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DS2482-100

Single-Channel 1-Wire Master

Function Commands

The DS2482-100 understands eight function com-

mands that fall into four categories: device control, I

communication, 1-Wire setup, and 1-Wire communica-

tion. The feedback path to the host is controlled by a

read pointer, which is set automatically by each func-

tion command for the host to efficiently access relevant

information. The host processor sends these com-

mands and applicable parameters as strings of one or

two bytes using the I

C interface. The I

C protocol

requires that each byte be acknowledged by the

receiving party to confirm acceptance or not be

acknowledged to indicate an error condition (invalid

code or parameter) or to end the communication. See

the

C Interface

section for details of the I

C protocol

including acknowledge.

The function commands are as follows:

1) Device Reset 5) 1-Wire Single Bit

2) Set Read Pointer 6) 1-Wire Write Byte

3) Write Configuration 7) 1-Wire Read Byte

4) 1-Wire Reset 8) 1-Wire Triplet

Table 1. Valid Pointer Codes

Device Reset

Command Code F0h

Command Parameter None

Description

Performs a global reset of device state machine logic. Terminates any ongoing 1-Wire

communication.

Typical Use Device initialization after power-up; reinitialization (reset) as desired.

Restriction None (can be executed at any time).

Error Response None

Command Duration Maximum 525ns. Counted from falling SCL edge of the command code acknowledge bit.

1-Wire Activity Ends maximum 262.5ns after the falling SCL edge of the command code acknowledge bit.

Read Pointer Position Status Register (for busy polling).

Status Bits Affected RST set to 1; 1WB, PPD, SD, SBR, TSB, DIR set to 0.

Configuration Bits Affected 1WS, APU, SPU set to 0.

Set Read Pointer

Command Code E1h

Command Parameter Pointer Code (see Table 1)

Description

Sets the read pointer to the specified register. Overwrites the read pointer position of any 1-Wire

communication command in progress.

Typical Use

To prepare reading the result from a 1-Wire Read Byte command; random read access of

registers.

Restriction None (can be executed at any time).

Error Response

If the pointer code is not valid, the pointer code is not acknowledged and the command is

ignored.

Command Duration None. The read pointer is updated on the rising SCL edge of the pointer code acknowledge bit.