TPS65987D: delay for I2C

Eriks Austrums

Part Number: TPS65987D

Hello TI,

we have made a test board with TPS65987D and use it as a MASTER with I2C3 to configure a redriver SLAVE.

The problem is that the redriver is powerd on after TPS closes PP_HV1 switch. In this case when we send for example cable orientation even , the redriver is not booted yet and ready to accept I2C communication.

1) Is there a way to delay I2C3 communication after event is triggered ?

2) I can see that there is a IRQ signal pin for I2C3 , can that be used to control communication from master?

Regards,

Eriks

over 5 years ago

0 Adam Mc Gaffin over 5 years ago

TI__Mastermind 30000 points

I've assigned this issue to the relevant expert who will get back to you shortly

0 Prajith Cheerakkoda over 5 years ago in reply to Adam Mc Gaffin

TI__Expert 8750 points

Hi Eriks,

May I know the end application of your project? Is this a Notebook project?

Also, please let me know if you have an EC in this design.

Thansk
Prajih

0 Eriks Austrums over 5 years ago in reply to Prajith Cheerakkoda

Intellectual 675 points

Hello Prajith,

The application doesn't really matter, the question is about is it possible to control/delay the I2C master communication after the event is triggered.

The design doesn't use an EC , we use TPS65987D for its I2C master capabilities , to program redriver .

The only problem is that it looks like its not meant to be used in dead battery mode.

For example, I2C master event "Cable Attach CC_1 PD" triggers way before the redriver has booted and rejects the I2C data sent .

Because of this, we lose the capability to set the cable orientation for our redriver.

Any ideas how to overcome this problem ?

Regards,

Eriks

0 Prajith Cheerakkoda over 5 years ago in reply to Eriks Austrums

TI__Expert 8750 points

Hello,

No, its not possible to delay I2C messages to the redriver. One method to overcome this problem is by powering re-driver directly from Vbus using a dcdc regulator.

Thanks
Prajith

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TPS65987D: delay for I2C