DS90UB921-Q1: DIN Pin State When it power up

Fery Feng

Intellectual 2270 points

Part Number: DS90UB921-Q1

Hi team,

Could you help to comfirm below two questions about DS90UB921:

Before doing any configurations to 921 after it power up, what is the state of the DIN pin, pull-up, pull-low or high-z?
When the PDB pull low, what is the state of the DIN pin, pull-up, pull-low or high-z?

Thank you.

over 9 years ago

0 Steven(Shenzhen) Shi over 9 years ago

TI__Mastermind 30515 points

Ferry,
1. during the power-on status, the power supplies are not stable, also dependent on the power on sequence, the DIN pin status is NOT deterministic;
2. when PDB is enabled, the DIN pin is floating.

regards,
Steven

Interface

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DS90UB921-Q1: DIN Pin State When it power up