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参数资料
| 型号： | DS2480B+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/32页 |
| 文件大小： | 0K |
| 描述： | IC LINE DRVR W/SENSOR 1-W 8-SOIC |
| 产品培训模块： | 1-Wire Communications Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 线路驱动器，发射器 |
| 驱动器/接收器数： | 1/0 |
| 规程： | RS232 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1429 (CN2011-ZH PDF) |
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DS2480B
Maxim Integrated........................................................................................................................................................................................... 20
PULSE WAVEFORM, ARMED
As explained in the Communication Commands section, bit 1 of the Pulse command allows the arming of
a strong pullup to 5V if the bit is set to 1. If the strong pullup is armed and the device is switched to Data
Mode, there will be a strong pullup immediately following every byte on the 1-Wire bus. This mode is
implemented to provide extra energy when writing to EEPROM devices or to do a temperature
conversion with the DS1920 temperature iButton, for example. These devices need a strong pullup
immediately after the power-consuming activity has been initiated by a command code.
To arm the strong pullup, one usually generates a “dummy” pulse with bit 1 being 1 while the device is in
Command Mode. To save time, the dummy pulse may immediately be terminated by sending the
Termination command, code F1h. Then one switches to Data Mode and sends a command code that
makes one or more slaves on the 1-Wire bus require extra energy. After the command execution is
finished, one switches back to Command Mode and disarms the strong pullup by generating another
dummy pulse. A complete temperature conversion sequence that shows the use of the armed pulse is
included in the Software Driver Examples section .
Figure 8. STRONG PULLUP TO 5V, ARMED, PREDEFINED DURATION
Figures 8 shows the timing of the strong pullup in Data Mode. At t1 the 8th time slot of the byte sent to the
1-Wire bus is completed. Without any delay the DS2480B now activates the strong pullup and
simultaneously starts sending the data response byte to the host. At t2 the strong pullup ends and the
DS2480B sends a pulse response byte to the host. The idle time between t2 and t3 is comprised of the time
to transmit the pulse response byte, plus the response time of the host plus the time to transmit the
command and/or data to generate the next time slot. Since in Data Mode the Pulse Termination command
is not applicable, the duration of the strong pullup must be limited. See Table 4, parameter 011 (Strong
Pullup Duration) for details.
Infinite duration, if accidentally selected, will require a power-on or master reset cycle to get the
DS2480B back to communicating with the host.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2480B | 制造商:Maxim Integrated Products 功能描述:IC SERIAL LINE DRIVER 2480 SOIC8 |
| DS2480B/T&R | 功能描述:缓冲器和线路驱动器 RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| DS2480B+ | 功能描述:缓冲器和线路驱动器 Serial - 1-Wire Line Driver RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| DS2480B+R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Serial to 1-Wire Line Driver |
| DS2480B+T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Serial to 1-Wire Line Driver |
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