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Original question:

PCA9306: PCA9306

PCA9306: PCA9306 EN VREF2 voltage

kevin.huang_FJXM
Expert 2925 points

Part Number: PCA9306

if  VREF1= SCL1 = SDA1 = 1.8V , VREF2= 2.85 V,  EN =3.3V,   SCL2 SDA2  2.0V,  Abnormal

if  VREF1= SCL1 = SDA1 = 1.8V , VREF2= 2.85 V,  EN =2.85V,   SCL2 SDA2  2.85V,  Normal work

Why the voltage of VREF2 needs to be equal to that of EN

  • 0
    TI__Guru 62920 points

    With the device used as intended, VREF2 and EN will be tied together and the device will regulate the internal bias voltage used for the FET switches so that the device only conducts when one side's voltage reduces below the VREF1 level.  Without this connection, though, the FETs may conduct unintentionally and cause current flow between the two sides.  For level translating applications, please follow the recommended connections shown in Figure 6 of the datasheet.

    Regards,
    Max