DS90UB949-Q1: Unused pins

Jejomar Ildefonso

Hi Team,

In our customer's DS90UB949-Q1 design, he does not intend to use the register-only GPIO/I2S pins (33-36), SPI pins (8,10,11,12) and MCLK (16).

Appreciate your help on how to properly connect these pins if unused.

Kind Regards,

Jejomar

over 6 years ago

0 Hamzeh Jaradat over 6 years ago

TI__Guru** 113170 points

Hello Jejomar,

Pins (33-36) - connect through 1k to GND
SPI pins (8,10,11,12) - connect 1k to gnd or x10: TRI-STATE™ by register
MCLK (16) - connect through 1k to GND

0 Steven(Shenzhen) Shi over 6 years ago

TI__Mastermind 30515 points

Hi Jejomar,

You can leave them open for the unused I/O pins since they have internal pull-down resistors. Also another option is that you can use the external pulled-down resistors in these unused pins.

best regards,

Steven

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DS90UB949-Q1: Unused pins