PCA9306 Vpass vs Vcc

David Park

Expert 6650 points

Other Parts Discussed in Thread: PCA9306, PCA9548A

Hi,

Could you provide Vpass vs Vcc graph of PCA9306?

Thanks.

over 10 years ago

0 Jonathan Valdez over 10 years ago

TI__Genius 16510 points

Hello David,

Could you elaborate on what you mean by a Vpass vs VCC graph?

As you are probably aware, the PCA9306 has a VREF1 and a VREF2 pin which are used to bias the EN pin, which controls the pass voltage through SDA/SCL. The relationship is not quite as simple as a single VCC pin vs how much passes.

0 David Park over 10 years ago in reply to Jonathan Valdez

TI__Expert 6650 points

Hi Jonathan,Thanks for your reply.
Could you answer the question about IBIS as well?
If there is another person for this question, please let me know.Thanks.

0 Jonathan Valdez over 10 years ago in reply to David Park

TI__Genius 16510 points

Hello David,

I am looking into the IBIS question.

For this Vpass vs VCC question, I can help you. I don't understand what it is you're asking for. Neither Vpass or VCC are terms used in the datasheet, so I am not sure to which curve you are referring.

0 David Park over 10 years ago in reply to Jonathan Valdez

TI__Expert 6650 points

Jonathan,Customer seems to refer Fig11 in PCA9548 datasheet.Thanks.

0 Jonathan Valdez over 10 years ago in reply to David Park

TI__Genius 16510 points

Hello David,

Figure 11 n the PCA9548A datasheet works due to there being only 1 power supply (VCC). In the PCA9306, this pass voltage across the SDA1/SDA2 pins is dependent upon the voltage supplied to EN and the current through the SDA1 to SDA2 pin.

Please see the Typical Characteristics Figures 1 and 2, which plot the RON through the SDA1 and SDA2/SCL1 and SCL2 pins for different EN voltages.

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PCA9306 Vpass vs Vcc