DS90UB954-Q1: Stopping the output of CMLOUT

Masanori Okano

Part Number: DS90UB954-Q1

Hi Teams,

Please tell me about the CMLOUT output stop on the DS90UB954.

I am assuming that the CMLOUT output is disabled by default and I need to switch the setting to enabled when I want to measure eye aperture.

Question.
If the register setting is the default, is the CMLOUT output enabled?

I would like to know if there is a register to enable/disable the output of CMLOUT.
(Is ADAPTIVE_EQ_BYPASS at address 0xD4 that register?)

Best Regards,

over 2 years ago

+1 Logan Cummins over 2 years ago

TI__Guru 66810 points

Hi Okano-san,

This is outlined in the CML_OUT datasheet section below:

By default CML_OUT is disabled.

Regards,

Logan

0 Masanori Okano over 2 years ago in reply to Logan Cummins

Prodigy 230 points

Hi Logan,

Thank you for your response.
I understand and will close it.

Regards,

Masanori

0 Masanori Okano over 2 years ago in reply to Masanori Okano

Prodigy 230 points

Hi Logan,

I have marked it as closed, but could you please add an additional question?
What would happen if I do a celestial(sky) fault or an earth fault when CML_OUT is disabled?
Since it is disabled, is there any problem with normal operation?
Or will the IC be damaged?

Please let me know because I would like to use it to investigate the failure mode.

Regards,

Masanori

0 Logan Cummins over 2 years ago in reply to Masanori Okano

TI__Guru 66810 points

Hi Masanori,

I don't understand the question. Can you elaborate?

CML doesn't have any impact on devices fault handling capability.

Regards,

Logan

0 Masanori Okano over 2 years ago in reply to Logan Cummins

Prodigy 230 points

Hi Logan,

I am trying to create a Failure Mode and Effect Analysis (FMEA).
In the process, I would like to know how the CMLOUT will behave in case of a celestial(sky) fault or ground fault.
A brownout is when the CMLOUT pin is shorted to the +1.8V power supply.
A ground fault is when the CMLOUT pin is shorted to GND.

Please let me know if this is just reference information.

Regards,
Masanori

0 Logan Cummins over 2 years ago in reply to Masanori Okano

TI__Guru 66810 points

Masanori,

CMLOUT will be disabled and will be inactive, no failure would be expected.

Regards,

Logan

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DS90UB954-Q1: Stopping the output of CMLOUT