AM3352: Schematics checklist ADC update

Kummi

Part Number: AM3352

Hi,

I think the schmatics checklist need to be corrected with respect to unused ADC.

processors.wiki.ti.com/.../AM335x_Schematic_Checklist
If ADC is not used...
Connect all TSC_ADC terminals (VREFP, VREFN, AIN[7:0], VDDA_ADC, and VSSA_ADC) to same ground as all VSS terminals.

Whereas the errata advisory says...

Advisory 1.0.32:
• TSC_ADC AIN terminals not used:
The preferred option is to have each unused AIN terminal connected to VSSA_ADC
through a 500-Ω resistor. Another option would be to leave the unused AIN terminals
open-circuit without any PCB traces connected to these terminals

Best Regards
Kummi

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

Hi,

Your observation is not correct. The Errata advisory discusses the situation where the VDDA_ADC and VSSA_ADC are present, while the schematic checklist discusses the situation where the ADC is completely unpowered.

0 Kummi over 8 years ago in reply to Biser Gatchev-XID

Mastermind 6220 points

Hi Biser,

Thank you for the confirmation.

So the errata applies only if we have few unused pins
and if we don't use ADC at all, then we can connect all the ADC terminals to GND?

Best Regards
kummi

0 Biser Gatchev-XID over 8 years ago in reply to Kummi

TI__Guru**** 393215 points

Correct.

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AM3352: Schematics checklist ADC update