DAC70501: Bit 9 of the config register of DAC70501Z and DAC70502 is set after RESET, why?

Ulrich Pahl1

Part Number: DAC70501
Other Parts Discussed in Thread: DAC70502

Hi at all,

I am implementing now the DAC70501Z and DAC70502 devices in my software project. Reading the config register of both devices after reset deliver a 0x0200, that means bit 9 is set. This value is not described in the data sheets of both devices.

Is this correct and what does this bit means?

Then I have a hint for the description of the data register, command 8 and 9. On page 29 you find the hint that the data is left aligned. Please refer the screenshoot.

On Page 34 there is no hint on the left alignment of the data. This nice hint could save time and questions.

Kind regards,

Ulrich

over 3 years ago

0 Paul_Frost over 3 years ago

TI__Guru 53333 points

Hi Ulrich,

I am looking for our design to comment on the configuration register bit. The digital designer is out-of-office for a few more days so I will confirm with him on monday.

The left-alignment is noted in the register map, as you have highlighted. The DAC-DATA description also shows 2 and 4 bit fillers on the data, but I agree, some more clarity is likely needed.

Thanks,

Paul

0 Akhilesh K over 3 years ago in reply to Paul_Frost

TI__Mastermind 18926 points

Hi,

I checked this with my digital design team, bit 9 should be set so what you are reading as 0x0200 is correct. We will update the PDS to reflect this change.

Sorry for the inconvenience.

Regards,

0 Ulrich Pahl1 over 3 years ago in reply to Akhilesh K

Prodigy 190 points

Hi,

Thank you for that information, but what does this bit 9 means?

Regards

Ulrich

0 Akhilesh K over 3 years ago in reply to Ulrich Pahl1

TI__Mastermind 18926 points

Hi,

This bit is reserved by design. From user point of view, there is nothing to be worried about.

Regards,

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DAC70501: Bit 9 of the config register of DAC70501Z and DAC70502 is set after RESET, why?