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fixed tag (its 1-wire, not i2c)
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Kamil
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DS18B20 temp sensor IC DqDq pin is connected to PSENPSEN of controller in my application. 

But in datasheet its mentioned that its connected to I/O port. And

And second doubt is how I/O port senses temp. it? It should be connected to ADCADC pin of controller.

DS18B20 temp sensor IC Dq pin is connected to PSEN of controller in my application. But in datasheet its mentioned that its connected to I/O port. And second doubt is how I/O port senses temp. it should be connected to ADC pin of controller.

DS18B20 temp sensor IC Dq pin is connected to PSEN of controller in my application. 

But in datasheet its mentioned that its connected to I/O port.

And second doubt is how I/O port senses temp? It should be connected to ADC pin of controller.

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DS18B20 temp sensor IC

DS18B20 temp sensor IC Dq pin is connected to PSEN of controller in my application. But in datasheet its mentioned that its connected to I/O port. And second doubt is how I/O port senses temp. it should be connected to ADC pin of controller.