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參數(shù)資料
| 型號(hào)： | DS1922L-F5 |
| 英文描述： | Temperature Logger iButton With 8kB Datalog Memory |
| 中文描述： | 溫度記錄儀iButton的記憶與8kB的數(shù)據(jù)記錄 |
| 文件頁數(shù)： | 39/48頁 |
| 文件大?。?/td> | 428K |
| 代理商： | DS1922L-F5 |
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DS1922L/DS1922T
39 of 48
1-Wire SIGNALING
The DS1922L/T requires strict protocols to ensure data integrity. The protocol consists of four types of signaling on
one line: reset sequence with reset pulse and presence pulse, write-zero, write-one, and read-data. Except for the
presence pulse, the bus master initiates all these signals. The DS1922L/T can communicate at two different
speeds, standard speed and Overdrive speed. If not explicitly set into the Overdrive mode, the DS1922L/T will
communicate at standard speed. While in Overdrive mode the fast timing applies to all waveforms.
To get from idle to active, the voltage on the 1-Wire line needs to fall from V
PUP
below the threshold V
TL
. To get
from active to idle, the voltage needs to rise from V
ILMAX
past the threshold V
TH
. The time it takes for the voltage to
make this rise is seen in Figure 12 as ' ' and its duration depends on the pullup resistor (R
PUP
) used and the
capacitance of the 1-Wire network attached. The voltage V
ILMAX
is relevant for the DS1922L/T when determining a
logical level, not triggering any events.
The initialization sequence required to begin any communication with the DS1922L/T is shown in Figure 12. A reset
pulse followed by a presence pulse indicates the DS1922L/T is ready to receive data, given the correct ROM and
memory function command. If the bus master uses slew-rate control on the falling edge, it must pull down the line
for t
RSTL
+ t
F
to compensate for the edge. A t
RSTL
duration of 690μs or longer will exit the Overdrive mode returning
the device to standard speed. If the DS1922L/T is in Overdrive mode and t
RSTL
is no longer than 80μs the device
will remain in Overdrive mode.
Figure 12. Initialization Procedure “Reset and Presence Pulses”
RESISTOR
MASTER
DS1922L/T
t
RSTL
t
PDL
t
RSTH
t
PDH
MASTER TX “RESET PULSE”
MASTER RX “PRESENCE PULSE”
V
PUP
V
IHMASTER
V
TH
V
TL
V
ILMAX
0V
t
F
t
REC
t
MSP
After the bus master has released the line it goes into receive mode (RX). Now the 1-Wire bus is pulled to V
PUP
through the pullup resistor or, in case of a DS2480B driver, by active circuitry. When the threshold V
TH
is crossed,
the DS1922L/T waits for t
PDH
and then transmits a presence pulse by pulling the line low for t
PDL
. To detect a
presence pulse, the master must test the logical state of the 1-Wire line at t
MSP
.
The t
RSTH
window must be at least the sum of t
PDHMAX
, t
PDLMAX
, and t
RECMIN
. Immediately after t
RSTH
is expired, the
DS1922L/T is ready for data communication. In a mixed population network t
RSTH
should be extended to minimum
480μs at standard speed and 48μs at Overdrive speed to accommodate other 1-Wire devices.
READ/WRITE TIME SLOTS
Data communication with the DS1922L/T takes place in time slots, which carry a single bit each. Write time slots
transport data from bus master to slave. Read time slots transfer data from slave to master. The definitions of the
write and read time slots are illustrated in Figure 13.
All communication begins with the master pulling the data line low. As the voltage on the 1-Wire line falls below the
threshold V
TL
, the DS1922L/T starts its internal timing generator that determines when the data line is sampled
during a write time slot and how long data is valid during a read time slot.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1922L-F5# | 功能描述:iButton Temp Logger Ibutton w/8Kb Datalog Mem RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)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 |
| DS1922L-F5#A20 | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)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 |
| DS1922L-F5#A22 | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)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 |
| DS1922L-F5#W | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)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 |
| DS1922L-F5/A1E | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)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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