Silicon Serial Number ic

Has someone a good suggestion of a silicon serial number ic with the least bits configurable?

I need for my design a unique serial number but one of the least bits should be set by a dip-switches to indicate their physical location.

0 michaelkellett over 11 years ago

Are you at the stage where you can choose the processor - some of the latest ST ARM Cortex parts have a built in unique ID.

Failing that there are Dallas (now owned by Maxim) 1 wire eeproms with a unique ID and eeprom built in.

MAXIM INTEGRATED PRODUCTS - DS2431+ - IC, EEPROM, 1KB, 1-WIRE, TO-923

Image is for illustrative purposes only.
Please refer to product description

Manufacturer:
MAXIM INTEGRATED PRODUCTS
Order Code:
1606350
Manufacturer Part No:
DS2431+

Technical Data Sheet (368.68KB) EN
MK
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0 Former Member over 11 years ago

5 Silicon Serial Number IC products found
http://uk.farnell.com/special-function/ic-function/silicon-serial-number-ic/pg/110197076
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0 michaelkellett over 11 years ago in reply to Former Member

None of these parts (the Silicon Serial Number chips) offer any means for setting bits to a user pattern and the eeprom part doesn't really do what the OP wanted.

You could use a tiny micro like this with a unique ID built in:

NXP - LPC811M001JDH16FP - MCU, 32BIT, CORTEX-M0+, 30MHZ, TSSOP-16

Image is for illustrative purposes only.
Please refer to product description

Manufacturer:
NXP
Order Code:
2320693
Manufacturer Part No:
LPC811M001JDH16FP

Technical Data Sheet (560.89KB) EN
But you would need to programme each one - it would have no trouble reading DIL switch and maybe doing something else as well. Cheaper than the Maxim parts too.
MK
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0 Former Member over 11 years ago in reply to michaelkellett

Thanks for your efforts to help me, I will consider the options!
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0 michaelkellett over 11 years ago in reply to Former Member

No bother - if you go the tiny processor route please let us know because it's rather interesting that it might make economic sense to use a 32 bit micro for such a mundane purpose.

MK
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0 Former Member over 11 years ago in reply to michaelkellett

perhaps an ATtiny or a PIC12Fnnnn would be just as good and even cheaper. Definately agree that it's getting interesting when it actually makes sense to use a micro for stuff like this. I expect it'll become more common in the future too.
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0 michaelkellett over 11 years ago in reply to Former Member

Do the ATtiny or the PIC have their own unique ID burnt in during manufacture ?

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0 Former Member over 11 years ago in reply to michaelkellett

probably not, but given you'll have to program your code in anyway, it may not be an issue, you can usually code protect these things to some degree for a bit more security if necessary
unique ID is a strange area, I've come across an I2C RTC chip that has a factory programmed EUI-64, so there are ways to get that done cheaply. It's the need to change some part of the returned ID via dip switches that gets you thinking about micros.

What about one or more 74HC165 shift registers ? Configure some of the parallel inputs with resistors and some via dip switches? Sure, it's horrible to manufacture a unique ID by resistor placement, but then Tom didn't say if he's building 2, 10, 100k or many millions. The simple approach could work if he's only building a handful.
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0 Former Member over 11 years ago

Sometimes you take component features for matter of course but after a while you realize that specific feature of ic is not existing.
I forward this to our project group and they consider that family identification was more important than unit-unique-ID.

So at this time, we skip the unit-unique-id and only use a dip-switch family settable ID and for that task I probably use a I2C I/O expander IC connected to the dip-switch.
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Silicon Serial Number ic

MAXIM INTEGRATED PRODUCTS - DS2431+ - IC, EEPROM, 1KB, 1-WIRE, TO-923

NXP - LPC811M001JDH16FP - MCU, 32BIT, CORTEX-M0+, 30MHZ, TSSOP-16