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参数资料
| 型号： | DS2409P/T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/18页 |
| 文件大小： | 0K |
| 描述： | IC COUPLER MICROLAN 1-WIRE 6TSOC |
| 标准包装： | 4,000 |
| 接口： | 1 线 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 封装/外壳： | 6-LSOJ |
| 供应商设备封装： | 6-TSOC |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
DS2409
6 of 18
DISCHARGE LINES [99h]
There may be situations where one has to force a power-on reset for parasitically powered 1-Wire devices
connected to the main or auxiliary output of the DS2409. For this purpose, the Discharge Lines
command has been implemented. This command first deactivates the output lines and then turns on the
pulldown transistors of both, the main and the auxiliary outputs. This state will be maintained until the
bus master accesses the coupler again and issues a different control function command. The duration of
the discharge time should be 100ms minimum and is controlled solely by the bus master.
Although any of the other control function commands will end the discharge cycle, it is recommended to
use the All Lines Off or Status Read/Write command to do so. This will allow the discharged lines to
fully recharge and prevent a sudden voltage droop on the active part of the network in case of a Direct-On
Main command. This precaution is not necessary with the Smart-On command.
DIRECT-ON MAIN [A5h]
The Direct-On Main command is typically used to activate the main 1-Wire output to subsequently issue
a reset pulse and access a device residing on the segment of the MicroLAN connected to the Main output
of the DS2409. If this command is received, the DS2409 will automatically set the auxiliary output to
inactive. Depending on the currently valid device status settings, the transistor at the control output may
change state (see Status Read/Write command).
SMART-ON MAIN [CCh]
When analyzing huge MicroLAN networks for changes in population it may be useful to limit the number
of devices participating in a Search ROM command. The smaller the number of participants, the faster
the responding devices are identified. The DS2409 supports the bus master in this process with the Smart-
On Main command. As a preparation for the subsequent steps, the first action of the Smart-On Main
command is deactivating the main output.
Compared to the Direct-On Main command, the Smart-On Main requires the bus master to follow the
function command with 16 more time slots. The first 8 time slots (reset stimulus) are translated by the
DS2409 as a reset low time on the Main 1-Wire output. Now, the bus master reads the reset response
byte. This generates the reset high time where devices connected to the Main 1-Wire output may assert
their presence pulse. If a presence pulse was found, several of the most significant bits of the reset
response byte will be zeros. After these 16 time slots are completed the Main 1-Wire output will be
activated (= through-connected to the 1-Wire input of the DS2409). Now, only the devices on the newly
activated segment of the MicroLAN are ready to receive a ROM function command optionally followed
by a memory function command. All other devices in the network will remain silent until the next reset
pulse is issued.
As with the Direct-On command, the Smart-On Main command will automatically set the auxiliary
output to inactive. Depending on the currently valid device status settings, the transistor at the control
output may change state (see Status Read/Write command). If the Smart-On Main command is terminated
by a 1-Wire reset pulse while receiving the reset stimulus, the DS2409 will immediately turn off the
pulldown transistor and let the output line go high.
SMART-ON AUXILIARY [33h]
This command works essentially the same way as the Smart-On Main command, but it affects the
auxiliary 1-Wire output. After the reset response byte is received by the bus master, the auxiliary output is
activated and the main output becomes inactive. Depending on the currently valid device status settings,
the transistor at the control output may change state (see Status Read/Write command).
Not
Recommended
for
New
Design
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2411 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Silicon Serial Number with Vcc Input |
| DS2411C/W | 制造商:Maxim Integrated Products 功能描述:SINGLE, UNSORTED UN-BACKLAPPED WAFER - Gel-pak, waffle pack, wafer, diced wafer on film |
| DS2411MP000 | 制造商:Thomas & Betts 功能描述:200A,PLG,3P4W,MG,411,220V,400HZ |
| DS2411P | 功能描述:序列号注册 RoHS:否 制造商:Maxim Integrated 数据总线宽度: 电源电压-最大: 电源电压-最小: 最大工作温度: 最小工作温度: 安装风格: 封装 / 箱体: |
| DS2411P/R | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Silicon Serial Number with VCC Input |
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