Smbus temp sensor to read XP internal diode

[stepback]

I have designed an 8 channel SMBus temp sensor PCB. Here is what it looks like. I will be have some of these made in the next couple weeks. If any one wants ones I will sell them at cost + shipping.

[ButcherUK]

Um why do you need 3 pin connectors for sensors, they are meant to be diode-connected transistors which only have 2 wires...
On the whole though it looks nice, how much you think you could ship one to the UK for? I got my max1668's today, want to try them out and a pcb would avoid having to solder wires on.

[Hoot]

I would have guessed for the shield. It looks like pin1 on each sensor take-off is connected to ground. At least in the case of the CPU thermal diode, it is recommended that you use 2 conductor shielded cable to keep electrical noise to a minimum. On my single channel unit, which is for monitoring just the Thermal Diode in an Athlon XP, I use shielded 2 conductor audio cable. It's small and inobtrusive.

http://forums.overclockers.ws/vb/showthread.php?s=&threadid=59636

Hoot

[ButcherUK]

good point hoot :)

[SeigeAkicksass]

just if somebody dosnt mind what exactly is that?

[Sonny]

Were would I attach this if I had an XP?:o

[Hoot]

SeigeAkicksass:

The Athlon XP CPU has an internal Thermal Diode that, if monitored, will yield an accurate core temperature that is not influenced by external factors like Thermistor or Thermocouple sensors are prone to.

Stepback has designed a circuit card that enables the user to not only monitor the Thermal Diode in the XP CPU, but many diodes that can be placed around the motherboard as well.

My module is designed for just the CPU and the ambient air in the case.

----------------------------------------------------------------------------------

Sonny:

If your motherboard has room around the SMBus header, you could simply mount a 5-pin female MTA-100 connector right on Stepbacks board and plug it in. In many motherboards, there is not adequate clearance around the SMBus header to do that. In that case, I assume Stepback intends the user to attach a ribbon cable to the card which has the 5-pin female connector on the end and plug it into the SMBus header. Then you connect a 2wire shielded cable to the CPU socket pins U7, S7 and a convenient ground point and hook it into any one of the input connectors.

Here is where you connect to your KT7A-R:

Hoot

[Hoot]

Sonny, here are the SMBus headers on your motherboard. You are lucky in that you have two to choose from and they are relatively in the clear.

Hoot

[Hoot]

On my IWILL KK266+, the SMBus header is tucked in pretty tight quarters, as you can see here:

Hoot

[Hoot]

I designed my module based upon the tight fit of the IWILL KK266+ as you can see here. I can't imagine any other motherboard being being any more restrictive with the SMBus header location. The A and C connections correspond to the Thermal Diode Anode and Cathode.

http://forums.overclockers.ws/vb/showthread.php?s=&threadid=59636

Hoot

[SeigeAkicksass]

hoot- or neebody else-do you know if the soyo dragon plus has a SMBus header?
i have looked at allthe things that look like headers or jumpers and havnt found any thing like that as lfar as i can remember

dont go throught too much troughble to find it cuz i dont have an XP proc, althoguh if i ever did get one it would be nice to do that so i am just curiouse
thanks :eh?:

[Hoot]

Originally posted by SeigeAkicksass
hoot- or neebody else-do you know if the soyo dragon plus has a SMBus header?
i have looked at allthe things that look like headers or jumpers and havnt found any thing like that as lfar as i can remember


Nor will you. Despite the manual saying that the SMB Interface is fully supported, it appears that Soyo chose not to put a header on the motherboard to allow the user to access it. They still have that IR interface though. Go figure...

http://forums.overclockers.ws/vb/sh...&threadid=59636

Hoot

[ButcherUK]

You can normally pick up the SMBus off the ram sockets somewhere, where I'm not sure, I run a KT7A with it's nice dual SMBus headers :D

So anyway stepback, about the likely pricing? I'm very interested (got two of these MAX1668s on my desk, need to get them going ;)),

[ButcherUK]

A note - if you're not confident with soldering very small devices, don't try to use these chips, here's a shot of my MAX1668s -

http://www-users.york.ac.uk/~rec108/max1668.jpg

Theat's two 16-pin chips (8 pins per side) and a HDD screw for size. As you can tell these things are small. :)

[Sonny]

Originally posted by Hoot
Sonny:

If your motherboard has room around the SMBus header, you could simply mount a 5-pin female MTA-100 connector right on Stepbacks board and plug it in. In many motherboards, there is not adequate clearance around the SMBus header to do that. In that case, I assume Stepback intends the user to attach a ribbon cable to the card which has the 5-pin female connector on the end and plug it into the SMBus header. Then you connect a 2wire shielded cable to the CPU socket pins U7, S7 and a convenient ground point and hook it into any one of the input connectors.

Here is where you connect to your KT7A-R:

Hoot Hoot,

Soldering job:( I better have enough money to buy a new MoBo in the likely event I mess things up. Now I need something to practice on.

[SeigeAkicksass]

so whoul i be able to access the temps throgh softare or what?
thanks for figuring that out for me it is a good thing to know:D :eh?:

[stepback]

I'm looking at having a contract electronics shop build these. All the parts will be installed on the board. The JP1 connector is for a 5 pin cable to connect it to the mobo smbus connector. My Mobo don't have this header but i will be soldering a cable from the on board hardware monitor chip to get the smbclk and smdata signals. The 3 pin conectors are for shielding the sensor wires. Price will be under $30US, I'm waiting for the qoutes to come in.
I might get just the boards made, those should be under $10US.
These prices are just guessing. I should know more Monday or Tueday. I was trying to get a feel for how many I need to get made as the more i get the cheaper they will be.

[Hoot]

You can configure MBM to use these Maxim Chips. There may be other monitor programs out there that can access the SMB also.

http://forums.overclockers.ws/vb/sh...&threadid=59636

Hoot

[SeigeAkicksass]

cool
:D

[ButcherUK]

I'd be happy with just a board. Dallas Semiconductor charge around $6.50/chip for small orders of MAX1668s (I think they get cheaper if you order >100). I got mine free as an engineering sample ;)
So any ideas on shipping cost to me (given I'm in the UK)?

[stepback]

This board is really small 1.25 X 3 inchs. I don't think it will cost much to ship it to you. I could just snail mail it really cheap.

[ButcherUK]

Yeah if you ship as a package it's about $20 min it seems transatlantic, if it's just a board you could slip it in an envelope and just post it. :)

[stepback]

I finally got the qotes for these boards. The blank fab's are $20 for the first run of 15 boards. I'm waiting to the qoute to get 100 of these.

[JFettig]

were do these plug into? not on the cpu but how they are read?

[Hoot]

You plug them into the SMBus header on your motherboard. MBM will read the temperature from the SMBus. I could have sworn this was covered at the beginning of the thread. Many motherboards have an SMBus header, but some of the cheaper ones do not, probably to save a buck.

Hoot

[Sonny]

Originally posted by Hoot
I could have sworn this was covered at the beginning of the thread.I thought it was myself;)

[stepback]

bump

[Nitestorm]

Hmm, very nice, especially your willingness to make some up for the likes of us that don't have such electronics skill. I've mentioned this over at a forum in the UK, to see if anyone else is interested from over here.

[LDoR]

I would really like something like this. However my mobo, gigabyte GA-7DXR has connection points for the SMBus, but it doesn't have the actual pins attached to them. Anybody know how hard it would be to do that and where i could get the right type of pins. Am a UK resident BTW.

[Hoot]

They are standard .100 inch spaced pins. You can get them in strips which you cut to the number of pins you need, like 5 for the SMBus.

Though I do not use vendors in the UK, I have to believe your Electronics Manufacturing firms do. They must have equivalents to Newark, Allied, Digikey, etc over there. If there are any Electronics Surplus stores, they usually have some manufacturing over-runs on the shelves. The local ones here do.

Hoot

[LDoR]

Ok, thanks.

Another, rather dumb question is how do i attach them. Soldering, or is there something easier i can do?

[Hoot]

Usually, you solder them in. With .100 center pin strips, it's not too hard.

Hoot

[Nitestorm]

Maplin (http://www.maplin.co.uk) or RS (http://www.rswww.com) maybe stock them, but haven't checked.

[!~^G*Love^~!]

Any update on these??

I'm interested when you get a quote - let me know.

Later

G

[JFettig]

my 1700+ is on the way, and is there an external reader that i can use? because my dragon dont have a Smbus header.....

and i would like to use one of these...

[Keen]

I'm trying to hunt down a way to connect to the SMBus if your mobo doesn't have a header. I started a thread here:
http://forum.oc-forums.com/vb/showthread.php?s=&threadid=70552
If anyone has any experience with this, please help!

BTW Hoot, I can't see that thread on the Thermal Diode that you made. I keep getting told that I need to have 100 posts before I can read that forum.

[Hoot]

Originally posted by Keen
I'm trying to hunt down a way to connect to the SMBus if your mobo doesn't have a header. I started a thread here:
http://forum.oc-forums.com/vb/showthread.php?s=&threadid=70552
If anyone has any experience with this, please help!

BTW Hoot, I can't see that thread on the Thermal Diode that you made. I keep getting told that I need to have 100 posts before I can read that forum.

Here is a link to the DIMM slot pin definitions. In the bottom half, the lower left corner, there are pins labelled SCL and SDA those are the SMBus signals you need to get to.

Look here: http://www.alpha-test.com/jedec/4_5_10r9.pdf

PM me is you want to discuss it further. Sorry the Classified ad I ran turned into a good method discussion that can not be shared by everyone.

Hoot

[Keen]

Of course! The Jedec standard, how could I miss that? Thanks for the info, I'm going through it now.

edit: Found it! Looks like we need to connect to pins 91 (data) and 92 (clock). They're at the end of the longer part (with the notch being the divider), on the front side.
pin 1 -->|_____n__________|<--these last two pins need to be used.

[zoopa_man]

All I can say is I tried building one my self for my Cleron 1.2 and You guys arn't kidding. Those suckers are small. Like your eyes but out when you try to look at one pin kind of small. I got two chips from maxim I might try to rig my second chip up if I can find a large enough magnifying glass....Its not the theory behind how the chips that got me held up...It's being able to see and solder the darn things. Are there any tips and tricks on doing these ?


Hoot mentioned .100 center pin strips, If I walk into radio shack and ask for those will I get goofy looks ? :D

[Hoot]

I am fortunate to have access to a 7-30x zoom stereo microscope. No way I could make my modules without it. My eyes are older than most of you and they need all the help they can get. :p

Hoot

[Sadow]

cmon guys, these are the bomb :D

i can see myself ordering about 2 of these personally, and no doubt could get alot more if i can team up with more australians to cut down on shipping.!

are there any rpm monitoring chips that could do the same thing for rpm of fans aswell ?

ie send it through the smbus into MBM!?

[Hoot]

Actually, Maxim has several chips out that both allow you to monitor the thermal diode and control the fan. In one of the chips, when the thermal diode sensed temperature hits a programmed point, it switches on a fan. In another chip of theirs, the fan speed is continuously varied as a function of the thermal diode sensed temperature. They have many nice solutions out there. Where we, the consumers are suffering, is the availability of different programs to read the thermal diode and program thresholds on the Maxim ICs via the SMBus. The modules I make use the Maxim IC which has a pin on it to switch either a fan on, or force a fast shutdown, but I can't program in the trip threshold because there is no readily available program to do so and I don't feel like writing one.

Hoot

[VotTak]

So, how to get this stuff?

[Hoot]

Which "stuff"?

You can order Maxim ICs from their on-line store. If you want a finished module, ready to connect to the PC, then you check the Cooling Parts section of the Classifieds here. If you do not have access to the Classifieds, then contact someone who makes them "hint-hint".

Hoot

[VotTak]

I do not have an access to Classifieds, so I believe the only solution for me is to go for "unfinished" module. I was trying to look for that at "Maxim IC" but could not find it. Would somebody give me a link or at least the exact name to look for on their site?
Thnx

[VotTak]

Originally posted by Hoot
Actually, Maxim has several chips out that both allow you to monitor the thermal diode and control the fan. In one of the chips, when the thermal diode sensed temperature hits a programmed point, it switches on a fan. In another chip of theirs, the fan speed is continuously varied as a function of the thermal diode sensed temperature. They have many nice solutions out there. Where we, the consumers are suffering, is the availability of different programs to read the thermal diode and program thresholds on the Maxim ICs via the SMBus. The modules I make use the Maxim IC which has a pin on it to switch either a fan on, or force a fast shutdown, but I can't program in the trip threshold because there is no readily available program to do so and I don't feel like writing one.

Hoot
What need to be programmed? Does that require "regular" programming skills? Is something like C/C++ enough?
Or you are talking about hardware programming?

[X2sandman]

I would like one of these but i have a soyo dragon + w/o SMbus connecter so is there any way that deosn't require me putting my board in danger of being ruined (soldering) that i can have somthing to this effect connected?

-Andrew

[Sadow]

how does one get access to the classifieds ?

[VotTak]

Post 100 messages

[Sadow]

So are these things going ahead?

[Sadow]

where to buy the max1668 chips?

i would like to buy 4 of these chips but cannot find a place in australia that sells them.

does anyone know a place in AUS that sells them, or a place that will ship them to AUS ?

[Hoot]

I apologize for not paying attention to this thread. Once a thread scrolls out of sight, I tend to forget about them. As I said a few posts ago, Maxim has an on-line store for ordering their ICs. I imagine they will ship to anywhere you are willing to pay them to ship to. Try here (https://shop.maxim-ic.com/cgi-bin/maxim.storefront)

I've been selling my plug-in modules as fast as I can make them, but I have only seen a few posts about how they worked out for the people who got them.

Hoot

[Sadow]

well maxim want $50USD shipping

for 4 chips thats not gonna work.

would you be able to sell me some bare chips hoot?

i need them within 5 weeks as i am doing my major university project using these chips, and many others.

but without these chips it basically means i have to scrap my ideas and start again.

[Hoot]

The lead time on the MAX1668 is currently 16 weeks! Better find a different chip for your project. Do you need that many remote channels? All I have is 6657 chips which are only 1 remote channel.

Hoot

[Sadow]

can you use more than 1 6657's on the same smbus?

like the 1668?

[Hoot]

I don't think they have a "Chip Select" pin, nor do I know if they are capable of being assigned unique addresses. Sorry, not what I was looking for when I set down to design a way for people to access the thermal diode on their Athlon XPs.

Hoot

[Sadow]

ok, thanks for your help anyway hoot.

looks like the australian importer is Arrow Electronics, i will give them a ring and see what chips they have in stock, it seems there is about 8 different max chips i can use for the same purpose.

[Sadow]

ok

It looks like the australian distributor hasnt got any of these in stock.

So, If anyone knows a place they could purchase any of the following chips, Could you please contact me :)

max1668
max1805
max1618
max1617

prefer the first one but any of these chips will do.