TPS65987D: I2C multi-master

David Mckinney

Part Number: TPS65987D
Other Parts Discussed in Thread: TPS65988

Can you operate 2x TPS65987D on the same I2C master bus going to a MCU? In other words, both TPS65987D have Master I2C outputs connected to the same MCU slave I2C input?

Does the TPS65987D support multi-master? If it doesn't, is there any issue with configuration on a testboard? We are trying to get around using a TPS65988 dual port device on a test board only configuration as we can keep the fw the same on the TPS65987D.

over 5 years ago

0 Prajith Cheerakkoda over 5 years ago

TI__Expert 8730 points

Hi,

87D doesn't support Multi-master.

If it doesn't, is there any issue with configuration on a testboard? We are trying to get around using a TPS65988 dual port device on a test board only configuration as we can keep the fw the same on the TPS65987D.

>>> I did not get you. Please explain.

Why don't you use 88 (Dual port controller) instead of 87?

Thanks
Prajith

0 David Mckinney over 5 years ago in reply to Prajith Cheerakkoda

TI__Expert 6860 points

Thanks, that's what I thought. So the main thing we lose is auto arbitration on the controller side. If we control comm initiation on the bus, say by not allowing simultaneous port plug-ins, we shouldn't have to worry about bus contention. Does that sound correct?

0 Prajith Cheerakkoda over 5 years ago in reply to David Mckinney

TI__Expert 8730 points

Hi David,

Simultaneous port plug-in is a use case. Similarly, you will have to check all other possibilities based on how you are going to use the PD controllers in your project.

Thanks
Prajith

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TPS65987D: I2C multi-master