DAC8234: HW Reset

Yuta Nishie

Part Number: DAC8234

Hi,

I found the following thread:

https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/476852/power-sequencing-of-dac8234?tisearch=e2e-sitesearch&keymatch=DAC8234#

Am I correct in understanding that if the power sequence is not met, the HW reset by/RST pin will be disabled because the device is not working properly?

Best Regards,

Nishie

over 1 year ago

0 Paul_Frost over 1 year ago

TI__Guru 53633 points

I will respond after the US holiday weekend.

0 Yuta Nishie over 1 year ago in reply to Paul_Frost

Genius 4135 points

Hi Paul-san,

OK.

I look forward to hearing from you.

Best Regards,

Nishie

+1 Paul_Frost over 1 year ago in reply to Yuta Nishie

TI__Guru 53633 points

Hi Nishie-san,

The issue here is that if the supply ramp is not sequenced correctly, the internal memory can be mis-acquired. So it is not that the RESET pin does not work, but it does not trigger a re-acquisition of the memory. It is necessary to control the supply sequence in this case.

Thanks,
Paul

0 Yuta Nishie over 1 year ago in reply to Paul_Frost

Genius 4135 points

Hi Paul-san,

Thank you for your reply.

Let me ask you an additional question.

1. Is the perception of memory as "User Calibration: Zero Register 0 and Gain Register 0" correct?
2. Is the perception that User Calibration can not be triggered if the power sequence is incorrect?

Best Regards,

Nishie

+1 Paul_Frost over 1 year ago in reply to Yuta Nishie

TI__Guru 53633 points

The zero and gain registers have a value that is programmed in the factory, but if the memory is not acquired correctly, these could be incorrect. This would mean that the gain and offset values could be incorrect causing the device to misfunction. Supply sequencing is essential in this case.

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DAC8234: HW Reset