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参数资料
| 型号： | DS2480 |
| 英文描述： | Serial 1.Wire Line Driver |
| 中文描述： | 串行、1-Wire线驱动器 |
| 文件页数： | 17/26页 |
| 文件大小： | 185K |
| 代理商： | DS2480 |
DS2480
042498 17/26
PULSE WAVE FORM, ARMED
As explained in section Communication Commands, bit
1 of the pulse command allows the arming of a strong
pull–up to 5V if the bit is set to 1. If the strong pull–up is
armed and the device is switched to data mode, there
will be a strong pull–up 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 Tempera-
ture iButton, for example. These devices need a strong
pull–up immediately after the power–consuming activity
has been initiated by a command code.
To arm the strong pull–up, 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 pull–up by gen-
erating another dummy pulse. A complete temperature
conversion sequence that shows the use of the armed
pulse is included in Section “Software Driver
Examples”.
STRONG PULL–UP TO 5V, ARMED, PREDEFINED DURATION
Figure 8
END OF 8th
TIME SLOT
5V
0V
IDLE
TIME
BEGIN OF NEXT
TIME SLOT
t
SPU
t
1
t
2
t
3
Figures 8 shows the timing of the strong pull–up in data
mode. At t
1
the 8th time slot of the byte sent to the
1–Wire bus is completed. Without any delay the
DS2480 now activates the strong pull–up and simulta-
neously starts sending the data response byte to the
host. At t
2
the strong pull–up ends and the DS2480
sends a pulse response byte to the host. The idle time
between t
2
and t
3
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 pull–up must
be limited. See Table 4, parameter 011 (Strong Pull–Up
Duration) for details. Selecting infinite duration will
require a power–on or master reset cycle to get the
DS2480 back to communicating with the host.
相关PDF资料 |
PDF描述 |
|---|---|
| DS2480S | Serial 1.Wire Line Driver |
| DS2490 | USB to 1-Wire Bridge Chip |
| DS2490S | USB to 1-Wire Bridge Chip |
| DS2502-E64 | IEEE EUI-64 Node Address Chip |
| DS26334 | 3.3V, 16-Channel, E1/T1/J1 Short and Long-Haul Line Interface Unit |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2480B | 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 | 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 |
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