PCA9306: What is the role of the VREF?

Seung-Gon Hong

Prodigy 160 points

Part Number: PCA9306

Hi,

I am going to design a circuit using an I2C translator (PCA9306).

I don't know what is the role of the VREF? Could you explain it?

Thanks.

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 317280 points

Just connect them as shown in the datasheet.

See [FAQ] How do the LSF translators work?

0 Eric Schott1 over 3 years ago

TI__Guru 53575 points

Hi Seung-Gon,

The Vref pins are used in conjunction with the EN pin to generate the internal gate bias at the pass-FETs for the SCL and SDA signals. The voltage at Vref2 will be less than Vcc2 in voltage translation applications, so it is important to connect this pin and EN with a series resistor as shown below.

Let me know if you have any more questions.

Regards,
Eric Schott

Interface

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PCA9306: What is the role of the VREF?