Does the PN7150ARD (OM5578) board require pull-up resistors to be added for I2C bus

[gerrikoio]

I have the OM5578 demo board for the PN7150 NFC SBC.

I have reviewed the schematics for the shield and for the PN7150 and I cannot see any pull-up resistors attached to the I2C SDA and SCL lines.

So, are these required as it is not explicitly explained in the documentation and I usually assume that an R3 compatible interface board (or shield) would have standardised and included them on the shield if they were required?

So I'm a bit confused and seeking advice.

Thanks.

[weidong_sun]

Hello Colin,

      I2C interface on PN7150 meets standard I2C protocol, So these 2 pins on PN7150 is Open Drain. But  On OM5578 board, the 2 pins are not pulled up to HIGH via 10K/4.7k resistor. If you want to use I2C to communicate with MCU or Processor, Please pull these 2 pins up to HIGH on MCU side!

Have a nice day!

BR,

NXP TIC Weidong Sun

[gerrikoio]

Brilliant, that's a great help. Thanks for the clarification.

[weidong_sun]

You are welcome!

Have a nice day!

Weidong