Unknown temperature sensor IC - Page 1
Forum section: electronics / repair

author: fzabkar
author_rank: Super Contributor
timestamp: April 16, 2023, 07:24:15 pm
content: Could someone please identify the temperature sensor IC in this thread? The markings are 2B0 + ACW + 6XD. "2B0" (zero) could be "2BO" (oh). "6" is probably the year of manufacture.https://forum.hddguru.com/viewtopic.php?p=303318#p303318https://forum.hddguru.com/download/file.php?id=23710&mode=view(photo)https://forum.hddguru.com/download/file.php?id=23711(possible pinout)

author: Swake
author_rank: Frequent Contributor
timestamp: April 19, 2023, 03:05:11 pm
content: It is written above the picture of one of the links. Mcp9844

author: fzabkar
author_rank: Super Contributor
timestamp: April 19, 2023, 04:42:45 pm
content: Quote from: Swake on April 19, 2023, 03:05:11 pmNo, that's a similar part.

author: jwet
author_rank: Frequent Contributor
timestamp: April 19, 2023, 06:12:16 pm
content: This was my morning puzzle today and I failed. I got on DK and browsed about 50 data sheets for that top marking format- no luck. Its obviously one of very many I2C/SMBUS Temp Sensors similar to the LM75 and in the standard pinout. The pins on the top are 1-4, with 1-3 being address inputs, and 4 being a ground. Pin 8 is Vcc and you've marked SDA, SCL and event in yellow. That top mark format doesn't match anyone's that I could find. Its also very possible that its a customer special of some kind. What kind of board did it come off of? There were only a few variants of these until they started putting them on DIMM modules under some JEDEC standard- then they went wild- MFG's tried to stuff read only data into them and created a mess. HDD guys did this too and really proliferated them. There was a thread about using them to "lock" HDD's. I've exhausted DigiKey- you might try an Asian Source with a decent search feature like LCSC? Get a beverage and some cookies, Good luck.

author: fzabkar
author_rank: Super Contributor
timestamp: April 19, 2023, 06:20:13 pm
content: The sensor is found on many models of Samsung SSDs.Here is a Samsung enterprise SSD with several temperature sensors. Coincidentally, both sensors are present.https://images.anandtech.com/doci/15491/IMGP8776.jpgThanks to both for your interest and endeavours.BTW, I'm only guessing at the pinout. The I2C and Event pins may be in a different order. They may not even be I2C.

author: jwet
author_rank: Frequent Contributor
timestamp: April 20, 2023, 02:05:22 pm
content: I'm pretty sure you're correct on the pinouts- this goes back a long way. The only funky thing about some these chips is if they're offered in multiple package, because some packages put the die in upside down, you can get mirror imaged pinouts. since they going to use the same die. If there is only one package, they get the right pinout. Its a bit like SOT transistors.

author: fzabkar
author_rank: Super Contributor
timestamp: April 20, 2023, 09:45:16 pm
content: Here is an interesting resource:http://www.softnology.biz/tips_dfnchips.htmlThe chip has some aspects of Atmel's marking code, and some aspects of IDT's markings.Could it be a TSE2002G?https://www.renesas.com/us/en/document/dst/tse2002gb2a1-data-sheet"4B2" is the marking code for a TSE2004G with a voltage range of 2.3V to 3.6V. (The "2" denotes the voltage.)Here is the datasheet for the TSE3000G:https://www.renesas.com/us/en/document/dst/ts3000gb0a0-datasheetIn this case a "0" denotes a voltage range of 1.7V to 1.9V.Therefore, I wonder if "2B0" is a 1.8V version of the TSE2002G.