PGA411-Q1： PGA411-Q1： pga411 Non working

user5059319

Part Number: PGA411-Q1

I do it according to this circuit. The pga411 doesn't work. I don't know if there is a mistake in the circuit diagram.Rotary encoder v1.0.Sch

over 5 years ago

0 user5059319 over 5 years ago

Prodigy 70 points

Rotary encoder v1.0.pdf

0 Clancy Soehren over 5 years ago in reply to user5059319

TI__Mastermind 23810 points

Thank you for sending the schematic. I will review it.

Does the device start operating when you force FAULTRES low?

0 user5059319 over 5 years ago in reply to Clancy Soehren

Prodigy 70 points

Forced FAULTRES can not work at low ，I found that the Thermal on the back of the chip was not connected，I wonder if this is the reason.

0 Clancy Soehren over 5 years ago in reply to user5059319

TI__Mastermind 23810 points

I have a few notes about your schematic:

- All NC pins should be connected to ground.
- AOUT should be connected to ground.
- C3 should be 100nF (the value wasn't shown on the schematic)

Not connecting the thermal pad could cause an issue.
- What is the voltage on VDD? It should be around 1.8V. If this is below 1.6V, then the device is not even powering up correctly.
- Check the VEXT rail as well. If this is not supplied correctly, the exciter output will be unable to operate, even with FAULTRES low.

0 user5059319 over 5 years ago in reply to Clancy Soehren

Prodigy 70 points

Thank you very much for your advice.

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PGA411-Q1： PGA411-Q1： pga411 Non working