DS90UB947-Q1: detect I2C

Bang Duong

Hi all,

I can't detect DS90UB947 I2C address.

I have resistor pull-up 4.7k for both pin SDA, SCL to VDDI2C 3.3V ; I2CSEL leave floating; INTB pull-up 4.7k to VDDIO 1.8V;

What can I do for detect I2C address?

Brs,

Bang

over 8 years ago

0 Bang Duong over 8 years ago

Intellectual 370 points

Hi all,
I tried set appropriate voltage on the IDx input , but still cant detect DS90UB947 I2C address.
I really need your support.
Brs,
Bang

0 Davor Glisic over 8 years ago in reply to Bang Duong

TI__Expert 8165 points

Hello-

The I2C address is determined based on measuring the voltage on the IDx pin during the device power-up. Are you correctly setting the resistor divider network per datasheet recommendations? Ensure that you add some decoupling capacitance to filter out any noise on the IDx pin. Follow the connection diagram in the datasheet. Are you following the recommended power up sequence?

Regards,
Davor

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DS90UB947-Q1: detect I2C