DS90UB947-Q1: DS90ub947 I2C power supply question

Jimmy Huang22

Expert 1470 points

Part Number: DS90UB947-Q1

Hi,

DS90ub947 power supply and I/O power supply is 1.8V max, Why i2C can support 3.3V power ? thanks!

0 Stone Zeng over 8 years ago

there is I2CSEL pin for I2C Voltage Level Strap Option. level shift has been implied internally.

Tie to VDDIO with a 10kΩ resistor for 1.8V I2C operation.

Leave floating for 3.3V I2C operation.

0 Steven(Shenzhen) Shi over 8 years ago in reply to Stone Zeng

Yes, it is dependent on VDDIC voltage. please see page6 in d/s.

best regards,
Steven

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