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參數(shù)資料
| 型號(hào)： | DS1825UTR |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID |
| 中文描述： | 可編程的1 - Wire數(shù)字溫度計(jì)，具有4位ID |
| 文件頁數(shù)： | 16/21頁 |
| 文件大?。?/td> | 298K |
| 代理商： | DS1825UTR |
DS1825 Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
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1-Wire SIGNALING
The DS1825 uses a strict 1-Wire communication protocol to insure data integrity. Several signal types are defined
by this protocol: reset pulse, presence pulse, write 0, write 1, read 0, and read 1. All of these signals, with the
exception of the presence pulse, are initiated by the bus master.
INITIALIZATION PROCEDURE: RESET AND PRESENCE PULSES
All communication with the DS1825 begins with an initialization sequence that consists of a reset pulse from the
master followed by a presence pulse from the DS1825. This is illustrated in Figure 13. When the DS1825 sends the
presence pulse in response to the reset, it is indicating to the master that it is on the bus and ready to operate.
During the initialization sequence the bus master transmits (T
X
) the reset pulse by pulling the 1-Wire bus low for a
minimum of 480 s. The bus master then releases the bus and goes into receive mode (R
X
). When the bus is
released, the 5k pullup resistor pulls the 1-Wire bus high. When the DS1825 detects this rising edge, it waits 15–
60 s and then transmits a presence pulse by pulling the 1-Wire bus low for 60–240 s.
Figure 14.
INITIALIZATION TIMING
READ/WRITE TIME SLOTS
The bus master writes data to the DS1825 during write time slots and reads data from the DS1825 during read time
slots. One bit of data is transmitted over the 1-Wire bus per time slot.
WRITE TIME SLOTS
There are two types of write time slots: “Write 1” time slots and “Write 0” time slots. The bus master uses a Write 1
time slot to write a logic 1 to the DS1825 and a Write 0 time slot to write a logic 0 to the DS1825. All write time slots
must be a minimum of 60 s in duration with a minimum of a
1 s
recovery time between individual write slots. Both
types of write time slots are initiated by the master pulling the 1-Wire bus low (see Figure 14).
To generate a Write 1 time slot, after pulling the 1-Wire bus low, the bus master must release the 1-Wire bus within
15 s. When the bus is released, the 5k pullup resistor will pull the bus high. To generate a Write 0 time slot, after
pulling the 1-Wire bus low, the bus master must continue to hold the bus low for the duration of the time slot (at
least 60 s).
The DS1825 samples the 1-Wire bus during a window that lasts from 15 s to 60 s after the master initiates the
write time slot. If the bus is high during the sampling window, a 1 is written to the DS1825. If the line is low, a 0 is
written to the DS1825.
LINE TYPE LEGEND
Bus master pulling low
DS1825 pulling low
Resistor pullup
V
PU
GND
1-WIRE BUS
480 s minimum
480 s minimum
DS1825 T
presence pulse
60-240 s
MASTER T
X
RESET PULSE
MASTER R
X
DS1825
waits 15-60 s
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1830 | 功能描述:監(jiān)控電路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| DS1830+ | 功能描述:監(jiān)控電路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| DS1830A | 功能描述:監(jiān)控電路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| DS1830A+ | 功能描述:監(jiān)控電路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| DS1830AS | 功能描述:監(jiān)控電路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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