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I am reading the datasheet for the of the P82B96 an i2c extender and the datasheet recommended a circuit that protects the i2c master against short circuit.

On Figure 14.

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I have boxed the circuit part in question but i am not able to grasp how it protects it. The circuit almost looks like a constant current circuit.

A typical circuit looks like this without protection

enter image description here

On the protected version SCL RX is now tied to V+ instead of shorted to TX does this mean the slave cannot initiate the transaction now (assuming the slave is also an mCU).

Can anyone help explain to me what is happening on the short circuit protection?

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  • \$\begingroup\$ This is explained in the first paragraph of section 10.2.4. \$\endgroup\$ – CL. Dec 28 '20 at 9:30

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