of 40:60 . leaving the mode pin floating places the dialer in pulse mode with an m/b ratio of 33.3:66. 7. hks 12 14 17 i the hks (hook switch) input is used to sense whether the handset is on - hook or off - hook. in on - hook state, hks = 1: chip is in sleeping mode, no operation. in off - hook state, hks = 0: chip is enabled for normal operation. hks pin is pulled to v dd by internal resistor. kt (w91f840n/f8 40an/f842n/f 842an/f841an /f843an only) 6 6 7 o the key tone output is a conventional cmos inverter. the key tone is generate d when any valid key is pressed; the kt pin generates a 1.2 khz square wave at 35 ms. when no key is pressed, the kt pin remains in low state.
w91f840n series - 4 - pin description, continued symbol 22 - pin 24 - pin 28 - pin i/o function lock (w91f840ln/ f840aln/ f841aln only) 6 6 7 i the function of this terminal is to prevent "0" dialing and "9" dialing under pabx system long distance call control. when the first key input after reset is 0 or 9, all key inputs, including the 0 or 9 key, become invalid and the chi p generates no output. the telephone is reinitialized by a reset. the function of the lock pin is shown below: lock pin function v dd v ss floating "0", "9" dialing inhibited normal dialing mode "0" dialing inhibited h/p mute 7 7 8 i the h/p mute is a conventional inverter output. during pulse dialing, flash break or hold peri od, this output is active high; otherwise, it remains in low state. dp 13 15 18 o n - channel open drain dialing pulse output. flash key will cause dp to be active in either tone mode or pulse mode. the timing diagram for pulse mode is shown in figure 1(a, b). dtmf 14 16 19 o during pulse dialing, this pin remains in a low state regardless of the keypad input. in tone mode, it will output a dual or single tone. a detailed timing diagram for tone mode is shown in figure 2( a, b). r1 r2 r3 r4 c1 c2 c3 specified 697 770 852 941 1209 1336 1477 699 766 848 948 1216 1332 1472 actual +0.28 -0.52 -0.47 +0.74 +0.57 -0.30 -0.34 error % output frequency v dd , v ss 16, 8 18, 8 21, 9 i power input pins for the dialer chip. v dd is the power and v ss is the ground.
w91f840n series publication release date: july 1999 - 5 - revision a2 pin description, continued symbol 22 - pin 24 - pin 28 - pin i/o function v1, v2 - - 14, 15 o volume control output pins. these two pins can be toggled by the volume control keys (vup, vdown). these two pins output is a conventional cmos n - channel open drain output. hfi , hfo - 12, 13 13, 16 i, o handfree control pins. a low pulse on the hfi input pin toggles the handfree control state. the status of the handfree control state is listed in the following table: hook sw. - on hook off hook on hook off hook off hook current state next state hfo low high high - low high input hfi hfi hfi off hook on hook on hook hfo high low low low low high dialing yes no yes yes no yes the hfi pin is pulled to v dd by an internal resistor. a detailed timing diagram is shown in figure 3. blo ck diagram dtmf xt xt hks mode ram counter system clock generator location latch d/a row & column programmable counter data latch & decoder read/write hfi row (r1 ~ r7) column (c1 ~ c6) t/p mute hfo control logic pulse control logic keyboard interface converter lock dp kt h/p mute k mute v1 v2
w91f840n series - 6 - functional descripti on keyboard operation c1 c2 c3 c4 c5 v ss 1 2 3 s1 m0 em1 r1 4 5 6 f4 m1 em2 r2 7 8 9 page m2 em3 r3 */ t 0 # r/p m3 save r4 f1 f2 s2 h m4 vx/r5 m5 m6 m7 m8 m9 mute r6 c1 c2 c3 c4 c5 c6 v ss 1 2 3 s 1 m0 m10 em1 r1 4 5 6 f4 m1 m11 em2 r2 7 8 9 page m2 m12 em3 r3 */ t 0 # r/p m3 m13 save r4 f1 f2 s2 h m4 m14 vx/r5 m5 m6 m7 m8 m9 r mute r6 m15 m16 m17 m18 m19 vup vdown r7 s1,s2: store function key page: indirect repertory memory dialing func tion key h: hold function key r: one key redial function key r/p: redial and pause function key */t: * in tone mode and p ? t key in pulse mode save: save function key for one - touch 32 - digit memory mute: mute function key for speech mute m0 - m9: one touch memory. the dialing number can be stored in m0 - m9 locations by the s key. note that the two touch memory (page+ 0... page+9) share the same memory buffer with m10 - m19, respectively m10, ..., m19: one touch or two touch memory keys. if there are no m10 - m19 keys,push the key page + (mm = m0 - m9) can be used to simulate m10 - m19. em1, ..., em3: emergency one - touch memory key page: indiect repertory dialing function key f1, ..., f4: flash function keys: f1 = 600 ms, f2 = 300 ms, f4 = 100 ms; all flash pause time is 1.0 s note: d1, ..., dn, d1`, ..., dn`, * /t, #, mm: m0, ..., m9, mn: m0, ..., m19, ln: 0 - 9 page + ln = page + mm = m10 - m19
w91f840n series publication release date: july 1999 - 7 - revision a2 normal dialing off hook (or on hook & hfi ), d1 , d2 , ? , dn 1. d1, d2, ? , dn will be dialed out. 2. dialing length is unlimited, but redial is inhibited if length oversteps 32 digits in normal dialing. redialing dialing 1. off hook (or on hook & hfi , d1 , d2 , ? , dn , busy come on hook , off hook (or on hook & hfi ), r/p the r/p key can execute redial function only as first key - in after off - hook. otherwise, it will invoke the pause function. 2. off hook (or on hook & hfi ), d1 , d2 , ..., dn , r a. the one - key redial function timing diagram is shown in figure 5. b. if dialing of d1 to dn is finished, pressing r key will cause the pulse output pin to go low for 2.2 seconds break time and a 600ms pause will automatically be added. c. if the pulses of the dialed number d1 to dn have not finished, r will be ignored. 3. off hook (or on hook & hfi ), d1 , d2 , ..., dn , busy on hook come, off hook , okr (or r/p ) if r is the first key after off hook, it only can execute the redialing function but will not cause the pulse output pin to go low for the break time of 2.2 seconds. number store 1. off hook (or on hook & hfi ), d1 , d2 , ..., dn , s1 , s1 , mn (or page ln or emp or save ) note: mn: m0, ..., m19; mm: m0, ..., m9; emp: em1, ..., em3; mo: m10 - m19 or off hook (or on hook & hfi ), d1 , d2 , ..., dn , s2 , s2 , emp or mo or save or page , ln )
w91f840n series - 8 - a. the dialing out of d1 to dn must first be finished before the s1 or s2 key is pressed. b. d1, d2, ? , dn will be store d in memory location mn or saved and then dialed out. c. d1, d2, ? , dn will be stored in memory location mo or saved and then dialed out. 2. off hook (or on hook & hfi wr ), s1 , d1 , d2 , ..., dn , s1 , mn (or page ln or emp or save ) or off hook (or on hook & hfi ), s2 , d1 , d2 , ..., dn , s2 , mo or emp or save or page , ln ) d1, d2, ? , dn will be stored in memory location, mn (s1), (mo (s2), or saved), but will not be dialed out. 3. a. r/p and */t keys can be stored as a digit in memory, but the r/p key cannot be the first digit. in store mode, r/p is the pause function key. b. the store mode is released after the store function is executed or when the state of the hook switch changes or the flash function is executed. notes a. s1: store 1 key can access the memory 0 to 19. b. s2: store 2 key can access the memory 10 to 19. c. save, em1 ~ em3 can be accessed by s1 and s2 key. save off hook (or on hook & hfi ), d1 , d2 , ..., dn , save a. d1, d2, ..., dn will be dialed out. b. if the dialing of d1 to dn is finished, pressing save will duplicate d1 to dn to the save memory. off hook (or on hook & hfi ), come on off hook (or on hook & hfi ), save c. d1 to dn will be dialed out after the save key is pressed. repertor y dialing procedure one - touch direct repertory dialing: off hook (or on hook & hfi ), mn (or emn or save )
w91f840n series publication release date: july 1999 - 9 - revision a2 two - touch direct repertory dialing: off hook (or on hook & hfi ), page , ln (or mn ) access pause off hook (or on hook & hfi ), d1 , d2 , r/p , d3 , ..., dn 1. the pause function can be stored in memory. 2. the pause function is executed with normal di aling, redialing or memory dialing. 3. the pause function timing diagram is shown in figure 6. pulse - to - tone (*/t) off hook (or on hook & hfi ), d1 , d2 , ..., dn , */t , d1' , , d2' , ..., dn' 1. if th e mode switch is set in pulse mode, then it will perform d1, d2, --- , dn, pause, (3.6 sec), d1', d2', --- , dn' (pulse) (tone) 2. if the mode switch is set in tone mode, then the output signal will be: d1, d2, --- , dn, * , d1', d2', --- , dn' (ton e) (tone) 3. it can be reset to pulse mode only if on hook is active. this is because it remains in tone mode when the digits have been dialed out. 4. the function timing diagram is shown in figure 7. flash off hook (or on hook & hfi ), fn 1. fn = f1, f2, f4. if fn is pressed, the dialer will execute a flash break time of 600 ms (f1), 300 (f2), 100 ms (f4) and a pause time of 1.0 second before the next digit is dialed out. 2. the flash key has the f irst priority of the keyboard function only one flash key will be released to the user. 3. when the flash key is key in, the system will return to the initial state after the flash pause time is finished. 4. the flash function timing diagram is shown in figure 8.
w91f840n series - 10 - cascaded dialing off hook (or on hook & hfi ) 1. normal dialing + repertory dialing + normal dialing (1st sequence) (2nd sequence) 2. repertory dialing + normal dialing + repertory dialing (1st sequence) (2nd sequence) 3. redialing + normal dialing + repertory dialing (1st sequence) (2nd sequence) redialing is valid only for the first key - in. the second sequence should not be operated until the first sequence is dialed out completely. mute off hook , mute mute has an on/off toggle function. absolute maximum rat ing parameter symbol rating unit dc supply voltage v dd - v ss - 0.3 to +7.0 v v il v ss - 0.3 v input/output voltage v ih v dd +0.3 v v ol v ss - 0.3 v v oh v dd +0.3 v power dissi pation p d 120 mw operation temperature t opr - 20 to +70 c storage temperature t stg - 55 to +150 c note: exposure to conditions beyond those listed under absolute maximum ratings may adversely affect the life and reliability of the device.
w91f840n series publication release date: july 1999 - 11 - revision a2 dc charact eristics (v dd - v ss = 2.5v, fosc. = 3.58 mhz, t a = 25 c, all outputs unloaded) parameter sym. conditions min. typ. max. unit operating voltage v dd - 2.4 - 5.5 v operating current i op tone - 0.4 0.6 ma pulse - 0.2 0.4 ma standby current i sb hks = 0, no load & no key entry - - 15 m a memory retention current i mr hks = 1, v dd = 1.0v - - 1 m a tone output voltage v to row group, r l = 5 k w 130 150 170 mvrms pre - emphasis col/row, v dd = 2.0 - 5.5v 1 2 3 db dtmf distortion t hd r l = 5 k w , v dd = 2.0 - 5.5v - - 30 - 23 db dtmf output dc level v tdc r l = 5 k w , v dd = 2.0 - 5.5v 1.0 - 3.0 v dtmf output sink current i tl v to = 0.5v 0.2 - - ma dp output sink current i pl v po = 0.5v 0.5 - - ma t/p mute output sink current i ml v mo = 0.5v 0.5 - - ma kt drive/sink current i kth v kth = 2.0v 0.5 - - ma i ktl v ktl = 0.5v 0.5 - - ma hfo drive/sink current i hfh v hfh = 2.0v 0.5 - - ma i hfl v hfl = 0.5v 0.5 - - ma k mute sink cu rrent i kml v kml = 0.5v 0.5 - - ma h/p mute i hph v hph = 2.0v 0.5 - - ma drive/sink current i hpl v hpl = 0.5v 0.5 - - ma keypad input drive current i kd v i = 0v 4 - - m a hks pull high resister rhks 300 500 - k w keypa d input sink current i ks v i = 2.5v 200 400 - m a keypad resistance - - 5.0 k w
w91f840n series - 12 - ac characteristics parameter sym. conditions min. typ. max. unit key - in debounce t kid - - 20 - ms key release debounce t krd - - 20 - ms on - hook debounce t ohd lock mode - 2 0 - ms unlock mode - 150 - ms pre - digit pause 1 t pdp1 mode pin = v dd - 40 - ms 10 pps mode pin = floating - 33.3 - ms pre - digit pause 2 t pdp2 mode pin = v dd - 20 - ms 20 pps mode pin = floating - 16.7 - ms inter digit pause (auto dialing) t idp 10 pps (unless 91f840n/w91f840an/ 840ln/f840aln/f841an/ f841aln only ) - 800 - ms 20 pps (w91f842n/f842an/f843an only) - 500 - ms interdigit pause t idp 10 pps - 800 - ms (auto dialing) 20 pps - 500 - ms make/break ratio m:b mode pin = v dd - 40:60 - % mode pin = floating - 33.3:66.7 - % tone output duration t td - 93 - ms intertone pause t itp - 93 - ms flash break time t fb f1 - 600 - ms f2 - 300 - f4 - 100 - flash pause time t fp - - 1.0 - s pause time t p - - 3.6 - s key tone frequenc y f kt - - 1.2 - khz key tone duration t ktd - - 35 - ms one - key redialing pause time t rp - - 600 - ms one - key redialing break time t rb - - 2.2 - s first key - in delay t fkd lock only - 300 - ms notes: 1. crystal parameters suggested for proper operation are rs < 100 w , lm = 96 mh, cm = 0.02 pf, cn = 5 pf, cl = 18 pf, fosc. = 3.579545 mhz 0.02%. 2. crystal oscillator accuracy directly affects these times.
w91f840n series publication release date: july 1999 - 13 - revision a2 volume control flow chart vol-set2: v1 = 0, v2 = 0 in handset mode volume set in handfree mode volume set volume data can't be changed , and will out handfree data in hold mode in hold mode hold release by handfree ? no yes in handfree mode in handset mode vol-set1: v1 = 0, v2 = 0 off-hook ? yes no on line volume initial data: v1 = 0, v2 = 0
w91f840n series - 14 - volume control flow chart, continied volume initial data: v1 = 0, v2 = 0 chip enable ? no yes hand-free ? no yes in handset mode press vup or vdown keys volume setting ok ? no in hand-free mode press vup or vdown keys yes press hand-free key ? yes no volume setting ok ? no switch to handset ? yes no yes
w91f840n series publication release date: july 1999 - 15 - revision a2 timing waveforms 4 2 t kid b m t idp t idp t pdp t kid t idp t pdp 2 hks key in dp t/p mute m b low osc. osc. h/ p mute dtmf osc. kt figure 1(a) pulse mode tming diagram (normal dialing without lock function) 4 2 t kid b m t idp t idp t pdp t kid t idp t pdp 2 hks key in dp t/p mute m b low osc. osc. h/ p mute dtmf osc. t fkd 300 ms figure 1(b) pulse mode timing diagram (normal dialing with lock function)
w91f840n series - 16 - timing waveforms, continued r/p b m t idp t idp t pdp t idp t pdp low osc. h/p mute dtmf osc. on hook kt m b key in dp t/p mute hks figure 1(c) pulse mode timing diagram (auto dialing without lock) r/p b m t idp t idp t pdp t idp t pdp low osc. h/p mute dtmf osc. on hook m b key in dp t/p mute hks 300 ms t fkd figure 1(d) pulse mode timing diagram (auto dialing with lock function)
w91f840n series publication release date: july 1999 - 17 - revision a2 timing waveforms, continued t kid t td high osc. osc. dtmf osc. kt t itp t krd t itp t krd t kid t itp t krd low 3 2 6 5 h/p mute dtmf hks key in t/p mute figure 2(a) tone mode timing diagram (normal dialin g without lock) t kid t td high osc. osc. dtmf osc. t itp t krd t itp t krd t kid t itp t krd low 3 2 6 5 h/p mute dtmf hks key in t/p mute t kid t td high osc. osc. osc. t itp t krd t itp t krd t kid t itp t krd low 3 2 6 5 dtmf t fkd 300 ms figure 2(b) tone mode timing diagram (normal dialing with lock function)
w91f840n series - 18 - timing waveforms, continued t td high osc. t itp low r/p on hook t kid t itp t t < t ohd dp dtmf osc. kt h/p mute hks key in t/p mute figure 2(c) tone mode timing diagram (auto dialing without lock) t td high osc. t itp low r/p t fkd t kid t itp t t < t ohd dp dtmf osc. h/p mute hks key in t/p mute figure 2(d) tone mo de timing diagram (auto dialing with lock function)
w91f840n series publication release date: july 1999 - 19 - revision a2 timing waveforms, continued t td high osc. t itp low r/p on hook t kid t t > t ohd (return to initial state) dp dtmf osc. kt h/p mute hks key in t/p mute figure 2(e) tone mode timing diagram with on - hook debounce (auto dialing) high chip enable t/p mute h/p mute low hks h key off hook on hook note: the h key can not be enabled during chip dissable. hfi hfo figure 3(a)
w91f840n series - 20 - timing waveforms, continued high off hook chip enable t/p mute h/p mute hks h key hfi hfo figur e 3(b) note: the h key and hfi inputs will toggle the hfo signal. the first time hfi or h key are activated, the hfo signal will go high and the previous active input will be neglected. high on hook chip enable t/p mute h/p mute hks h key hfi hfo figure 3(c) note: the hks signal change of state from high to low will initialize both the hfo and h/p mute signals.
w91f840n series publication release date: july 1999 - 21 - revision a2 timing waveforms, continued 4 b m t idp t pdp low osc. dp chip enable dtmf osc. on hook fkd t kid t t t w91f840n series - 22 - timing wavefo rms, continued 4 2 t kid b m t idp t idp t pdp t idp t pdp low osc. hks key in dp t/p mute h/p mute dtmf osc. m b kt r/p 2 t p figure 6 pause function timing diagram (without lock function) 4 2 t kid b m t idp t idp t pdp osc. hks key in dp t/p mute h/p mute dtmf osc. m b kt */t 8 t p t itp figure 7. pulse to tone function timing diagram(without lock function)
w91f840n series publication release date: july 1999 - 23 - revision a2 timing waveforms, continued fn t kid osc. hks key in dp t/p mute h/p mute dtmf osc. kt t fb low low t fp figure 8 flash operation timing diagram headquarters no. 4, creation rd. iii, science-based industrial park, hsinchu, taiwan tel: 886-3-5770066 fax: 886-3-5792766 http://www.winbond.com.tw/ voice & fax-on-demand: 886-2-27197006 taipei office 11f, no. 115, sec. 3, min-sheng east rd., taipei, taiwan tel: 886-2-27190505 fax: 886-2-27197502 winbond electronics (h.k.) ltd. rm. 803, world trade square, tower ii, 123 hoi bun rd., kwun tong, kowloon, hong kong tel: 852-27513100 fax: 852-27552064 winbond electronics north america corp. winbond memory lab. winbond microelectronics corp. winbond systems lab. 2727 n. first street, san jose, ca 95134, u.s.a. tel: 408-9436666 fax: 408-5441798 note: all data and specifications are subject to change without notice.

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