Help to identify a chip - Electronic Circuits Projects Diagrams Free

nicky314 · 28th May 2009, 09:00 PM

I request your help in order to identify a microcontroller chip which is in a board I have to repair. I have been browsing a lot of datasheets from Microchip and Phillips and none fits:

Total number of pins: 14
Power VDD: pin 4
GND Vss: pin 11
pins 1,2,3, and 13 and 14: data input
pins 6, 9 and 10: data output
Pins 7, 8 and 12 are not connected on my board.

Most of datasheets I have seen from Microchip have Vdd on pin 1 and Gnd on pin 14 which is not the case on my circuit.

Any ideas will be welcomed.

Thanks

kpatz · 28th May 2009, 09:14 PM

There are no numbers printed on the chip package?

nicky314 · 28th May 2009, 10:24 PM

No numbers or reference at all. It has been erased.

blueroomelectronics · 28th May 2009, 10:38 PM

If it is a microcontroller and the part numbers sanded off you can bet the IC is copy protected.

ronsimpson · 28th May 2009, 10:44 PM

What circuit? What does it do (did)?

nicky314 · 28th May 2009, 10:45 PM

It doesn´t matter if I can´t copy the contents.
What I am thinking is to prepare a new program myself.
I would prefer not to use a different microcontroller from the one on the circuit.
Regards.

nicky314 · 28th May 2009, 10:47 PM

The circuit is a remote control. Only has a multitone dtmf decoder, the IC I think is the microcontroler and one output relay.

blueroomelectronics · 28th May 2009, 10:52 PM

Pick a microcontroller you're familiar with and make a carrier PCB.

It might be a simple DTMf IC.

**Nigel Goodwin** · 29th May 2009, 09:11 AM

Assuming it's a micro-controller, it would certainly be copy protected, so there seems little point in erasing the number off of it. It's more likely to be a standard chip, which is why erasing it's number makes more sense.

If it's DTMF remote control, presumably it's really old?, as the crude DTMF system was only ever used for a short period, probably 25-30 years ago?.

nicky314 · 29th May 2009, 05:18 PM

Nigel Goodwin wrote:" Assuming it's a micro-controller, it would certainly be copy protected, so there seems little point in erasing the number off of it. It's more likely to be a standard chip, which is why erasing it's number makes more sense."

Yes, your point is very interesting. But I don´t see how to do with a single chip - not being a microcontroller- the following:
A sequencial 4-digit ( 4 tones) password is received at the dtmf decoder which passes to the microcontroller different codes for each tone. if the password is correct then wait for a tone and depending on which tone, command a relay. If tone is #1 then set on relay #1, if tone is #2 then set on relay 2. Also if tone is #3 then set off relay #1 and so on...

Can this be achieved with a single chip (leaving dtmf tone decoding apart ) ?

blueroomelectronics · 29th May 2009, 05:23 PM

Sure it could even be a custom chip. What's it out of?

**Nigel Goodwin** · 29th May 2009, 05:26 PM

It could well be a microcontroller, but there seems no reason to destroy it's markings if it is one.

So you have a DTMF decoder chip, and this outputs the value of the button pressed, presumably as a digital value on a four bit bus? - and passes that value to the next chip.

An extra concern for it not been a microcontoller is the absense of any clock components.

Sceadwian · 29th May 2009, 06:12 PM

Nigel, security through obfuscation, very effective. I do agree though that the chances of it being a micro controller aren't very high. With no markings there's nothing left to go on.

be80be · 30th May 2009, 05:06 AM

I never seen a micro controller sanded off. Number over but not sanded.

Quote:

board I have to repair. I have been browsing a lot of datasheets from Microchip and Phillips and none fits:

If you have to repair and don't no what chip it is how do you no

Quote:

So you have a DTMF decoder chip

whats it in

nicky314 · 1st June 2009, 09:47 AM

Quote:

So you have a DTMF decoder chip, and this outputs the value of the button pressed, presumably as a digital value on a four bit bus? - and passes that value to the next chip.

Exactly like you say.

Quote:

An extra concern for it not been a microcontoller is the absense of any clock components

There is a xtal connected to dtmf decoder.

So, going back to my first post, anyone knows the reference of a 14 pin microcontroller with Vdd on pin 4 and gnd on pin 11 ?

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28th May 2009, 09:00 PM	#1
nicky314	Help to identify a chip I request your help in order to identify a microcontroller chip which is in a board I have to repair. I have been browsing a lot of datasheets from Microchip and Phillips and none fits: Total number of pins: 14 Power VDD: pin 4 GND Vss: pin 11 pins 1,2,3, and 13 and 14: data input pins 6, 9 and 10: data output Pins 7, 8 and 12 are not connected on my board. Most of datasheets I have seen from Microchip have Vdd on pin 1 and Gnd on pin 14 which is not the case on my circuit. Any ideas will be welcomed. Thanks

28th May 2009, 09:14 PM	#2
kpatz	There are no numbers printed on the chip package?

28th May 2009, 10:24 PM	#3
nicky314	No numbers or reference at all. It has been erased.

28th May 2009, 10:38 PM	#4
blueroomelectronics	If it is a microcontroller and the part numbers sanded off you can bet the IC is copy protected. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

28th May 2009, 10:44 PM	#5
ronsimpson	What circuit? What does it do (did)?

28th May 2009, 10:45 PM	#6
nicky314	It doesn´t matter if I can´t copy the contents. What I am thinking is to prepare a new program myself. I would prefer not to use a different microcontroller from the one on the circuit. Regards.

28th May 2009, 10:47 PM	#7
nicky314	The circuit is a remote control. Only has a multitone dtmf decoder, the IC I think is the microcontroler and one output relay.

28th May 2009, 10:52 PM	#8
blueroomelectronics	Pick a microcontroller you're familiar with and make a carrier PCB. It might be a simple DTMf IC. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

29th May 2009, 09:11 AM	#9
Nigel Goodwin	Assuming it's a micro-controller, it would certainly be copy protected, so there seems little point in erasing the number off of it. It's more likely to be a standard chip, which is why erasing it's number makes more sense. If it's DTMF remote control, presumably it's really old?, as the crude DTMF system was only ever used for a short period, probably 25-30 years ago?. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

29th May 2009, 05:18 PM	#10
nicky314	Nigel Goodwin wrote:" Assuming it's a micro-controller, it would certainly be copy protected, so there seems little point in erasing the number off of it. It's more likely to be a standard chip, which is why erasing it's number makes more sense." Yes, your point is very interesting. But I don´t see how to do with a single chip - not being a microcontroller- the following: A sequencial 4-digit ( 4 tones) password is received at the dtmf decoder which passes to the microcontroller different codes for each tone. if the password is correct then wait for a tone and depending on which tone, command a relay. If tone is #1 then set on relay #1, if tone is #2 then set on relay 2. Also if tone is #3 then set off relay #1 and so on... Can this be achieved with a single chip (leaving dtmf tone decoding apart ) ?

29th May 2009, 05:23 PM	#11
blueroomelectronics	Sure it could even be a custom chip. What's it out of? __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

29th May 2009, 05:26 PM	#12
Nigel Goodwin	It could well be a microcontroller, but there seems no reason to destroy it's markings if it is one. So you have a DTMF decoder chip, and this outputs the value of the button pressed, presumably as a digital value on a four bit bus? - and passes that value to the next chip. An extra concern for it not been a microcontoller is the absense of any clock components. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

29th May 2009, 06:12 PM	#13
Sceadwian	Nigel, security through obfuscation, very effective. I do agree though that the chances of it being a micro controller aren't very high. With no markings there's nothing left to go on. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."