UM91214B equivalent - Electronic Circuits Projects Diagrams Free

say_hoe · 11th February 2003, 09:12 AM

Is anyone know what is the equivalent IC of UM91214B and KT3170??UM91214B is dual tone multi frequency(DTMF) generator.KT3170 is a DTMF to BCD converter. What is the manufacturer of those IC? Where can I get them? Thank you.

Sebi · 11th February 2003, 09:05 PM

UM...is from United Microeledtronics Corp.,KT.. from Samsung,but discontinued. For DTMF decoding i recommend MT8870 from Zarlink.
UM91214 have stand-alone feature:the mixed tone+pulse redial. If You don`t need these function, use MT8880.

Pilot · 12th February 2003, 10:58 PM

Have a look at the posts in.........

http://www.electro-tech-online.com/viewtopic.php?t=576

It might help.
:lol:

**kinjalgp** · 13th February 2003, 08:56 AM

If you don't find the above mentioned ICs for DTMF generation, you can also use UM95089. And CM8870 for decoding.

pkshima · 19th February 2003, 04:48 PM

hi all,

does anyone know how to interface UM91214B to a computer.
cant i directly connect it.

also is there any difference between UM91214A and UM91214B ?
please dont suggest any other dtmf chip as none else is available here.

thx in advance

Pradeep K. Shima

**kinjalgp** · 19th February 2003, 05:43 PM

Hi,
Connect the switch inputs of UM91214 to the data pins of your parallel port. Give proper 1 and 0 signals to these pins as if you are simulating a matrix key-pad. Thats it. Nothing more is required.

pkshima · 19th February 2003, 06:02 PM

hi kinjal,

u mean if i want row 1 and col 1 dtmf tone,
i simply put 1 on both the row 1 and col 1 pin ?

thx a lot,
bye

pkshima · 21st February 2003, 04:46 PM

hi kinjal,

u mean if i want row 1 and col 1 dtmf tone,
i simply put 1 on both the row 1 and col 1 pin ?

u sure. i read somewhere u r supposed to short the
required row and col pins. this wud mean that some current flows
into and out of the pins. wont that blow up the parallel port ?

thx a lot,
bye

Sebi · 21st February 2003, 08:17 PM

You can make this only with optocouplers or analog switches. When a button pressed on a crosspoint, started a scanning, (outputs producing shifted phase square wawe) and this signal go to input.

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11th February 2003, 09:12 AM	(permalink)
say_hoe	UM91214B equivalent Is anyone know what is the equivalent IC of UM91214B and KT3170??UM91214B is dual tone multi frequency(DTMF) generator.KT3170 is a DTMF to BCD converter. What is the manufacturer of those IC? Where can I get them? Thank you.

11th February 2003, 09:05 PM	(permalink)
Sebi	UM...is from United Microeledtronics Corp.,KT.. from Samsung,but discontinued. For DTMF decoding i recommend MT8870 from Zarlink. UM91214 have stand-alone feature:the mixed tone+pulse redial. If You don`t need these function, use MT8880.

12th February 2003, 10:58 PM	(permalink)
Pilot	Have a look at the posts in......... http://www.electro-tech-online.com/viewtopic.php?t=576 It might help. :lol:

13th February 2003, 08:56 AM	(permalink)
kinjalgp	If you don't find the above mentioned ICs for DTMF generation, you can also use UM95089. And CM8870 for decoding. __________________ "There is no way to peace, peace is the way!"

19th February 2003, 04:48 PM	(permalink)
pkshima	hi all, does anyone know how to interface UM91214B to a computer. cant i directly connect it. also is there any difference between UM91214A and UM91214B ? please dont suggest any other dtmf chip as none else is available here. thx in advance Pradeep K. Shima __________________ Its not the Practice that makes a man perfect. Its the Man who makes the practice perfect ----- Pradeep K. Shima -----

19th February 2003, 05:43 PM	(permalink)
kinjalgp	Hi, Connect the switch inputs of UM91214 to the data pins of your parallel port. Give proper 1 and 0 signals to these pins as if you are simulating a matrix key-pad. Thats it. Nothing more is required. __________________ "There is no way to peace, peace is the way!"

19th February 2003, 06:02 PM	(permalink)
pkshima	hi kinjal, u mean if i want row 1 and col 1 dtmf tone, i simply put 1 on both the row 1 and col 1 pin ? thx a lot, bye __________________ Its not the Practice that makes a man perfect. Its the Man who makes the practice perfect ----- Pradeep K. Shima -----

21st February 2003, 04:46 PM	(permalink)
pkshima	hi kinjal, u mean if i want row 1 and col 1 dtmf tone, i simply put 1 on both the row 1 and col 1 pin ? u sure. i read somewhere u r supposed to short the required row and col pins. this wud mean that some current flows into and out of the pins. wont that blow up the parallel port ? thx a lot, bye __________________ Its not the Practice that makes a man perfect. Its the Man who makes the practice perfect ----- Pradeep K. Shima -----

21st February 2003, 08:17 PM	(permalink)
Sebi	You can make this only with optocouplers or analog switches. When a button pressed on a crosspoint, started a scanning, (outputs producing shifted phase square wawe) and this signal go to input.