TPS65988DJ: I2C Interrupt

Baghiya Lakshmi

Part Number: TPS65988DJ

Hi,

I am planning to use the I2C interrupt of I2C1 for detecting a Host device connection.

The interrupt is getting low when a host device is connected but the line is not getting high when the Host is disconnected

over 3 years ago

0 Prajith Cheerakkoda over 3 years ago

TI__Expert 7700 points

Hi Baghiya,

You need to clear the interrupt by writing the registers shown below. You can find the details in Host interface technical reference manual.

Thanks

Prajith

0 Baghiya Lakshmi over 3 years ago in reply to Prajith Cheerakkoda

Intellectual 645 points

Hi Prajith,

So, the interrupt wont get revoked (low to high) when the event is gone???

0 Prajith Cheerakkoda over 3 years ago in reply to Baghiya Lakshmi

TI__Expert 7700 points

Hi Baghiya,

No, I2C master need to clear the interrupt.

Thanks

0 Baghiya Lakshmi over 3 years ago in reply to Prajith Cheerakkoda

Intellectual 645 points

Hi Prajith,

Sometimes, the Interrupt pin is low even in Power on condition.

The only Interrupt mask set if the USB Host present in Port 2.

But it is low even when Port 2 has no connection

I can reproduce the same in EVK too

0 Prajith Cheerakkoda over 3 years ago in reply to Baghiya Lakshmi

TI__Expert 7700 points

Hi Bhaghiya,

Interrupt after power up usually happens if the Ready for patch or patch loaded interrupt is enabled.

You can go to debug mode and find all the active interrupts. If you are seeing any of them enabled, you need to clear it.

Please let me know if you need further help on this.

0 Baghiya Lakshmi over 3 years ago in reply to Prajith Cheerakkoda

Intellectual 645 points

Hi prajith,

I have checked in debug mode too

None of them is enabled.

Yet the line is driven low.

0 Prajith Cheerakkoda over 3 years ago in reply to Baghiya Lakshmi

TI__Expert 7700 points

Hi Bhagiya,

Are you seeing this on DDJ or DDH?

Thanks
Prajith

0 Baghiya Lakshmi over 3 years ago in reply to Prajith Cheerakkoda

Intellectual 645 points

Hi Prajith,

I am using DH only,

Also, please mention what do you mean by clear the interrupt (whether it is in the PD side or processor side)?

0 Prajith Cheerakkoda over 3 years ago in reply to Baghiya Lakshmi

TI__Expert 7700 points

Hi,

Processor has to clear the interrupt event by writing IntClear1 or IntClear2 (0x18/ 0x19). You can find the details in TRM.

Thanks

Prajith

Interface

Interface forum

TPS65988DJ: I2C Interrupt