Rainbow-electronics DS2482-800 Manual do Utilizador descarregar pdf (Página 18)

DS2482-800: Eight-Channel 1-Wire Master

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Data Direction Codes

Master-to-Slave Slave-to-Master

I²C Communication Examples

Device Reset, e.g., after power-up

S AD,0 A DRST A Sr AD,1 A <byte> A\ P

This example includes an optional read access to verify the success of the command.

Write Configuration, e.g., before starting 1-Wire activity power-up

Case A: 1-Wire idle (1WB = 0)

S AD,0 A WCFG A <byte> A Sr AD,1 A <byte> A\ P

This example includes an optional read access to verify the success of the command.

Case B: 1-Wire busy (1WB = 1)

S AD,0 A WCFG A\ P

The master should stop and restart as soon as the DS2482 does not acknowledge the command code.

Channel Select, e.g., to select another 1-Wire channel

Case A: 1-Wire idle (1WB = 0)

S AD,0 A CHSL A E1h A Sr AD,1 A <byte> A\ P

E1h is the valid channel selection code for IO1. This example includes an optional read access to verify the

success of the command.

Case B: 1-Wire idle (1WB = 0), invalid channel selection code

S AD,0 A CHSL A E5h A\ P

E5h is an invalid channel selection code.

Case C: 1-Wire busy (1WB = 1)

S AD,0 A CHSL A\ P

The master should stop and restart as soon as the DS2482 does not acknowledge the command code.

Set Read Pointer, e.g., to read from another register

Case A: valid read pointer code

S AD,0 A SRP A C3h A P

C3h is the valid read pointer code for the configuration register.

Case B: invalid read pointer code

S AD,0 A SRP A E5h A\ P

E5h is an invalid read pointer code.

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Rainbow-electronics DS2482-800 Manual do Utilizador Página 18