TMS320F28377D-Q1: Thermal resistance of 176 pin HLQFP packing [TMS320F28377DPTPQ]

Hi Cris,

Thank you very much for using the E2E forums. The thermal characteristics can be found in the TMS320F2837xD datasheet in the Thermal Resistance Characteristics section. For your convenience, I have attached the section relevant for your package (176-pin PTP package).

I am not too familiar with your second question. We do not disclose transistor counts publicly, and all publicly available information can be found in the TMS320F2837xD datasheet I linked above. There are various functional safety enablers available on the TI website to assist you in this regard. Please let me know if you have any further questions.

Regards,

Peter

Hi Peter,

Thank you very much.

THERMAL RESISTANCE:
Originally I had the datasheet SPRS880O – DECEMBER 2013 without this information, but later I found it on the  – REVISED FEBRUARY 2021 edition.
This will be fine. Thanks again.

INTEGRATION SCALE/DEGREE OF INTEGRATION (related to LSI, MSI, SSI)
We need to know this in order to determine the Reference Failure Rate, please refer to table 2 of SN 29 500  



I have three devices in our design, and have the same question to each of them (opened one case for each):

1) MAIN Controller TMS320F28377DPTPQ
2) BMS IC bq76PL536A-Q1
3) Current and Power Monitor IC INA226

In case TI will not be able to clarify it, I will use as follows:

- assuming CMOS technology for all three

1) 10M-100M Gates / >50M-500M Transistors, Lambda_ref= 150 FIT, ϑ_vj,1 = 90 °C
2) 100k-1M Gates / >500k-5M Transistors, Lambda_ref= 80 FIT, ϑ_vj,1 = 90 °C
3) 1k-10k Gates / >5k-50k Transistors, Lambda_ref= 30 FIT, ϑ_vj,1 = 60 °C

I am pleased of TI's effort of product description and support, I think it is a leading company. Moreover I hope that TI can support us here and also other clients by making the product description even more better (scientific appropriate).

Kind regards,
Cris
 

PS: I also found somewhere FS information to 2):stating a 0,2 FIT value but I am not sure about the background of this number. Until clarification, I am hesitate to use it. (I read the test conditions, but cannot assume a correct value for functional safety assessment.) If there is an available expert who understand the proper way of MTTF calculation, I would be happy to have a discussion/experience exchange with him.

 

Hi Peter,

This is from LM2903 Datasheet, so the transistor count seems to be not confidential. Why it should be?
Also I am not interested in the exact number, but just the range.(see below screen shot from SN 29500 for Microprocessors,, DSP).
Pls be honest, do you know the number?

Kind regards,
Cris

Hi Cris, 

Thanks for reaching back out. I've gone ahead and reached out to someone more familiar with functional safety, so please expect a response from them. 

Regards,

Peter

Cris,

I wanted to reply back based on Peter's last response to not leave this open ended.  Due to the timing of the question we got caught in the holiday time frame and certain functions inside TI weren't available to comment.

Based on the feedback we've been given transistor count is not information that we are able to share publicly.  

I would refer to this whitepaper https://www.ti.com/lit/swab014 which includes the automotive functional safety collateral we have for the F2837x.  There may be some additional data related to the assumed fail rates/models that can be applied as referenced in this document.

Best,

Matthew

Hi Matthew,

Happy new Year & Thanks for the comment.

The link you sent is marketing Schnickschnack, and quite useless if it comes to FS.
If you are expert of Functional Safety you may understand that SIL levels are related to a SYSTEM with SPECIFIC SAFETY FUNCTION, with is never the case for a single component.

In order to define the SIL or any other FS level, you need therefore:

1. Safety Function

2. analyze the System

For 2. a FMEA and a reliability calculation are required. For the latter the MTTF and the failure distribution need to be known for every single component.
Unfortunately, the components makers are not able to give appropriate information - a fact that need to change in future - then the FS engineer is forced to substitute the missing info by own estimation, based on the data bases established by smart companies, understanding this problem, like Siemens.

To do that approximation a little more likely to the reality, the essential basic components information, as the INTEGRATION SCALE are mandatory necessary!!!

THEN I AM VERY SURPRISED THAT THE LEADING MANUFACTURER TEXAS INSTRUMENTS GIVES ME SUCH A BAD AND STUPID ANSWER: "bla, bla, bla...Transistor count not disclosed." 

It appears to me as the lazy American way...get rid of this bloody guy by telling him....

Sorry, but I have no other explanation anymore, and wasted plenty of time with someone do not want cooperate at all.

Regards,

Cris