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參數(shù)資料
| 型號： | DS2490Y |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 48/50頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC BRIDGE CLIP USB TO 1-W 24SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 應(yīng)用： | USB |
| 接口： | 1 線 |
| 電源電壓： | 3 V ~ 5.5 V |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-SOIC W |
| 包裝： | 管件 |
| 安裝類型： | 表面貼裝 |
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DS2490
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DS2490 will then wait for tFILL to expire and then, depending on the value of embedded 1-WIRE RESET
command bits PST, NTF, and ICP, generate a command response byte that is available to the host.
If the test for interrupt or short reveals a logic 0, the DS2490 will wait for 4096s and then test the 1-
Wire bus again. If a logic 0 is detected, the 1-Wire bus is shorted and the DS2490 feedback response for
the 1-WIRE RESET communication command will indicate a short detection. If a logic 1 is detected, the
device will wait for tFILL to expire, after which it will load the feedback response value for the 1-WIRE
RESET command with an alarming presence pulse detect value. See the DEVICE FEEDBACK section
for additional details. No additional testing for a presence pulse will be done. The DS2490 will perform
the short/interrupt testing as described also at overdrive speed, although interrupt signaling is only
defined for regular speed.
As shown in Figure 6, a Write-1 and Read Data time slot is comprised of the segments tLOW1, tDSO, and
tHIGH. During Write-1 time slots, after the Write-1 low time (tLOW1) expires, the DS2490 waits for the
duration of the data sample offset and then samples the 1-Wire voltage to read the response. After this,
the waiting time tHIGH1 must expire before the time slot is complete. As shown in Figure 7, a Write-0 time
slot consists of the two segments tLOW0 and tREC0.
Since the defaults for regular speed exceed the 1-Wire sampling maximum for most 1-Wire devices
(tLOW1 + tDSO = 20s) it is recommended to always use flexible speed. The minimum flexible speed
settings tLOW1 = 4s and tDSO = 10s suffice for most applications. If the network is large or heavily
loaded, Write-1 low time (tLOW1) should be extended to more than 8s 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 Data Sample Offset value (tDSO) 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 tLOW1 + tDSO should not exceed 15s. Otherwise, the
slave device responding may have stopped pulling the bus low when transmitting a logic 0. Note that
some long line loading conditions can extend the line recovery so the total tLOW1 + tDSO can be extended.
Care must be taken to not violate the tMSR of the attached 1-Wire devices.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2490Y+ | 制造商:Maxim Integrated Products 功能描述:USB TO 1-WIRE BRIDGE 24SOIC W - Tape and Reel |
| DS24B33 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM |
| DS24B33 R | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM |
| DS24B33 T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM |
| DS24B33 TR | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM |
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