ds2482-101 Maxim Integrated Products, Inc., ds2482-101 Datasheet - Page 20

• Manufacturer Part Number: ds2482-101
• Description: Single-channel 1-wire Master With Sleep Mode
• Manufacturer: Maxim Integrated Products, Inc.

Single-Channel 1-Wire Master with Sleep Mode
20
1-Wire Single Bit (To Generate a Single Time Slot on the 1-Wire Line)
Case A: 1-Wire Idle (1WB = 0), No Busy Polling
The idle time is needed for the 1-Wire function to complete. Then access the device in read mode to get the
result from the 1-Wire Single Bit command.
Case B: 1-Wire Idle (1WB = 0), Busy Polling Until the 1-Wire Command is Completed
When 1WB has changed from 1 to 0, the Status Register holds the valid result of the 1-Wire Single Bit command.
Case C: 1-Wire Busy (1WB = 1)
The master should stop and restart as soon as the DS2482-101 does not acknowledge the command code.
1-Wire Write Byte (To Send a Command Code to the 1-Wire Line)
Case A: 1-Wire Idle (1WB = 0), No Busy Polling
33h is the valid 1-Wire ROM function command for Read ROM. The idle time is needed for the 1-Wire function to
complete. There is no data read back from the 1-Wire line with this command.
Case B: 1-Wire Idle (1WB = 0), Busy Polling Until the 1-Wire Command is Completed.
When 1WB has changed from 1 to 0, the 1-Wire Write Byte command is completed.
Case C: 1-Wire Busy (1WB = 1)
The master should stop and restart as soon as the DS2482-101 does not acknowledge the command code.
S
S
S
S
S
S
______________________________________________________________________________________
AD,0
AD,0
AD,0
AD,0
AD,0
AD,0
A
A
A
A
A
A
1WWB
1WWB
1WWB
1WSB
1WSB
1WSB
A\
A\
A
A
A
A
<byte>
<byte>
33h
33h
S
P
P
AD,1
Sr
Sr
A
A
A
A
I 2 C Communication Examples (continued)
AD,1
AD,1
A
P
P
<byte>
(Idle)
(Idle)
A
A
REPEAT UNTIL THE 1WB BIT
REPEAT UNTIL THE 1WB BIT
HAS CHANGED TO 0.
HAS CHANGED TO 0.
<byte>
<byte>
A\
P
A
A
<byte>
<byte>
A\
A\
P
P