TPA3221: Pull-up Resistor for AVDD

Sadanori Kato

Guru 36540 points

Other Parts Discussed in Thread: TPA3221

Hi,

Could you please tell me whether the pull-up resistor can be connected to AVDD with 1kohm ~ 10kohm or not ?

Best regards,
Kato

over 8 years ago

0 Adam Sidelsky over 8 years ago

TI__Guru 66550 points

Kato-San,

Which pull up resistor?

AVDD in OUTPUT MODE should not be used for external circuitry.

Regards,

-Adam

0 Sadanori Kato over 8 years ago in reply to Adam Sidelsky

Guru 36540 points

Hi Adam-san,

Thank you for your prompt reply.

Please tell me how to connect the pull-up resistor with the internal LDO if using the pull-up resistor in the reset control as below.

Best regards,
Kato

0 Sadanori Kato over 8 years ago in reply to Sadanori Kato

Guru 36540 points

Hi Adam-san,

I have an additional question.

Could you please tell me how to handle the /RESET pin in the internal LDO mode if using TPA3221 with the pin strapped mode ?

Best regards,
Kato

0 Adam Sidelsky over 8 years ago in reply to Sadanori Kato

TI__Guru 66550 points

Kato,

For a customer (non-EVM) board, the TPS3802K33 device is not needed so therefore R32 is not needed. Are you or a customer designing a new board?

In general the LDO output should only be used for small pull ups for the device itself (HEAD mode pin, etc.).

Regards,

-Adam

0 Adam Sidelsky over 8 years ago in reply to Sadanori Kato

TI__Guru 66550 points

I don't follow, what is Pin Strapped Mode?

I think you may be asking how to bring RESET high if the internal LDO is used. In this case you will need an external 5V or 3.3V low current supply for bringing the device out of RESET. This behavior was chosen because almost all of the customers using this device will have 5V or 3.3V available from an on board LDO, Bluetooth chip, wireless chip, or LED supply.

Regards,

-Adam

0 Sadanori Kato over 8 years ago in reply to Adam Sidelsky

Guru 36540 points

Hi Adam-san,

Thank you for your response.

I will recommend our customer to control /RESET and /CMUTE by using uC or the reset controller.

Best regards,
Kato

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TPA3221: Pull-up Resistor for AVDD