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參數(shù)資料
| 型號： | DS1205S |
| 英文描述： | MultiKey Chip |
| 中文描述： | 多密鑰芯片 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 138K |
| 代理商： | DS1205S |
DS1205S
021798 10/17
EQUIVALENT CIRCUIT
Figure 15
100 ohm
MOSFET
5
R
X
T
X
BUS MASTER OPEN DRAIN CIRCUIT
Figure 16A
5K ohms
DS5000 or 8051 equivalent
Microcontroller
Open Drain
Port Pin
To data
connection
of DS1205S
V
DD
R
X
T
X
V
DD
BUS MASTER STANDARD TTL CIRCUIT
Figure 16B
5K ohms
Port Pins
Rx
T
x
Microcontroller
TTL–Equivalent
To data
connection
of DS1205S
V
DD
Transaction Sequence
The protocol for accessing the DS1205S is as follows:
Reset
Presence Detect
1-wire Command Word
Device Command Word
Transaction/Data
CRC
Reset/Presence Detect - All transactions on the 1-wire
bus begin with the reset sequence. The reset sequence
is started by holding the data line low for 560
μ
S. The
DS1205S is designed to be held in the reset state when-
ever it is not connected to the bus. When it is connected
to the bus, the data line is pulled high, the part is taken
out of reset, and the part is ready to issue the presence
detect.
After detecting a high state on the data line, the
DS1205S waits 15
μ
S minimum and issues its presence
detect. This presence detect is a low-going pulse that
last 70
μ
S. This response to the reset pulse lets the bus
master know that the DS1205S is on the bus and is
ready to operate. The presence detect helps the bus
master to discriminate the communication signals from
noise as the DS1205S is taken on and off the bus. Refer
to the timing diagram in Figure 17.
After the DS1205S has responded to the reset pulse
with a presence detect, the bus master drives the bus to
the idle state for a minimum of 1
μ
S. The 1
μ
S interval is
like a frame sync. After each bit is transmitted on the
bus, there is a frame strobe to sync up for the next trans-
mission. Refer to Figure 17.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1205V | MultiKey |
| DS1208 | dallas semiconductor reliability report |
| DS1210 | Nonvolatile Controller Chip |
| DS1211 | Nonvolatile Controller x 8 Chip |
| DS1217M | Nonvolatile Read/Write Cartridge |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1205V | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:MultiKey |
| DS1206N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral Interface |
| DS1206S | 制造商:Maxim Integrated Products 功能描述: |
| DS1206SN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral Interface |
| DS1207 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MISC MEMORY|MODULE|5PIN|PLASTIC |
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