Rainbow-electronics DS2482-800 Bedienungsanleitung PDF herunterladen (Seite 11)

DS2482-800: Eight-Channel 1-Wire Master

11 of 22

Channel Select

Command Code

C3h

Command Parameter

Selection Code

Description

Sets the 1-Wire IO channel for subsequent 1-Wire communication

commands. NOTE: The selection code read back is different from the

code written. See the table below for the respective values.

Typical Use

Selecting a 1-Wire IO channel other that IO0; randomly selecting one of

the available 1-Wire IO channels.

Restriction

1-Wire activity must have ended before the DS2482 can process this

command.

Error Response

Command code and parameter will not be acknowledged if 1WB = 1 at the

time the command code is received and the command will be ignored.

If the selection code is not valid, the selection code will not be

acknowledged and the command will be ignored.

Command Duration

None; the channel selection register is updated on the rising SCL edge of

the selection code acknowledge bit.

1-Wire Activity

None

Read Pointer Position

Channel Selection Register (to verify write)

Status Bits Affected

None

Configuration Bits Affected

None

Valid Channel Selection Codes

Channel Selection Code (to be written) Code (read back)

Channel IO0 (default) F0h B8h

Channel IO1 E1h B1h

Channel IO2 D2h AAh

Channel IO3 C3h A3h

Channel IO4 B4h 9Ch

Channel IO5 A5h 95h

Channel IO6 96h 8Eh

Channel IO7 87h 87h

Figure 5. 1-Wire Reset/Presence Detect Cycle

Pullup DS2482 Pulldown 1-W Slave Pulldown

RSTL

RSTH

RESET PULSE PRESENCE/SHORT DETECT

IH1

IL1

MSP

For presence-pulse masking and pullup details see Figure 3.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 21 22

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