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參數(shù)資料
| 型號： | DS2480B+T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LINE DRVR W/SENSOR 1-W 8SOIC |
| 產(chǎn)品培訓模塊： | 1-Wire Communications Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 系列： | * |
| 其它名稱： | DS2480B+T&RDKR |
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DS2480B
Maxim Integrated........................................................................................................................................................................................... 14
CONTROLLED EDGES
One of the tasks of the DS2480B is to actively shape the edges of the 1-Wire communication waveforms.
This speeds up the recharging of the 1-Wire bus (rising edges) and reduces ringing of long lines (falling
edges). The circuitry for shaping rising edges is always on. The slew rate of falling edges is actively
controlled only at flexible speed and requires the parameter for slew rate control being different from its
power-on default value.
All Rising Edges
The active pullup of the rising edges reduces the rise time on the 1-Wire bus significantly compared to a
simple resistive pullup. Figure 4 shows how the DS2480B is involved in shaping a rising edge.
Figure 4. ACTIVE PULLUP
The circuit operates as follows: At t1 the pulldown (induced by the DS2480B or a device on the bus) ends.
From this point on the 1-Wire bus is pulled high by the weak pullup current IWEAKPU provided by the
DS2480B. The slope is determined by the load on the bus and the value of the pullup current. At t2 the
voltage crosses the threshold voltage VIAPO. Now the DS2480B switches over from the weak pullup
current IWEAKPU to the higher current IACTPU. As a consequence, the voltage on the bus now rises faster. As
the voltage on the bus crosses the threshold VIAPTO at t3, a timer is started. As long as this timer is on
(tAPUOT), the IACTPU current will continue to flow. After the timer is expired, the DS2480B will switch
back to the weak pullup current. Excessive noise on the 1-Wire line at the VIAPTO level can cause an
undesirable trip of the active pullup. External R-C filtering as discussed in the HARDWARE
APPLICATION EXAMPLES section and Application Note 148 should be used to prevent false triggering.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2480S | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Serial 1.Wire Line Driver |
| DS2482-100 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Single-Channel 1-Wire Master |
| DS2482-100_12 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Single-Channel 1-Wire Master |
| DS2482-101 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Single-Channel 1-Wire Master with Sleep Mode |
| DS2482-101_12 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Single-Channel 1-Wire Master with Sleep Mode |
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