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Point 1:

The 1-Wire slave device starts drawing current (internal micro or numeric processor is

running). The strong pullup (SPU) must be activated before the high current phase begins.

Point 2:

over. Typically START is activated shortly after SPU, but not before the 1-Wire slave device

has started drawing high current.

Point 3:

As soon as the DONE signal is high, the host micro ends the strong pullup by changing SPU

to low.

Point 4:

While the DONE signal is high, the host micro changes START to low; this may occur

simultaneously with the state change of SPU or later. When START changes to low, DONE

becomes low.

Figure 5. Timing References TXD to I/O

TXD

I/O

Figure 6. Timing References I/O to RXD

I/O

RXD