TMDSCNCD263-PMIC: TPS650332Q1 fault development

tps650332-q1 datasheet.pdf

Hi there,

  The OPN "TPS65033200-Q1" has I2C_CRC enabled; all registers operations need to have the CRC byte inserted as described in its datasheet. 

  Please check this FAQ for "How to make CRC for TPS650332-Q1 I2C communication".

Thanks!

Phil

At present, the value of the chip register 0h (PID) is 0xda, and the value of the register 1h (RID) is 0x59 by the IIC tool or program.
The Reset values indicated in the manual (tps650332-q1 datasheet) are (PID) 0xd0 and (RID) 0x09 respectively.
But write can't write data.
The read value is inconsistent with the manual. We need to confirm whether the data we read is correct.

Hi   Phil,

         Thank you very much for your answer.
         Based on your conclusions, we can confirm that the values we read are correct.
There are still a few questions that need to be answered.
         Problem 1: However, the current write to the Pmic register cannot be written at this time.
Are there any corresponding rules or certain external conditions for the chip write operation?
         Problem 2: For Pmic fault detection, the fault status bit of the register is read as the judgment basis.
Are there appropriate fault injection conditions that can cause changes in register fault status bits?
There is currently no corresponding fault injection method in the security manual documentation.
Hope to provide a solution.

Hi Thundersoft,

 Answer 1: Please insert a CRC byte for I2C communication since this variant has I2C CRC enabled. 

Answer 2:  Please follow this FAQ to get security manual documentation. 

Thanks!

Phil

hi

     Thank you very much for your answer.

     I would like to ask I2C communication to insert CRC bytes, can this operation give an example of assigning a value to a register?
For example, in the figure above, register write operation, how to enter parameters, how to insert CRC, whether there is a register configuration can unlock the register write.
Is there a detailed list of relevant registers?

Hi, Phil.

Answer 2:  Please follow this FAQ to get security manual documentation. 

We have got the safety manual throuth the below case. But we cannot know how to reject the fault to verify that the safety mechanism is well working. Is there any guide for this ?

e2e.ti.com/.../tps650332-q1-functional-safety-manual

Hi Yuting,

  Please find attached as a reference for the how.

Buck2_OV_UV_Test.pdf

Thanks!

Phil

Hi， Phil.

It seems that this reference descripes a methods using HW. Is there a SW methods to reject the fault?

For example: Using a script to write the fault value to the fault register, and the status register will auto-change to fault status according with the fault register. SW will check the status register to confirm if there is the fault.

Thanks.

Hi Yuting,

  We don't have SW methods to reject the fault.

Thanks!

Phil

Hi, Phil.

Sorry for my mistake.  I mean inject the fault, but not " reject".  Hope it didnot make you confuse and mis-understand.