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參數(shù)資料
| 型號： | DS2490S |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Bus Controller |
| 英文描述： | UNIVERSAL SERIAL BUS CONTROLLER, PDSO24 |
| 封裝： | 0.300 INCH, SO-24 |
| 文件頁數(shù)： | 49/51頁 |
| 文件大?。?/td> | 444K |
| 代理商： | DS2490S |
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DS2490
7 of 50
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.
If the network is large or heavily loaded, flexible speed should be selected and the 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 22s. Otherwise, the slave device responding may have
stopped pulling the bus low when transmitting a logic 0.
WRITE 1 AND READ DATA TIME SLOT Figure 6
NOMINAL TIMING VALUES
SPEED
t
LOW1
t
DSO
t
HIGH1
t
SLOT
REGULAR
8s
6s
54s
68s
OVERDRIVE
1s
8s
10s
FLEXIBLE*
8s to 15s
3s to 10s 54s
65s to 79s
*Powerup defaults for Flexible speed: t
LOW1
= 12s, t
DSO
= 7s
相關(guān)PDF資料 |
PDF描述 |
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| DS2502P | 128 X 8 OTPROM, PDSO6 |
| DS2502S | 128 X 8 OTPROM, PDSO8 |
| DS2502 | 128 X 8 OTPROM, PBCY3 |
| DS2505/T&R | 16K X 1 OTPROM, PBCY3 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2490S+ | 制造商:Maxim Integrated Products 功能描述:USB TO 1-WIRE BRIDGE 24SOIC W - Rail/Tube 制造商:Maxim Integrated Products 功能描述:USB 1-W BRIDGE CHIP 24-SO LF 制造商:Maxim Integrated Products 功能描述:Bulk |
| DS2490S+T&R | 制造商:Maxim Integrated Products 功能描述:USB TO 1-WIRE BRIDGE 24SOIC W - Tape and Reel |
| DS2490S+TR | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:USB to 1-Wire Bridge Chip |
| DS2490X | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:USB to 1-Wire Bridge Chip(468.41 k) |
| DS2490X/T&R | 功能描述:接口 - 專用 RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59 |
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