LM95233: About Diode model select

Hello Hiroshi,

LM95233 is a drop-in replacement for LM95213. The main difference difference that you should be aware of is the diode model select register. The diode mode selects allows you to connect to either a 65 nm intel processor or a MMBT3904 transistor.

1) As mentioned, 0x30 is the only extra register in MMBT3904. No software changes are needed if you do not want to take advantage of this register. The default setting is to set Remote 1 to a 65 nm Intel processor and Remote 2 to a MMBT3904. (default is 0x02)

2) Yes you are correct that remote 2 is disabled by default. I'm currently in the process of ordering parts to test this functionality for you. I will reply back to this post when I get an answer.

3) The ThuTherm attempts to remove error in your specific application. The accuracy spec that we measure in the datasheet is measured under ideal conditions and that will not change between the datasheets. Its application specific.

4) For better accuracy performance we recommend MMBT3904 or Intel. Can you clarify what you mean by "same as the LM95213"?

Best Regards,

Meredith McKean

Hi Meredith san,

Thank you for your support.
We will confirm and inform you regarding 4).

Best Regards,
Hiroshi

Hi Meredith san,

I have confirmed 4).　Below are customer comments.

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Currently, temperature sensors are used with the following connections.
LM95213
Remote 1: Connect to MMBT3904
Remote 2: Connect to CPU or FPGA from a manufacturer other than Intel

On the other hand, I would like to check whether the temperature measurement accuracy is the same as the LM95213 even if it is replaced with the LM95233.

We believe that the default value of 0x02 will be set for the Diode Model Select 0x30 setting as we have not considered any changes to our software. 0x02=0b00000010, so
Only Remote 1 has TruTherm enabled, Remote 2 has it disabled.
Disabled Remote 2 connects to CPUs and FPGAs from manufacturers other than Intel. This means that it has the same temperature measurement accuracy (Temperature Error Using Remote Diode) as the LM95213.

And since MMBT3904 is connected to Remote 1 which is enabled, this also has Temperature Error Using Remote Diode in the datasheet.
According to my understanding, the accuracy in the case of MMBT3904 is the same as that of LM95213.

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Is the customer's understanding correct?
In addition to the above Enable/Disable status,
The D/S specs themselves look pretty much the same.

Best regards,

Hiroshi

Hello Hiroshi,

Thank you for the clarification. 

To clarify, you are wanting more information about the performance of the part when connected to the opposite to the default setting without changing the software. We can only guarantee performance when following the recommended conditions in the datasheet. Have you suggested flipping the connections between the remote 1 and remote 2? LM95233 is a drop-in replacement for LM95213 that adds the TruTherm feature. Yes TI specs the accuracy of LM95213 and LM95233 the same. The TruTherm feature improves temperature accuracy of embedded junctions within their system. It has no benefit for discrete junctions.

Once I get the parts, I will inform you of my findings.

Best Regards,

Meredith McKean

Hello Meredith,

Thank you for your support.

>Have you suggested flipping the connections between the remote 1 and remote 2?
Sorry, Since the customer is still considering a replacement, it seems difficult to test it right away.

>Once I get the parts, I will inform you of my findings.
How is the situation after that? We will wait for the results.

Best regards,

Hiroshi

Hello Hiroshi,

There has been a delay in shipping the parts.

Best Regards,

Meredith McKean

Hello Hiroshi,

Thank you for the PowerPoint Slide. I will take this over email.

Best Regards,

Meredith McKean