DS2480B+T&R Maxim Integrated Products, DS2480B+T&R Datasheet - Page 12

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

Specifications of DS2480B+T&R

• 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: Lead free / RoHS Compliant

Table 3. CONFIGURATION PARAMETER OVERVIEW
The numbers given for parameter 001 (Pulldown Slew Rate Control) are nominal values. They may vary
to some extent and are almost independent of the load on the 1-Wire bus. Information on how to select
the optimum value of this parameter is given in the Controlled Edges section .
For the parameters 010 (Programming Pulse Duration) and 011 (Strong Pullup Duration) one may select
indefinite duration. This value, however, should only be selected if one is not going to switch the device
to Data Mode. As long as the device stays in Command Mode, any pulse function (programming or
strong pullup) that uses one of these parameters can be terminated by sending the command code F1h.
Termination is not possible if the device is in Data Mode.
Parameter 111 (RS232 Baud Rate) has two functions. It selects the baud rate and allows inversion of the
signal at the RXD pin. Using one of the value codes 100 to 111 will set the polarity at RXD to the
opposite of what is defined by the logic level at the POL pin (asymmetry bit, see Figure 1). This may
reduce the component count in some applications of the device. Note that when changing the baud rate,
the DS2480B will send the command response byte at the new data rate.
A short explanation on the use of parameters 100 (Write-1 Low Time) and 101 (Data Sample
Offset/Write-0 Recovery Time) is given in the Timing Diagrams section later in this document.
Pulldown Slew Rate
Control
Programming Pulse
Duration
Strong Pullup Duration
Write-1 Low Time
Data Sample Offset and
Write 0 Recovery Time
RS232 Baud Rate
Description
Parameter
Par. Code
001
010
011
100
101
111
Standard
√
√
√
12 of 32
Configurable at
Flexible
√
√
√
√
√
√
Overdrive
√
√
√
Reg./Flex.
9.6kbps
15V/µs
524ms
512µs
8µs
3µs
3µs
Default
Overdrive
9.6kbps
15V/µs
524ms
512µs
1µs
1µs
3µs