Protocol SMBus using i2c with an Launchxl-f28379d

Abed Meguenni

Prodigy 60 points

Other Parts Discussed in Thread: LAUNCHXL-F28379D, BOOSTXL-AFE031-DF1, LAUNCHXL-F280049C, AFE031

Hello,

I try to develop a communication between a PC and a battery written in C.

It should work like that : Battery <-> (SMbus) <-> MCU <-> (PLC)<-> PC

Currently i'm searching some solution and i have found something that should work but i still have questions.

I think that i will use 2 Developments kits : Launchxl-f28379d as my MCU and boostxl-afe031-df1 to use PLC protocol.

I know that Launchxl-f28379d hasn't SMbus protocol but it has i2c pin, and from what i know SMBus is a derivative of i2c .

So my question is : Can i use i2c pin with Launchxl-f28379d to create an SMBus protocol ? Do you think that the kits that i choosed could work or do you have other solution that would be better ? And if you have some exemple for the code or some tips it would be great !

Thank you in advance for your response

over 5 years ago

0 Kevin Allen18 over 5 years ago

TI__Mastermind 45606 points

Hi Abed,

Abed Meguenni said:
Can i use i2c pin with Launchxl-f28379d to create an SMBus protocol ?

I believe the F2837x I2C should be compatible to SMBUS 2.0 spec, but I will confirm. It looks like this is the case with F28004x at least.

e2e.ti.com/.../tms320f280049-can-data-setup-hold-time-smbus-2-0

Abed Meguenni said:
Do you think that the kits that i choosed could work or do you have other solution that would be better ? And if you have some exemple for the code or some tips it would be great !

I don't quite understand how you're planning to use boostxl-afe031-df1 and PLC in your system. Can you provide more details? You could use LAUNCHXL-F280049C which has SW support (B-FSK solution) for boostxl-afe031-df1 as well.

Best,

Kevin

0 Abed Meguenni over 5 years ago in reply to Kevin Allen18

Prodigy 60 points

Hi Kevin,

First thanks for the reply !

In my project i need to retrieve data from a battery that communicate with SMBus protocol. After that i must send the data through AC power line and then extract it with a computer.

So to do it, i need to use Power-Line communication. And i have seen that AFE031 is an integrated power-line communication that can be paired with a C2000 MCU (like the F2837x or the F28004x).

For this purpose, i thought that i could use F2837x as my MCU to retrieve the data from the battery and then send it with an AFE031.

Thanks,

Abed

0 Manoj Santha Mohan over 5 years ago in reply to Abed Meguenni

TI__Guru 55700 points

You should be able to communicate with SMBus devices using I2C. But, I hope you are aware I2C doesn't support PEC. If you really need that feature you can consider moving to F28004x (which contains PMBus). PMBus is much closer to SMBus that I2C.

Regards,

Manoj

0 Kevin Allen18 over 5 years ago in reply to Abed Meguenni

TI__Mastermind 45606 points

Hi Abed,

OK, understand your project better now. Yes, AFE + C2000 can be used for PLC. See the application report below for additional details.

https://www.ti.com/lit/sprac94

Best,

Kevin

0 Abed Meguenni over 5 years ago in reply to Kevin Allen18

Prodigy 60 points

Ok so if i understand :

If i want to use SMBus protocol (V 1.1) i should be able to communicate with I2C. However I2C doesn't support PEC, but i can moove to F28004x which contains PMBus. PMBus is much closer to SMBus and i should be able to use PEC. Furthermore, F28004x can be used with AFE for PLC.

But i dont see any PMBus pins on LAUNCHXL-F280049C ?

Regards,

Abed

+1 Kevin Allen18 over 5 years ago in reply to Abed Meguenni

TI__Mastermind 45606 points

Hi Abed,

You're understanding is correct.

Abed Meguenni said:
But i dont see any PMBus pins on LAUNCHXL-F280049C ?

The LaunchPad pin out diagram does not show all signal MUX options of the F280049C pins. To locate what pins PMBUS signals are on you should refer to the device datasheet or you can use the pinmux tool.

https://www.ti.com/lit/ds/symlink/tms320f280049.pdf

Best,

Kevin

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Protocol SMBus using i2c with an Launchxl-f28379d