ocr: Master Tx "reset pulse" Master Rx 960 480 us us maximum minimum 480 HS minimum DS2404 DS2404 Tx waits "presence pulse" Vcc 15-60us -60-240 uS 1 1-Wire Bus GND Line Type Legend: Bus master active low - DS2404 active low Both, bus master and DS2404 active low Resistor pull-up Figure 6: 2404 reset sequerce.