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_spaz
Joined: 01 Sep 2004 Posts: 2
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Posted: Wed Sep 01, 2004 10:27 am Post subject: Any 2K eeprom ?? |
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Hi,
Will any 2K eeprom work for the URC8017? thanks... |
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The Robman Site Owner
Joined: 01 Aug 2003 Posts: 21238 Location: Chicago, IL |
Posted: Wed Sep 01, 2004 12:58 pm Post subject: |
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Remember that the 2k refers to BYTES not BITS. Chips are usually labelled for the number of bits that they hold, so 2k bytes = 16k bits.
The part number you should look for is 24C16 (where the middle letter is sometimes different). You also want to look for a surface mount part (ie, SOIC rather than DIP). _________________ Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help! |
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johnsfine Site Admin
Joined: 10 Aug 2003 Posts: 4766 Location: Bedford, MA |
Posted: Wed Sep 01, 2004 1:17 pm Post subject: |
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In theory JP1 remotes require lower power eeproms than you might find for non battery powered applications. Some people have used eeproms for JP1 well outside their spec'ed operating range without serious problems. But I'd suggest looking at specs and selecting one at least close to being in spec.
In the 8017 the eeprom will be operated a 2 to 3 volts. That is below the voltage spec for many eeproms and I'd try to avoid those. Other eeproms are spec'ed as working at those voltages but needing slower write operations than they would need at full voltage. Don't worry about that. The eeprom write processes all go at the chip's speed and are very tollerant (won't easily time out) if the chip is slower than typical. |
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johnsfine Site Admin
Joined: 10 Aug 2003 Posts: 4766 Location: Bedford, MA |
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_spaz
Joined: 01 Sep 2004 Posts: 2
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Posted: Thu Sep 02, 2004 9:37 am Post subject: |
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Great, thanks for the info guys...
so with that said, where can I get one of these. Can't seem to find them at Radio Shack....any recommendations?
thanks. |
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AlphaWolf
Joined: 02 Sep 2004 Posts: 2
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Posted: Thu Sep 02, 2004 6:45 pm Post subject: |
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Anybody know if a 27C would work instead? (I don't know the difference between 24C and 27C) |
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Mark Pierson Expert
Joined: 03 Aug 2003 Posts: 3017 Location: Connecticut, USA |
Posted: Thu Sep 02, 2004 7:20 pm Post subject: |
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A 27Cxx in an OTP (One Time Programmable) EPROM and won't work. A 24Cxx is a serial (I2C) EEPROM with I/O capabilities required by JP1 remotes. _________________ Mark
Last edited by Mark Pierson on Fri Sep 03, 2004 5:35 am; edited 1 time in total |
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zaphod7501
Joined: 02 Aug 2004 Posts: 534 Location: Peoria Illinois |
Posted: Thu Sep 02, 2004 9:30 pm Post subject: |
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Sony uses the M24C16-MN6T(A) in many of their late model TVs which seems to work but would be a little expensive ($10) unless you happen to have a junk TV chassis laying around (which I did). This is an STMicroelectronics version I believe. There could be voltage issues but mine seems to be working for now. If you found a Sony servicer in a large city he might have some around since we normally swap the old eeprom onto a new board to avoid having to go through setup procedures. _________________ Just call me Zaphod (or Steve) --- I never should have started using numbers in a screen name but I just can't stop now. |
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classicsat
Joined: 20 Feb 2004 Posts: 279
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Posted: Mon Sep 06, 2004 5:20 pm Post subject: |
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You might be able to rip something from old cell phones. Not too old though, as most the real old ones use either dinky EEPROMs, SPI 96Cxx EEOPROMs, and/or ones in full sized DIP packages. When I can, I could take the 24c32 EEPROM from a somewhat recent (97-97-98 era) phone. |
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AlphaWolf
Joined: 02 Sep 2004 Posts: 2
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Posted: Sat Sep 18, 2004 1:59 am Post subject: |
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zaphod7501 wrote: | Sony uses the M24C16-MN6T(A) in many of their late model TVs which seems to work but would be a little expensive ($10) unless you happen to have a junk TV chassis laying around (which I did). |
Know anything about this part? M24C16-WBN6
I found it for $2 at a place that I am about to order other stuff from anyways, so the shipping wont be a problem. They also have M24C16-MN6T for $9. Both of these parts are made by panasonic apparently. I don't really care which is better quality, just so long as it works. |
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zaphod7501
Joined: 02 Aug 2004 Posts: 534 Location: Peoria Illinois |
Posted: Sat Sep 18, 2004 11:42 am Post subject: |
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That's a DIP package (has through hole pins) . You'd probably have to mount it on a daughter board and connect with lead wires. The M24c16-MN6T is the Sony memory chip , technically it's a 5 volt device but did work for me in a URC6131 (some specs just list it as a 5.5 volt max device with no lower voltage rating). The -WMN6 version is the low voltage type. The M24 designates a STMicroelectronics manufactured device , the "W" is the low voltage version.
I suspect you're looking at MCM Electronics (I have an open account with them -- I order on a weekly basis). They claim to have picked up the STMicro product line so they should have access to the M24c16-WMN6 chip. You'd probably have to ask them specifically about it.
You're looking for a 2 wire serial bus or I2C bus , 16k (2kx8) , SO-8 or SOIC-8 package , 2.5 - 5 volt , serial eeprom. There are a lot of manufacturers which is why they can be so cheap. My UEI "official" upgrade was a Catylyst 24WC08j , half size , so I just re-upgraded them.
Mouser Electronics has the data sheets for most of the various eeproms available. I ended up with the Catalyst (CAT24WC16J -- $0.61) from them. I also ordered dip headers for the PC board and Molex connectors and pins for the interface. You can get the parallel port shell there too. If you're thinking about the future and may end up with more than one JP1 remote you can buy a lot of upgrades cheaply. Mouser has no minimum and actual shipping costs only. _________________ Just call me Zaphod (or Steve) --- I never should have started using numbers in a screen name but I just can't stop now. |
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gfoster
Joined: 16 Oct 2004 Posts: 10
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Posted: Sat Oct 16, 2004 7:53 am Post subject: |
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Found the following on a REALLY old celphone:
CAT24C16J14
Will this do the trick ?
Greg. |
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zaphod7501
Joined: 02 Aug 2004 Posts: 534 Location: Peoria Illinois |
Posted: Sat Oct 16, 2004 12:51 pm Post subject: |
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Probably but I couldn't find any spec sheets on the Catalyst 24c16 series , only on the 24wc16 series. Since the chip manufacturers seem to be phasing out the 5.5 volt versions and directly substituting 1.5 or 2.5 volt versions (since they work on the higher voltages also) ; I suspect this is a 5 or 6 volt device which may or may not accept writen data reliably. The parallel port voltages on your PC may determine the success of using it (batteries in , batteries out , other computer , etc for test options). I would suggest not pushing ANY keys prior to a reset with a JP1 cable and IR.exe or an upload with a correct (for your remote) eeprom image. _________________ Just call me Zaphod (or Steve) --- I never should have started using numbers in a screen name but I just can't stop now. |
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