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PCA9614 SCL and SDA hang at 0 when bus is in idle

Question asked by Giovanni Bonomini on Jan 11, 2018
Latest reply on Jan 14, 2018 by Giovanni Bonomini

Goodmorning,

i'm using the PCA9614 in the configuration of fig.6 of the datasheet (at page 10) with R1 = 604 Ohm and R2 = 121 Ohm with Vss1 not conneted to Vss2 and Vddb1 not connected to Vddb2.

The device is communicating correctly with the devices on the bus but after a while the communication stop, after that is impossible to recover the device, seems broken; i made more investigation and seems that the idle condition (D+ > D-) on the bus is not seen and the SCL line and SDA line hang at 0, like if the bidirectional function of the device is broken.

 

I can't understand where is the problem, how the device can break in this way we are missing something in the hardware?

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