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DS2480S Datasheet(PDF) 10 Page - Dallas Semiconductor |
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DS2480S Datasheet(HTML) 10 Page - Dallas Semiconductor |
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10 / 26 page  DS2480 042498 10/26 CONFIGURATION COMMAND OVERVIEW Table 3 PD i i PC d Configurable at Default Parameter Description Par. Code Regular Flexible Overdrive Reg./Flex. Overdrive Pull–Down Slew Rate Control 001 √ 15 V/ µs 15 V/ µs Programming Pulse Duration 010 √ √ √ 512 µs 512 µs Strong Pull–up Duration 011 √ √ √ 524 ms 524 ms Write 1 low time 100 √ 8 µs 1 µs Data Sample Offset and Write 0 Recovery Time 101 √ 3 µs 3 µs 1 µs 3 µs RS232 Baud Rate 111 √ √ √ 9.6k bits/s 9.6k bits/s The numbers given for parameter 001 (Pull–Down Slew Rate Control) are nominal values. They may vary as specified in the Electrical Characteristics section 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 section “Controlled Edges”. For the parameters 010 (Programming Pulse Duration) and 011 (Strong Pull–Up 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 pull–up) that uses one of these parameters can be terminated by sending the command code F1h. Termination is not pos- sible 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 chang- ing the baud rate, the DS2480 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 Recov- ery Time) is given in the section “Timing Diagrams” later in this document. The parameter code 110 is reserved for future extensions; one should not change the value code from its default setting. CONFIGURATION PARAMETER VALUE CODES Table 4 PC d Value Codes Ui Parameter Code 000 001 010 011 100 101 110 111 Unit 001 (PDSRC) 15 2.2 1.65 1.37 1.1 0.83 0.7 0.55 V/ µs 010 (PPD) 32 64 128 256 512 1024 2048 ∞ µs 011 (SPUD) 16.4 65.5 131 262 524 1048 2096 ∞ ms 100 (W1LT) 8 9 10 11 12 13 14 15 µs 101 (DSO/W0RT) 3 4 5 6 7 8 9 10 µs 111 (RBR) 9.6 19.2 57.6 115.2 9.6 19.2 57.6 115.2 kbits/s |
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