09-17-2014, 03:32 PM | #11 |
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I stand corrected
Picture me surprised. Guess I'm not to old to learn something new.
Thank you for teaching me. |
09-17-2014, 03:50 PM | #12 |
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Right you are. I'm not really sure what that battery is doing, since this is non-volatile memory. It's interesting that the specification sheet says (about the battery):
"if the lithium is exhausted for any reason, the ROM can still be read normally." Apparently, the battery is only needed if you are changing the contents - because of the two-step programming process. |
09-18-2014, 02:39 PM | #13 |
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Guess I am not too old to teach
May be this is why I am also a teacher BR, R |
09-18-2014, 09:47 PM | #14 | |
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Quote:
The Battery is not related to programming it is because this kind of I-button has NVM (internal SRAM) - this holds the memory of SRAM and another oscillator , my assumption is that if battery is dead this key will not work any more Thanks, R |
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09-18-2014, 10:16 PM | #15 |
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So, you are disagreeing with the specifications?
"4096 bits of read/write nonvolatile memory. " "Memory 4K Bits Memory Type NV SRAM" http://en.wikipedia.org/wiki/NvSRAM And quoting Page 2 of the Specification Sheet at http://www.embeddeddatasystems.com/a...992-DS1993.pdf "The block diagram (Figure 1) shows the parasite-powered circuitry. This circuitry steals power whenever the data input is high. The data line provides sufficient power as long as the specified timing and voltage requirements are met. The advantages of parasite power are two-fold: 1) by parasiting off this input, lithium is conserved, and 2) if the lithium is exhausted for any reason, the ROM can still be read normally." [lithium = lithium battery] Perhaps you are correct. Maybe they are just referring to the front-end ROM (serial number, etc.) and not the NVRAM. I have just never heard of that failure mode. I'll have to ask my friend who works at ibuttonlink about that. And my 2005-vintage Segway keys are doing just fine (so far). Last edited by dale@thecoys.net; 09-18-2014 at 10:25 PM.. |
09-19-2014, 11:06 AM | #16 | |
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Quote:
Catch me in 2016 I got data from engineers directly Thanks, R |
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09-19-2014, 11:26 AM | #17 |
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Actually, I have a "backup plan". A few years ago, I wanted to make "blue keys" for my two XTs. I wanted to customize the parameters. Speed the same as the "full speed" key, but less sensitive turn rate (i.e., finer/easier control of turns). So, I purchased the hardware, got the software, bought some ibuttons, and did that. And also stored the "serial number" settings from the original buttons.
So, if/when the "original" buttons quit working, I can just buy some more buttons, and program them. |
09-19-2014, 04:23 PM | #18 |
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Not that I doubted the answer supplied by Curious1:
My source at ibuttonlink.com confirms that - if the battery dies, only the ROM of the ibutton can be read. That's essentially only the unique serial number of the button, and has nothing to do with the Segway. Of course, the internal NV SRAM still has the Segway key data. So, just use a tiny can opener, open the button, and replace the battery...... |
09-19-2014, 05:28 PM | #19 |
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battery
Hi,
The battery is weld to some metal, You can hardly separate the parts, It is almost impossible to replace to new battery (it was not build for battery replacement) If you will look again at the picture I sent you will see one battery inside and another on the side (I have tried to replace it), any way the key did not work (however I don't know for sure if the fault reason from the beginning is related to battery, since the battery was not empty) Thanks, R |
09-19-2014, 06:47 PM | #20 |
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My comment was meant to be a bit sarcastic.
And I certainly don't think it would be simple. And if you could do the replacement, then you would have to figure out how to get it to "connect" properly to one of the fixtures used for reading/programming. I'm quite glad that I have the capability to make new keys for my XTs, without having to have an old key to copy. |
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