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參數(shù)資料
| 型號： | DS2482-800 |
| 英文描述： | Eight-Channel 1-Wire Master |
| 中文描述： | 八通道1-Wire主控制器 |
| 文件頁數(shù)： | 6/22頁 |
| 文件大小： | 261K |
| 代理商： | DS2482-800 |
DS2482-800: Eight-Channel 1-Wire Master
6 of 22
Channel Selection Register
The content of the Channel Selection Register specifies which of the channels is selected and will be the target of
subsequent 1-Wire communication commands. The DS2482-800 supports eight 1-Wire communication channels
IO0 to IO7. Only one of these channels can be active/selected at any time. Once selected, a 1-Wire channel
remains selected until a different channel is selected through the
Channel Select command
or by initiating a
device reset. After a device reset (power-up cycle or initiated by the Device Reset command) the IO0 channel is
selected.
Configuration Register
The DS2482 supports allows four 1-Wire features that are enabled or selected through the Configuration Register.
These features are:
Active Pullup (APU)
Presence Pulse Masking (PPM)
Strong Pullup (SPU)
1-Wire Speed (1WS)
These features can be selected in any combination. They apply equally to all 1-Wire channels. While APU, PPM
and 1WS maintain their state, SPU returns to its inactive state as soon as the strong pullup has ended.
Configuration Register Bit Assignment
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
1WS
SPU
PPM
APU
1WS
SPU
PPM
APU
After a device reset (power-up cycle or initiated by the Device Reset command) the Configuration Register reads
00h. When writing to the Configuration Register, the new data is accepted only if the upper nibble (bits 7 to 4) is the
one's complement of the lower nibble (bits 3 to 0). When read, the upper nibble is always 0h.
Active Pullup (APU)
The APU bit controls whether an active pullup (controlled slew-rate transistor) or a passive pullup (R
WPU
resistor)
will be used to drive a 1-Wire line from low to high. When APU = 0, active pullup is disabled (resistor mode). Active
Pullup should be selected if the 1-Wire line has a substantial length (30 meters or more) or if there is a large
number (~20 or more) of devices connected to a 1-Wire line.
The active pullup does not apply to the rising
edge of a presence pulse or a recovery after a short on the 1-Wire line.
The circuit that controls rising edges (Figure 2) operates as follows: At t1 the pulldown (from DS2482 or 1-Wire
slave) ends. From this point on the 1-Wire bus is pulled high through R
WPU
internal to the DS2482. V
CC
and the
capacitive load of the 1-Wire line determine the slope. In case that active pullup is disabled (APU = 0), the resistive
pullup continues, as represented by the solid line. With active pullup enabled (APU = 1), when at t2 the voltage has
reached a level between V
IL1max
and V
IH1min
, the DS2482 actively pulls the 1-Wire line high applying a controlled
slew rate, as represented by the dashed line. The active pullup continues until t
APUOT
is expired at t3. From that time
on the resistive pullup will continue.
Figure 2. Rising Edge Pullup
V
CC
0V
1-Wire bus is
discharged
V
IL1MAX
V
IH1MIN
t
APUOT
t
1
t
2
t
3
APU = 1
APU = 0
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS2482-100 | Single-Channel 1-Wire Master |
| DS2482S-100 | Single-Channel 1-Wire Master |
| DS2482S-800 | Eight-Channel 1-Wire Master |
| DS2502-E48 | 48-Bit Node Address Chip |
| DS26401 | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2482-800_12 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:8-Channel 1-Wire Master |
| DS2482S-100 | 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 |
| DS2482S-100/R | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Single-Channel 1-Wire Master |
| DS2482S-100/T | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Single-Channel 1-Wire Master |
| DS2482S-100/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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