TLV320AIC3105: Reset pin tied to VCC

Colin Adema

Part Number: TLV320AIC3105

Hello,

I want to use the AIC3105 codec for an audio application, it will be connected to a TI DSP. I read in the datasheet that the reset pin should be held low for at least 10ns after the power supplies have turned on, and I was wondering if it was possible to tie the codec reset to VCC and use some sort of RC circuit to delay the voltage rise so it meets specification. I figured that ideally it should be connected to a GPIO for manually resetting the codec, but the few GPIO I have available I was hoping to use for PWM outputs. If my idea doesn't meet the specification, then some design ides and/or a link to a similar thread would be greatly appreciated.

Thank you!

Best,

Colin

over 4 years ago

+1 Aaron Estrada over 4 years ago

TI__Mastermind 22950 points

Hi Colin,

We generally see/recommend that RESET be pulled up and toggled via MCU as you correctly assumed. I can't say for certain if your method on using an RC delay circuit will work but as long as RESET is held low for 10ns after all supplies are fully powered, then I don't see an issue.

I am a little worried that RESET will begin rising before all supplies are stable and this may cause abnormal behavior. It is hard to predict what exactly may happen but it is possible for unwanted behavior to appear. We don't have any other example circuits but I can confirm that I have seen some customers use logic gates on the RESET line to determine when the RESET line is held low.

Regards,
Aaron Estrada

0 Colin Adema over 4 years ago

Prodigy 130 points

Thank you! I'll think about using logic gates in the design. If that doesn't work, I can re-route some pins.

Best,

Colin

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TLV320AIC3105: Reset pin tied to VCC