TMDX654IDKEVM: Quick question about pin AB8

Michael

Part Number: TMDX654IDKEVM

Hello!

I was looking at the schematic and noticed that, on page 12, pin AB8 (VDDA_LDO_WKUP) appears to be shorted to ground through R798 (whose resistance is 0 Ohms).

What's the purpose of this?

Thanks,

Michael

over 3 years ago

0 Kallikuppa Sreenivasa over 3 years ago

TI__Guru**** 193289 points

Hello Micheal,

Thank you for the Query.

The pin AB8 (VDDA_LDO_WKUP) is WKUP LDO analog power supply.

Please refer to below section in the datasheet

9.2.8 External Capacitors
Figure 9-6 shows an example of the external decoupling capacitor connections.

Regards,

Sreenivasa

0 Michael over 3 years ago in reply to Kallikuppa Sreenivasa

Intellectual 255 points

Thank you for your reply.
I see that the pin is WKUP_LDO analog power supply, but what is the purpose of R798 shorting it to ground?

Thanks,
Michael

+1 Kallikuppa Sreenivasa over 3 years ago in reply to Michael

TI__Guru**** 193289 points

Hello Micheal,

Thank you for the input.

The VDDA_WKUP_LDO in the EVM is s single node meaning not connected. The LDO supply is now 0V meaning not used.

Regards,

Sreenivasa

0 Michael over 3 years ago in reply to Kallikuppa Sreenivasa

Intellectual 255 points

Ah, okay I understand now. Thank you!

0 Kallikuppa Sreenivasa over 3 years ago in reply to Michael

TI__Guru**** 193289 points

Hello Micheal,

Ok, have a great day.

Regards,

Sreenivasa

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TMDX654IDKEVM: Quick question about pin AB8