DS2482S-800+T&R Maxim Integrated Products, DS2482S-800+T&R Datasheet - Page 17

• Manufacturer Part Number: DS2482S-800+T&R
• Description: IC MASTER I2C-1WIRE 8CH 16-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of DS2482S-800+T&R

• 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)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
Figure 9. I²C Timing Diagram
NOTE: Timing is referenced to V
Writing to the DS2482
To write to the DS2482, 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 will acknowledge valid command codes and expected/valid
command parameters. Additional bytes or invalid command parameters will never be acknowledged.
Reading from the DS2482
To read from the DS2482, 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 will read from. The master
may continue reading the same register over and over again, without having to re-address 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 again in read mode.
I²C Communication—Legend
SYMBOL
<byte>
SCL
(Idle)
AD,0
AD,1
SDA
Sr
A\
S
P
A
STOP START
t
BUF
Bus Not Busy
START Condition
Select DS2482 for Write Access
Select DS2482 for Read Access
Repeated START Condition
STOP Condition
Acknowledged
Not Acknowledged
Transfer of 1 Byte
t
HD:STA
t
LOW
DESCRIPTION
t
R
ILMAX
and V
t
HD:DAT
IHMIN
t
t
F
HIGH
.
t
SU:DAT
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Repeated
SYMBOL
START
1WWB
WCFG
1WRS
1WRB
1WSB
DRST
CHSL
SRP
1WT
t
SU:STA
t
HD:STA
Command "Device Reset", F0h
Command "Write Configuration", D2h
Command "Channel Select", C3h
Command "Set Read Pointer", E1h
Command "1-Wire Reset", B4h
Command "1-Wire Write Byte", A5h
Command "1-Wire Read Byte", 96h
Command "1-Wire Single Bit", 87h
Command "1-Wire Triplet", 78h
Suppression
Spike
DESCRIPTION
t
SP
t
SU:STO