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參數(shù)資料
| 型號： | DS1963S |
| 英文描述： | SHA iButton |
| 中文描述： | SHA iButton |
| 文件頁數(shù)： | 25/37頁 |
| 文件大小： | 349K |
| 代理商： | DS1963S |
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DS1963S
25 of 37
1-WIRE BUS SYSTEM
The 1-Wire bus is a system that has a single bus master and one or more slaves. In all instances the
DS1963S is a slave device. The bus master is typically a microcontroller or PC. For small configurations
the 1-Wire communication signals can be generated under software control using a single port pin. For
multisensor networks, the DS2480B 1-Wire line driver chip or serial port adapters based on this chip
(DS9097U series) are recommended. This simplifies the hardware design and frees the microprocessor
from responding in real-time.
The discussion of this bus system is broken down into three topics: hardware configuration, transaction
sequence, and 1-Wire signaling (signal types and timing). The 1-Wire protocol defines bus transactions in
terms of the bus state during specific time slots that are initiated on the falling edge of sync pulses from
the bus master. For a more detailed protocol description, refer to Chapter 4 of the
Book of DS19xx iButton
Standards
.
HARDWARE CONFIGURATION
The 1-Wire bus has only a single line by definition; it is important that each device on the bus be able to
drive it at the appropriate time. To facilitate this, each device attached to the 1-Wire bus must have open
drain or tri-state outputs. The 1-Wire port of the DS1963S is open-drain with an internal circuit
equivalent to that shown in Figure 9.
A multidrop bus consists of a 1-Wire bus with multiple slaves attached. At standard speed the 1-Wire bus
has a maximum data rate of 16.3kbits per second. The speed can be boosted to 142kbits per second by
activating the Overdrive mode. The DS1963S is not guaranteed to be fully compliant to the iButton
Standard. Its maximum data rate in standard speed mode is 15.4kbits per second and 125kbits per second
in Overdrive. The value of the pullup resistor primarily depends on the network size and load conditions.
For most applications the maximum value of 2.2k will be adequate.
The idle state for the 1-Wire bus is high. If for any reason a transaction needs to be suspended, the bus
must
be left in the idle state if the transaction is to resume. If this does not occur and the bus is left low
for more than 16μs (Overdrive speed) or more than 120μs (standard speed), one or more devices on the
bus may be reset. With the DS1963S the bus must be left low for no longer than 15.4μs at Overdrive
speed to ensure that none of the slave devices on the 1-Wire bus performs a reset. Despite of its limited
compliance, the DS1963S will communicate properly when used in conjunction with a DS2480B 1-Wire
driver and serial port adapters that are based on this driver chip.
HARDWARE CONFIGURATION
Figure 9
Open Drain
Port Pin
RX = RECEIVE
TX = TRANSMIT
100
MOSFET
V
PUP
RX
TX
TX
RX
DATA
SEE
TEXT
5 μA
Typ.
BUS MASTER
DS1963S 1-Wire PORT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1963S+F5 | 制造商:Maxim Integrated Products 功能描述:SHA IBTN 8SOIC - Rail/Tube |
| DS1963S-F5 | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1963S-F5+ | 功能描述:iButton SHA iButton RoHS:否 存儲類型:SRAM 存儲容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1965S-1-F3 | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1965S-1-F5 | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
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