Rainbow-electronics DS2422 Instrukcja Użytkownika Pobierz pdf (Strona 35)

DS2422

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bus performs a reset. The DS2422 will communicate properly when used in conjunction with a DS2480B or

DS2490 1-Wire driver and adapters that are based on these driver chips.

Figure 13. Hardware Configuration

Open Drain

Port Pin

RX = RECEIVE

TX = TRANSMIT

100

MOSFET

PUP

RXDATA

PUP

5 µA

Typ.

BUS MASTER DS2422 1-Wire PORT

TRANSACTION SEQUENCE

The protocol for accessing the DS2422 through the 1-Wire port is as follows:

§ Initialization

§ ROM Function Command

§ Memory/Control Function Command

§ Transaction/Data

INITIALIZATION

All transactions on the 1-Wire bus begin with an initialization sequence. The initialization sequence consists of a

reset pulse transmitted by the bus master followed by presence pulse(s) transmitted by the slave(s). The presence

pulse lets the bus master know that the DS2422 is on the bus and is ready to operate. For more details, see the

1-Wire Signaling section.

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Rainbow-electronics DS2422 Instrukcja Użytkownika Strona 35