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1 * this specification are subject to be changed without notice. 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary general description the em91865 are 13 memory tone/pulse switchable dialer with last number redail (lnb) and save function, which are fabricate in cmos technology with wide operating voltage for both tone and pulse mode. em91865 consumes very low memory retention current in on hook state. the em91865 provide necessary functions of telephone set for application in any environment, such as pulse dialing, tone (dtmf)dialing, handfree dialing. beside this, hold, mute and redial function are provide for particular operation. in redial mode em91865 can auto insert pause time for application in pabx system. em91865 also have a special i/o pin - vao can used to control the receive volume amplify circuit. features ? volume add control function. ? one key redial function. ? flash key is available and have multiple flash time ( 600 ms, 300 ms, 100 ms ) can be selected. ? auto insert pause time. ? tone/pulse switchable. ? pulse mode fixed 10pps. ? pulse to tone ( p ? t ) key is provided for pabx operation. ? many options can be selected by r option. mode ( pulse, tone ) m/b ratio ( 40:60 ; 33:66 ) auto insert pause time ( enable ; disable ) ? 13 sets 16 digits one touch memory, or 3 set one touch and ten set two touch 16 digits memory. ? one set 32 digits save function. ? one set 32 digits lnb redial function. ? mixed and cascaded dialing. ? hold and mute function. ? hand free dialing. ? tone duration and inter -tone pause are fixed at 90 ms. ? flash pause time are fixed at 600 ms. ? pulse to tone pause time are fixed at 3.6sec. ? uses 3.579545 mhz crystal or ceramic resonator (with built-in capacitor, no need extra capacitor). ? package in dip 18 or dip 16. total system ? operating voltage : 2.0v ~ 5.5v ? operating current : tone mode 0.3 ma (typical) ~ 0.5 ma pulse mode 0.15 ma (typical) ~ 0.2 ma ? standby current : 0.01 ua ( typical ) 0.1 ua ( max. ) ? use single clock 3.579545 mhz crystal
* this specification are subject to be changed without notice. 2 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary pin assignments pin descriptions symbol function k2 , k3 , k5 ~ k8 key board scan i/o pins, key scans by ripple way. i/o pin these pins output 16k hz signal one by one and periodically for key board scan. k1/hdo this pin has two functions normally this pin will be a key board scan pins function same as k1~k8. in hold condition this pin will stay in "high" level to control the hold circuit and scan hd input key. in hold condition all key will not allow keying except hd, hf and hook switch. k4/muteo this pin has two functions normally this pin will be a key board scan pins function same as k1~k8. in mute condition this pin will stay in "high" level and output signal with the inverse of key scan to control the mute circuit and scan input key. any key input will release mute condition. k6/xmute this pin has two functions normally this pin will be a key board scan pins function same as k1~k8. the tone/pulse dialing mute signal output pin. this pin will switch to "high" level during tone/pulse dialing and hold function. otherwise, this pin dc level stays "low". vdd, vss positive and negative power supply input pin xin, xout oscillator input and output pins, built in two 5pf capacitor so it's not need external capacitor. a 3.579545 mhz crystal must be crossed between xin and xout. hfi handfree function input pin accepts rising edge signal to turn "on" or turn "off" handfree function. this pin is hysteresis input structure and built-in pull down resistor (typically 200 k w ) . hfo handfree outputs pin that is designed to control telephone line for on-hook dialing or control speakerphone circuit for handfree conversation. when handfree function is executed, this pin will switch to "high". otherwise, this pin stays "low" level. hks hook switch detects input pin, which is hysteresis input structure and without internal pull up resistor. dtmf dtmf (dual tone multi-frequency) output pin, in tone dialing mode, this pin will output dtmf signal that is corresponding to key board 0~9, *, # key. po pulse signal output pin that is nmos open-drain. this pin is for pulse dialing. this output is "low" during pulse dialing blank duration and flash operation active, otherwise will be "high impedance". vao volume add output pin , which is open drain structure. normally this pin will stay in "high impedance". when volume add active and dialer in off- hook mode operting then this pin will output "low". k7 k6/xmute k5 k4/muteo xin xout vss vao 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 k8 k3 k2 k1/hdo dtmf po hks vdd em91865a EM91865B k7 k6/xmute k5 k4/muteo xin xout vss vao hfi 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 k8 k3 k2 k1/hdo dtmf po hks vdd hfo
3 * this specification are subject to be changed without notice. 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary key assignment : em2 m1 hd save 123 45 6 78 9 */t 0 # m9 m0 st mute rd em3 em1 m2 m3 m4 m7 va m6 m5 f1 f2 f3 m8 hdo muteo r_option r_option xmute p rc k1 k2 k3 k4 k5 k6 k7 k8 r r r keyboard description : key description 0~9, *, # digit key f1, f2, f3 flash key, flash time f1=600ms f2=300ms f3=100ms */t in pulse mode, this key mean pulse to tone function key rd redial and one key redial key p pause key. hd hold function key, at hold mode to key in "hd" key will go to idle on-hook state hf handfree function key save save function key st store memory function key em1~em3, m1~m10 one touch memory function key rc recall key for two touch memory recall va volume add key. mute mute key. when this key be pressed muteo output will be "high", and any key-in will release mute.
* this specification are subject to be changed without notice. 4 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary function descriptions dialer option selection the em91865 incorporated a special keyboard scanning function that is connecting a resistor ( typically is 560 k w ) on keyboard scan pin to select many telephone specifications. the specifications are described as follow : a. m/b ratio k2 m/b ratio nr 40:60 r-vss 33:66 b. auto insert pause time d. mode k3 auto insert k5 mode pause time nr disable nr tone r-vss enable r-vss pulse normal dialing : press the digital key directly on keyboard which number can be dialing out and stored in lnb memory auto matically. operating procedure described as following: ? to select pulse or tone mode. ? off-hook or turn on hf function. ? keying d1,d2,....dn. the "d" expressed digital key pressed that include 1~9, *, 0, #, p, and p ? t keys. the "n" expressed unlimited. ? the numbers d1,d2,......, dn will be dialed out in pulse or tone mode as selection. lnb redial function : storing : in normal dialing mode, every digital key was entry which number will be stored in lnb memory automatically. if entry digits are more than 32 digits, the redial function of lnb memory will be disabled, otherwise, these numbers stored in lnb memory can be redial output. redialing : em91865 provide redial and one key redial function (1) redial function off-hook normal dialing directly keying "f" key (or on-off hook once) and key-in "rd" keyboard. the numbers stored in lnb memory will be dialed out. (2) one key redial function off-hook normal dialing, if busy, press the "rd" key directly then the line will be broken about 1.2 sec with trp redial pause time and dial out the numbers stored in lnb memory automatically.
5 * this specification are subject to be changed without notice. 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary auto insert pause time function em91865 provides a new function - auto insert pause time function - for pabx system user. in pabx system, we usually use a special number to identify the phone want dial out or just a internal phone. so between the first and second number, the pabx system will switch to central office, that will be few second switch time. the auto insert pause time function will auto insert the pause time between first and second digit in redialing mode. this function are provide a pause time to wait pabx switch to central office. in fact, the pause time are record the waiting time of last dialing between the first and second digit. the auto insert pause minimum duration are equal 0 second, maximun duration are equal 3.5 second, and pause duration scale are 0.1 second. so, if the time during user keying first and second digit are longer than 3.5 seconds, the auto insert pause time will be limited at 3.5 second. by this function, we can redial the correct number out in pabx system. this function can select enable or disable by r_option. pause(p) key operation the pause(p) key is designed to support pause operation in dialing duration. "p" key can be stored in memory and it will occupy one digital position. ? to select pulse or tone mode. ? off-hook(or turn on hf function), push (d1, d2,....dn, p , k1, k2, ..... ,kn). these numbers will be dialed out as following sequence : d1, d2,.....dn, tp, k1, k2, ..... ,kn (tp are the pause time) save redial memory the save memory is designed in em91865 to support digits capacity buffer for second redial, pager, special memory for memo and other system applications. storing : em91865 support two operating methods to store numbers into save redial memory. method 1 : ? to select pulse or tone mode. ? off-hook(or turn on hf function), push d1 , d2 ....., dn . the numbers d1, d2,..., dn will be dialed out in pulse or tone mode as selection. ? after dn had been dialed out and push [st]. save key. if the keying numbers are more than 32 digits that content of save memory can not be updated. otherwise, these numbers will be stored into save memory. noted : in the [ ] key allows to be omitted. ? save buffer are the length 32 digits number. method 2 : on or off-hook (or turn on hf function), push st , d1 , d2 ....., dn , [st], save . if the keying are not over 32 digits, the numbers d1, d2, ....., dn will be stored in save redial memory automatically. dialing ? to select pulse or tone mode. ? off-hook (or turn on hf function or after executing flash function), first push save key. the numbers stored in save memory will be dialed out in pulse or tone mode as selection.
* this specification are subject to be changed without notice. 6 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary one touch memory : the em91865 incorporated 13 sets one touch memory each one can store numbers up to 16 digits. in memory storing, if stored numbers are more than 16 digits that only the previous 16 digits can be stored into specific memory. storing of 13 sets memory : on-hook or off-hook state, push (st, d1, d2,.....di, [st], emn or mn). the numbers d1, d2,....di will be stored into memory location "n", the "n" expressed digital key from 1~3 for em and 0~9 for m. dialing (after memory dialed out, the numbers of memory will copy to lnb) : ? to select pulse or tone mode. ? off-hook (or turn on hf function), push emn or mn key. the memory content will be dialed out. two touch memory : the em91865 incorporated 10 sets two touch memory each one can store numbers up to 16 digits. in memory storing, if stored numbers are more than 16 digits that only the previous 16 digits can be stored into specific memory. storing of 10 sets two touch memory : on-hook or off-hook state, push (st, d1, d2,.....dn, st, m). the numbers d1, d2,....dn will be stored into memory location "mm", the "m" expressed digital key from 0~9 map to m0~m9. dialing (after memory dialed out, the numbers of memory will copy to lnb) : ? to select pulse or tone mode. ? off-hook(or turn on hf function), push(rc , m). the memory content in mm will be dialed out. cascade dialing : let em1=1,2,3 em2=4,5,6 em3=7,8,9 at off-hook state, key in em1, em2, em3, the lnb=1,2,3,4,5,6,7,8,9, and the number will be dialed out. the max. cascade dialing numbers are 32 digits. mixing dialing : let lnb=7,8,9 m2=4,5,6 em1=1,2,3 at off-hook state, key in "rd", em1, *, 0, p, ( a , 2 ) , then the lnb=7,8,9,1,2,3,*, 0, p,4,5,6, and the number will be dialed out. pulse to tone(*/t) key operation the pulse to tone(*/t) key is designed to support toll dialing (long distance call) or pabx system operation. the "*/t" key can be stored in memory and it will be occupy one digital position. ? to select pulse mode. ? off-hook(or turn on hf function), push d1, d2,...dn, */t, k1, k2, ....,kn. these numbers will be dialed out as following sequence :
7 * this specification are subject to be changed without notice. 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary d1, d2,....dn, tpt, k1, k2, .....,kn. (tpt are the pulse to tone pause time) (pulse mode) (tone mode) flash(f=f1,f2,f3) key operation the flash key is designed to break telephone line temporarily. after key is depressed, this dialer will send a flash signal to break line and reset all condition. the flash's break time dependent on the which key be pressed, f1=600ms, f2=300ms, f3=100ms. handfree (hf) function the handfree function are provided in advance version EM91865B to support on-hook dialing and loudspeaker application which can be turn "on" or "off" by pressed again "hf" key. during handfree function is executed, the hfo pin is switched to "high". otherwise the hfo pin stays "low" level. one of the following operations can turn off handfree function (hfo pin return to "low"). ? on-off hook once. ? pressed "hf" key ? turn on hold (hd) function.(hdo pin switched to "high") hold (hd) function the hold function is designed to stop conversation temporarily. in off-hook state (or hf function is turned on), to press hd key on the keyboard, the hold function can be turned "on" (hdo pin switched to "high"). one of the following operations can turn off hold function (hdo pin switched to "low"). ? on-off hook once. ? to press hd key back to idle on_hook state ? turn on handfree (hf) function.(hfo pin switched to "high") ** in hold state all key board will be disable except "hf" , "hd" key and hks switch mute function - the em91865 provide mute function to mute microphone or antler at off-hook (or turn on hf) state. when key- in "mute" key, "muteo" pin will become "high" to mute microphone. any key-in will release mute mode and operating the correct key. volume add function em91865 provide volume add function to control the speech network for adding the receiving volume. except idle on-hook state, volume add function will working effect no matter what state is. volume add function are toggle structure. every time touch va key will inverter the vao pin condition ( h ? l ? h ? l ? .....). so volume add will active or release each time keying va. if and only if, when dialer back to the idle on_hook state then the volume add function will force to release. this solution protect the user will not be hurt by loud volume. although volume add state will not change by off_hook or hf operation but if dialer are in hf mode then volume add outpout (vao) will be inhibited. noted : except dialer back to idle state, any other operate will not reset volume add situation ( include hd, hf, flash ..... , and so on ). so volume add situation will be hold until dialer back to idle.
* this specification are subject to be changed without notice. 8 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary : hf=handfree hd=hold (1) on_hook state (2) off_hook state (4) on_hook hf state (3) off_hook hf (5) off_hook hd (6) on_hook hd hks=l hks=l hks=h hf hf hf hf hf hf hd hd hd hks=h hd hd hks=l hks=h operating flow chart truth table : operating state input / output pin level hks po xmute hfo hdo (1)on-hook, idle state h z l l l (2)off-hook line l z l l l (3)off-hook, hf line l z l h l (4)on-hook, hf line h z l h l (5)off-hook, hd line l z h l h (6)on-hook, hd line h z h l h note : z= floating (high impedance) ; h= logic "high" ; l= logic "low" level. @ = to doing r-option
9 * this specification are subject to be changed without notice. 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary absolute maximum ratings (ambient temperature is 25 o c, all voltages referenced to v ss ) items sym. rating unit power supply voltage v dd 6.0 v input voltage range v in v ss -0.3v ~ v dd +0.3v v operating temperature t opr 0 ~ +70 o c storage temperature t sto -55 ~ 150 o c power consumption p d 500 mw d.c. electrical characteristics (v ss =0v; t opr =0 o c to 70 o c, v dd =3v unless otherwise noted) parameter sym. min. typ. max. unit condition operating voltage tone v dd 2.0 - 5.5 v unload pulse 2.0 - 5.5 memory retenion 1.0 - 5.5 standby current istby - 0.001 0.1 a idle on_hook state - 0.15 0.3 ma operating current tone i dd - 0.3 0.5 ma pulse - 0.15 0.3 memory retention current imrt - 0.001 0.1 ua hks=1,vdd=1v hks , hfi vih 0.7 - 1 v dd schmitt trigger input voltage vil vss - 0.3 hfo ioh -0.2 - - ma vo=2.5v drive current sink current iol 0.2 - - vo=0.5v hfo pull down resistor rhf - 200 - k w vao ioh - - -0.01 ua vxmute=vdd leakage current sink current iol 1 - - ma vxmute=0.5v muteo , hdo , xmute ioh -270 -350 -420 ua vo=2.5v drive current sink current iol 10 20 50 vo=0.5v k2 , k3 , k6 , k7 , k8 ioh -270 -350 -420 ua vo=2.5v output current iol 10 20 50 vo=0.5v po sink current iol 1 1.5 2 ma vo=0.5v recommended operating conditions 1. supply voltage range from 2 v to 5.5 v at fc=3.58 mhz 2. operation frequency: 3.58 mhz crystal.
* this specification are subject to be changed without notice. 10 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary dtmf characteristics (v ss = 0v , v dd = 3v , topr = 0 o c to 70 o c) symbol description min. typ. max. unit twist twist=20 log(col/row) 1 2 3 db dc level vdc , vdd=2.0v~5.5v 0.55 - 0.7 vdd dist distortion - -30 -23 db ac level row group 130 155 180 mvrms sink current vdtmf=0.5v 0.2 - - ma load resistor dist<-23db 5 - - k w minimum tone duration td ( redial ) - 90 - ms minimum intertone pause titp ( redial ) - 90 - ms actual frequency output ( fosc =3.579545 hz ) standard (hz ) output ( hz ) deviation ( % ) f1 697 699 +0.28 f2 770 766 -0.52 f3 852 848 -0.47 f4 941 948 +0.74 f5 1209 1216 +0.57 f6 1336 1332 -0.30 f7 1477 1472 -0.34 parameter sym. min. typ. max. unit condition electrical characteristic (v dd -v ss =3.0v,fosc=3.58 mhz) keyin or release debounce tdb - 18 - ms pulse rate psr - 10 - pps make/break ratio mbr - 40:60 - % k2 pin=nr - 33:66 - k2 pin=r-vss inter-digit pause time tidp - 800 - ms pause time tp - 3.6 - s pulse to tone time tpt flash break time tf - 600 - f1 key - 300 - ms f2 key - 100 - f3 key flash pause time tfp - 600 - ms tone duration td - 90 - ms one key redial break time trb - 1.2 - s one key redial pause time trb - 1 - s scan wave width tsw - 1/32 - ms scan wave period tsp - 0.25 - ms key board scan period tksp - 2.25 - ms auto insert pause taip 0 - 3100 ms pre-mute time tpm - 5 - ms
11 * this specification are subject to be changed without notice. 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary timing diagram figure 1. tone mode operating timing figure 2. pulse mode operating timing 1 2 td tdb titp 3 tpm hks key xmute 12 tdb 3 xout tpm dtmf po tb tidp tidp tidp tdb hks key xmute dtmf po xout
* this specification are subject to be changed without notice. 12 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary figure 3. pulse to tone operating timing figure 4. flash operating timing figure 5. pause operating timing key xmute dtmf po 14 tone pulse 2 3 */t tpt xout key xmute po f 3 tf tfp xout dial inhibited 2 1 key xmute dtmf po 1p 2 1p2 tp tp tone mode pulse mode xout
13 * this specification are subject to be changed without notice. 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary figure 6. auto insert time operating timing figure 7. redail operating timing ( pulse mode ) hks key dtmf 0 td xout 577 97 taip hks key dtmf rd td xout 57 797 taip dialing 057797 so lnb=057797 and taip timng will be store then redial will auto insert taip timing between rd number 0 and 5 0 titp hks key xmute po (lnb=1 2 3) rd xout
* this specification are subject to be changed without notice. 14 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary figure 8. redial operating timing ( tone mode ) figure 9. one key redial operating timing ( pulse mode ) figure 10. one key redial operating timing ( tone mode ) hks key xmute (lnb=1 2 3) rd xout dtmf hks key xmute po 1 2 rd trb trp xout lnb= 1 2 hks key xmute 1 2 rd xout lnb= 1 2 dtmf po trb trp
15 * this specification are subject to be changed without notice. 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary figure 11. handfree mode one key redial operating timing ( pulse mode ) figure 12. handfree mode one key redial operating timing ( tone mode ) key xmute po 1 2 rd torf trdp xout lnb = 1 2 hfo hfi tdb hfo key xmute 1 2 rd torf trdp xout lnb = 1 2 dtmf po hfi tdb
* this specification are subject to be changed without notice. 16 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary figure 13. handfree and hold operating timing figure 14. mute operating timing hks key muteo/k4 1 2 mute xout tdb tdb dtmf xmute hfo key xmute/k6 xout hfi tdb k1/hdo hd hf hf hd hd tdb tdb hd hd hd tdb hks k2~k8
17 * this specification are subject to be changed without notice. 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary figure 15. key board scan timing figure 16. hold active key board scan timing k1 k2 k3 k4 k5 k6 k8 k7 tsw tsp tksp k1 k2 ~ k8 tsw tsp hks key hd hd tdb
* this specification are subject to be changed without notice. 18 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary figure 17. mute active key board scan timing figure 18. xmute active key board scan timing k1 k2 k3 k4 k5 k6 k8 k7 tsw tsp tksp k1 k2 k3 k5 k6 k8 k7 tsw tsp tksp k4
19 * this specification are subject to be changed without notice. 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary application circuit : control circuit hfo /po hdo tip ring off-hook on-hook speech network keyboard auto release hold function circuit vdd 0.1u 5v1 33k 1u + 47k 1u + 103 22k c945 470k 33k 104 104 1n4148 1n4148 104 1n4148 47k 16v/1w 10u + 220k c945 47k 470k 47k 240k 100k 10m hook-sw a92 3k3 a42 33k 1n4148 100k 1n4148 220k 100k 470k c945 470u + led 1n4148 10k 1k hf 104 104 1n4148 100k 1n4148 1n4148 - + 3.58m 103 100k c945 100k EM91865B k8 18 k7 1 k6/xmute 2 k5 3 k4/muteo 4 xin 5 xout 6 vss 7 vao 8 hfi 9 hfo 10 k3 17 k2 16 k1/hdo 15 dtmf 14 po 13 hks 12 vdd 11 xmute muteo hfo i_loop k4 k6 k1 dtmf k2 k3 k8 /vao k5 k7 speak_power
* this specification are subject to be changed without notice. 20 4.28.1999 em91865 13 memory tone/pulse dialer with hf, hd, redial and volume control function preliminary application circuit : keyboard and r_option em2 m1 hd save 1 23 45 6 78 9 */t 0 # m9 m0 st mute rd em3 em1 m2 m3 m4 m7 va m6 m5 f1 f2 f3 m8 560k aip t/p mbr r_option p rc k1 k2 k3 k4 k5 k6 k7 k8

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