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| 型号： | DS2408S+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/39页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH 8-CHAN ADDRESS 16SOIC |
| 标准包装： | 2,500 |
| 接口： | 1 线 |
| 输入/输出数： | 8 |
| 中断输出： | * |
| 电源电压： | 2.8 V ~ 5.25 V |
| 工作温度： | * |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
| 包括： | * |
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DS2408
24 of 39
1-WIRE SIGNALING
The DS2408 requires strict protocols to ensure data integrity. The protocol consists of four types of
signaling on one line: Reset Sequence with Reset Pulse and Presence Pulse, Write-Zero, Write-One, and
Read-Data. Except for the presence pulse, the bus master initiates all these signals. The DS2408 can
communicate at two different speeds, standard speed, and overdrive speed. If not explicitly set into the
overdrive mode, the DS2408 will communicate at standard speed. While in overdrive mode, the fast
timing applies to all waveforms.
To get from idle to active, the voltage on the 1-Wire line needs to fall from VPUP below the VTL threshold.
To get from active to idle, the voltage needs to rise from VILMAX past the VTH threshold. The VILMAX
voltage is relevant for the DS2408 when determining a logical level, not triggering any events.
Figure 13 shows the initialization sequence required to begin any communication with the DS2408. A
Reset Pulse followed by a Presence Pulse indicates the DS2408 is ready to receive data, given the correct
ROM and control function command. If the bus master uses slew-rate control on the falling edge, it must
pull down the line for tRSTL + tF to compensate for the edge. A tRSTL duration of 480s or longer will exit
the overdrive mode returning the device to standard speed. If the DS2408 is in overdrive mode and tRSTL
is no longer than 80s the device will remain in overdrive mode.
Figure 13. INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES”
After the bus master has released the line it goes into receive mode (RX). The 1-Wire bus is then pulled
to VPUP via the pullup resistor or, in case of a DS2480B driver, by active circuitry. When the VTH
threshold is crossed, the DS2408 waits for tPDH and then transmits a Presence Pulse by pulling the line
low for tPDL. To detect a presence pulse, the master must test the logical state of the 1-Wire line at tMSP.
The tRSTH window must be at least the sum of tPDHMAX, tPDLMAX, and tRECMIN. Immediately after tRSTH is
expired, the DS2408 is ready for data communication. In a mixed population network, tRSTH should be
extended to a minimum of 480s at standard speed and 48s at overdrive speed to accommodate other 1-
Wire devices.
相关PDF资料 |
PDF描述 |
|---|---|
| DS2409P/T&R | IC COUPLER MICROLAN 1-WIRE 6TSOC |
| DS2411P+T&R | IC SILICON SERIAL NUMBER 6TSOC |
| DS2413Q+T&R | IC SWITCH 2CH ADDRESS 6-TDFN |
| DS2480B+ | IC LINE DRVR W/SENSOR 1-W 8-SOIC |
| DS2482X-100+T | IC MASTER I2C-1WIRE 1CH 9-WLP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2409 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:MicroLAN Coupler |
| DS2409FRAB0 | 制造商:Thomas & Betts 功能描述:200A,REC,3P4W,MG,3P220V,SC |
| DS2409MP000 | 制造商:Thomas & Betts 功能描述:200A,PLG,3P4W,MG,409,3P220V |
| DS2409P | 功能描述:接口 - 专用 RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
| DS2409P/T&R | 制造商:Maxim Integrated Products 功能描述:IC COUPLER MICROLAN 1-WIRE 6TSOC |
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