DS2482-100 查看數據表（PDF） - Maxim Integrated

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DS2482-100

Single-Channel 1-Wire Master

Maxim Integrated 

DS2482-100

Single-Channel 1-Wire Master

Function Commands

The DS2482-100 understands eight function com-

mands that fall into four categories: device control, I2C

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 I2C interface. The I2C 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 I2C Interface section for details of the I2C 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

REGISTER SELECTION

Status Register

Read Data Register

Configuration Register

CODE

F0h

E1h

C3h

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

Error Response

Command Duration

1-Wire Activity

Read Pointer Position

Status Bits Affected

Configuration Bits Affected

None (can be executed at any time).

None

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

Ends maximum 262.5ns after the falling SCL edge of the command code acknowledge bit.

Status Register (for busy polling).

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

1WS, APU, SPU set to 0.

Set Read Pointer

Command Code

Command Parameter

E1h

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

1-Wire Activity

Read Pointer Position

Status Bits Affected

Configuration Bits Affected

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

Not affected.

As specified by the pointer code.

None

None

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