DS2482S-800+ Maxim Integrated Products, DS2482S-800+ Datasheet - Page 17

• Manufacturer Part Number: DS2482S-800+
• Description: IC I2C TO 1WIRE BRIDGE 16SOIC
• Manufacturer: Maxim Integrated Products
• Type: Eight Channel 1 Wire Masterr

Specifications of DS2482S-800+

• Controller Type: I²C Bus Controller
• Interface: I²C
• Voltage - Supply: 3.3 V, 5V
• Current - Supply: 750µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Package: 16SOIC N
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

To write to the DS2482-100, the master must access
the device in write mode, i.e., the slave address must
be sent with the direction bit set to 0. The next byte to
be sent is a command code, which, depending on the
command, may be followed by a command parameter.
The DS2482-100 acknowledges valid command codes
and expected/valid command parameters. Additional
bytes or invalid command parameters are never
acknowledged.
To read from the DS2482-100, the master must access
the device in read mode, i.e., the slave address must
be sent with the direction bit set to 1. The read pointer
determines the register that the master reads from. The
master can continue reading the same register over
and over again, without having to readdress the device,
e.g., to watch the 1WB changing from 1 to 0. To read
from a different register, the master must issue the Set
Read Pointer command and then access the DS2482-
100 again in read mode.
some time later the slave may refuse to accept data,
possibly because of an invalid command code or
parameter. In this case, the slave device does not
acknowledge any of the bytes that it refuses and
leaves SDA high. In either case, after a slave has
failed to acknowledge, the master first should gener-
ate a repeated START condition or a STOP condition
followed by a START condition to begin a new data
transfer.
Not Acknowledged by Master: At some time when
receiving data, the master must signal an end of
data to the slave device. To achieve this, the master
does not acknowledge the last byte that it has
received from the slave. In response, the slave
releases SDA, allowing the master to generate the
STOP condition.
Reading from the DS2482-100
______________________________________________________________________________________
Writing to the DS2482-100
Single-Channel 1-Wire Master
See Tables 4 and 5 for the I
and data direction codes.
Table 4. I
Table 5. Data Direction Codes
SYMBOL
<byte>
WCFG
1WWB
1WRB
1WRS
1WSB
AD, 0
AD, 1
DRST
(Idle)
1WT
SRP
Sr
A\
S
P
A
I 2 C Communication Examples
2
Master-to-Slave
C Communication—Legend
START Condition
Select DS2482-100 for Write Access
Select DS2482-100 for Read Access
Repeated START Condition
STOP Condition
Acknowledged
Not Acknowledged
Bus Not Busy
Transfer of One Byte
Command “Device Reset”, F0h
Command “Set Read Pointer”, E1h
Command “Write Configuration”, D2h
Command “1-Wire Reset”, B4h
Command “1-Wire Single Bit”, 87h
Command “1-Wire Write Byte”, A5h
Command “1-Wire Read Byte”, 96h
Command “1-Wire Triplet”, 78h
DESCRIPTION
2
Slave-to-Master
C communication legend
17