topic Re: TSENS MPC5675K in MPC5xxx

TSENS MPC5675K

wittkop — Tue, 18 Oct 2016 22:31:37 GMT

We have two date codes of MPC5675K devices. Date code 1516 returns a temperature which is representative of other temperature sensors on the card and other assemblies in our unit. Date code 1352 returns a temperature which is roughly 17 degrees higher than the other sensors under the same conditions and running the same software. Was something changed to the devices or calibration constants between the two date codes?

Re: TSENS MPC5675K

davidtosenovjan — Wed, 19 Oct 2016 07:16:16 GMT

Could you read TSENS calibration constants on both devices and send it to us? Thanks

Re: TSENS MPC5675K

wittkop — Wed, 19 Oct 2016 15:52:37 GMT

We have multiple devices of both date codes. Here are the constants from a sample of each date.

Date Code 1352

P1 0xA99

P2 0x5ED

C1 0x5D6

C2 0x894

Date Code 1516

P1 0xAFB

P2 0x645

C1 0x59E

C2 0x863

Re: TSENS MPC5675K

davidtosenovjan — Fri, 21 Oct 2016 07:46:38 GMT

Can you share with me the full device part numbers of the devices, please? Based on this we can found which changes was done there.

Are you using equations from latest reference manual? I was told there were some changes in the past in production as well as in equations in RM. The latest device is more accurate.

Re: TSENS MPC5675K

wittkop — Fri, 21 Oct 2016 12:55:10 GMT

The full part number is SPC5675KFF0MMS2R.

The equations we are using are from reference manual "MPC5675K Microcontroller Reference Manual, Rev 10".

Thank you,

Tom

Re: TSENS MPC5675K

davidtosenovjan — Fri, 21 Oct 2016 13:00:54 GMT

Just for sure - both device has the same part number, they only differ in date code. Is it so?

Re: TSENS MPC5675K

wittkop — Fri, 21 Oct 2016 13:28:14 GMT

I believe so. I have the question to our purchasing department to be completely sure.

Tom

Re: TSENS MPC5675K

wittkop — Thu, 27 Oct 2016 14:19:14 GMT

Have you received any information about changes to the TSENS?

Re: TSENS MPC5675K

davidtosenovjan — Mon, 31 Oct 2016 18:12:23 GMT

I would need from your side all numbers and letters printed on both packages.

Without precise device identification I will not be able to find out anything.

Re: TSENS MPC5675K

wittkop — Tue, 01 Nov 2016 20:26:41 GMT

Here are pictures of each device

Re: TSENS MPC5675K

wittkop — Tue, 08 Nov 2016 13:59:28 GMT

Have you received any information about the TSENS issue?

Re: TSENS MPC5675K

davidtosenovjan — Fri, 11 Nov 2016 12:25:01 GMT

Hi, finally I have got some information -

Devices are using different method how calibration constants P1/P2/C1/C2 are received in factory.

SPC5675KFMMS2 0N72D CTJR1516A is using new method.

SPC5675KFMMS2 0N72D CTKN1352A is using old method.

I will not publish more details here, moreover I am waiting for further clarification to exactly know from which datecode the change is being applied. Note that this is a difference in test and calibration software during manufacturing, device silicon is equal.

However the accuracy of the temperature sensor is +-10 degrees so from this point of view the device are in line with the DS because the maximum difference between two devices can be up 20 degrees.

Re: TSENS MPC5675K

davidtosenovjan — Mon, 14 Nov 2016 12:12:33 GMT

I have just been informed new method is applied since date code 1451.

Re: TSENS MPC5675K

NicolasH1 — Tue, 03 Dec 2024 16:47:32 GMT

Hi David,
i am facing the same issue.
We have a device with those info:
SPC5675KFVMS2 0N72D CTKL1424D,
and another:
SPC5675KFVMS2 0N72D CFZ2108B.
For both we use the formula described in chapter 53.6.2 of reference manual rev 10.

A = PxC2 – P2Cx

B = CxP1 – PxC1

T = -40 + 185*(A/(A+B))
For the 1st one, we have a realistic temperature, not for the 2nd one, which seems to require the "new formula".
Would it be possible to have the formula for the devices whose date codes are higher than 1451?

How is it possible to read the info indicating which formula has to be applied?

Thanks in advance.