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The l-Wire bus and CPP can provide sufficient parasite power to the DS18820-PAR for most operations as long as the specified timing and voltage requirements are met (refer to the DC ELECTRICAL CHARACTERISTICS and the AC ELECTRICAL CHARACTERISTICS sections of this data sheet). However, when the DS18820-PAR is performing temperature conversions or copying data from the scratchpad memory to EEPROM, the operating current can be as high as l.5 mA. This current can cause an unacceptable voltage drop across the weak l-Wire pullup resistor and is more current than can be supplied by CPP. To assure that the DS18820-PAR has sufficient supply current, it is necessary to provide a strong pullup on the l-Wire bus whenever temperature conversions are taking place or data is being copied from the scratchpad to EEPROM. This can be accomplished by using a MOSFET to pull the bus directly to the rail as shown in Figure 2. The l-Wire bus must be switched to the strong pullup within 10 Us (max) after a Convert T [44h] or Copy Scratchpad [48h] command is issued, and the bus must be held high by the pullup for the duration of the conversion (tconv) or data transfer (twr = 10 ms). No other activity can take place on the l-Wire bus while the pullup is enabled.
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