DS2480B Maxim Integrated Products, DS2480B Datasheet - Page 17

• Manufacturer Part Number: DS2480B
• Description: IC LINE DRVR W/SENSOR 1-W 8-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Line Driver, Transmitterr

Specifications of DS2480B

• Number Of Drivers/receivers: 1/0
• Protocol: RS232
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

A Write-1 and Read Data time slot is comprised of the segments t
time slots, after the Write-1 low time t
offset and then samples the voltage at the 1-Wire bus to read the response. After this, the waiting time
t
t
If the network is large or heavily loaded, one should select flexible speed and extend t
8ms to allow the 1-Wire bus to completely discharge. Since a large or heavily loaded network needs more
time to recharge, it is also recommended to delay sampling the bus for reading. A higher value for t
will increase the voltage margin and also provide extra energy to the slave devices when generating a
long series of write 0 time slots. However, the total of t
the slave device responding may have stopped pulling the bus low when transmitting a logic 0.
The idle time between time slots within a byte or during a 12-bit sequence while the Search Accelerator is
on is 0. Between bytes, 12-bit search sequences and single bits the idle time depends on the RS232 data
rate and the host’s response time. The response byte is sent to the host as soon as the last time slot of a
byte, 12-bit sequence or the command is completed.
Figure 6b. WRITE-1 AND READ DATA TIME SLOT
Figure 6c. WRITE-0 TIME SLOT
*In a 5V environment (±1V, full temperature range) the tolerance of the internal time base of 1-Wire
slave devices is much narrower than what it is when operated at the minimum voltage of 2.8V. Therefore,
the timing generated by the DS2480B is in compliance with the requirements of all MicroLAN-
compatible 1-Wire devices.
HIGH1
LOW0
Regular
Overdrive
Flexible
Regular
Overdrive
Flexible
and t
must expire before the time slot is complete. A Write-0 time slot only consists of the two segments
Speed
REC0
Speed
.
8µs to 15µs
t
LOW1
8µs
1µs
t
57µs
57µs
LOW1
LOW0
7µs
is over, the DS2480B waits for the duration of the data sample
3µs to 10µs
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t
3µs
1µs
DSO
LOW1
3µs to 10µs
+ t
t
DSO
3µs
3µs
REC0
LOW1
should not exceed 22ms*. Otherwise
t
49µs
49µs
HIGH1
8µs
, t
DSO
and t
HIGH
60µs to 67µs
LOW1
. During Write-1
60µs to 74µs
t
60µs
10µs
SLOT
t
to more than
60µs
SLOT
10µs
*
*
DSO