TPS65987DDK: I2C Address Selection

Jason Ciou

Expert 3600 points

Part Number: TPS65987DDK

Hi team,

I would like to know why I2C2 address can't match the datasheet.

If the I2C1 address is 0x23, I think I2C2 address should be 0x48, but the GUI show 0x38. May I know why?

over 3 years ago

0 Christodulos Tsongas over 3 years ago

TI__Genius 12985 points

Jason,

I2C2 address can be overridden in Global System Config (0x27)

Thanks,

Chris

0 Jason Ciou over 3 years ago in reply to Christodulos Tsongas

TI__Expert 3600 points

Hi Chris,

Where I can overrideden in 0x27. I haven't seen that.

Jason

0 Christodulos Tsongas over 3 years ago in reply to Jason Ciou

TI__Genius 12985 points

Jason,

Sorry the new 6.3.3 GUI has a separate register for I2C Address Override mapping (0x2B)

0 Jason Ciou over 3 years ago in reply to Christodulos Tsongas

TI__Expert 3600 points

Hi Chris,

I don't see that in Dell GUI DELLONLY Application Customization 6.6.27

Could you help to check?

btw, why the GUI always show 0x38?

Jason

0 Christodulos Tsongas over 3 years ago in reply to Jason Ciou

TI__Genius 12985 points

I do see it in the 6.6.27 GUI

Please attach the PJT so I can open it in the 6.6.27 GUI.

0 Jason Ciou over 3 years ago in reply to Christodulos Tsongas

TI__Expert 3600 points

Hi Chris,

They need to modify it like below, right?

Please see attached file, if they don't override the I2C2 address, is it ok with that?

20220412_U4924DW_987dk_6.6.27_F907_14_10.pjt

Jason

0 Christodulos Tsongas over 3 years ago in reply to Jason Ciou

TI__Genius 12985 points

Correct. And it is ok.

0 Jason Ciou over 3 years ago in reply to Christodulos Tsongas

TI__Expert 3600 points

Hi Chris,

One question, they use I2C2 in their design, I don't use 0x2B to override the I2C2 address, but I don't see anything wrong in their design, may I know why?

Jason

0 Christodulos Tsongas over 3 years ago in reply to Jason Ciou

TI__Genius 12985 points

The GUI could be inaccurate in the value displayed. Best way to test is to read from 0x4F on I2C2 and see if it responds.

0 Christodulos Tsongas over 3 years ago in reply to Christodulos Tsongas

TI__Genius 12985 points

Just confirmed this is just a GUI issue. The I2C2 address does not update based on I2C_ADDR set.

0 Jason Ciou over 3 years ago in reply to Christodulos Tsongas

TI__Expert 3600 points

Hi Chris,

So we don't need to override the I2C2 address on 0x2B, right?

Jason

+1 Christodulos Tsongas over 3 years ago in reply to Jason Ciou

TI__Genius 12985 points

Correct.

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TPS65987DDK: I2C Address Selection