TMS320F280041: Isolate

Ray Vincent Aranzaso

Part Number: TMS320F280041

Hi,

Good Day.

This is related to my other post, please see below the link for your reference.

For on-board communications, is the same with I2C, SPI, etc.?

Let me explain: I have a microcontroller that communicates with a differential ADS, via SPI bus.

ADS measures the differential signal coming from a stress cell located about one / two meters from the board.

Does putting TVS diodes on the + 5V, Stress +, Stress- pins allow me to prevent any ESDs, EFTs and avoid isolating the SPI bus?

Putting a TVS diode on the GND pin of the stress cell, the customer think is really useless.

He always finds it written as "separate GNDD planes from GNDA ones" but so far he has not been able to see examples without isolation.

The chip he want to use is ADS130E08IPAG and TMS320F28004x-100pins.

Please advise. Thank you very much.

Best Regards,

Ray Vincent

0 Luke Jones over 3 years ago

Hello Ray,

We are finding the appropriate expert to answer your question, thank you for your patience.

Luke

0 Ray Vincent Aranzaso over 3 years ago in reply to Luke Jones

Hi Luke,

Good Day. I would like to follow up on the customer's query. Thank you very much.

Best Regards,

Ray Vincent

0 Manoj Santha Mohan over 3 years ago in reply to Ray Vincent Aranzaso

Vincent,

We are looking into this request. Please give us couple of business days to get back with you.

Regards,

Manoj

0 Manoj Santha Mohan over 3 years ago

Vincent,

This is the latest response from isolator team.

You don’t need a digital isolator to separate the two grounds.
Please refer to this link for more details on how to separate analog and digital grounds: https://electronics.stackexchange.com/questions/185306/analog-power-ground-planes-doubts/185320#185320
Please reach out to the data converters team for the best answer and useful resources

Regards,

Manoj

C2000 microcontrollers forum