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(yè)數(shù)： 17/21頁(yè)
文件大?。?/td> 298K
代理商： DS1825UTR
DS1825 Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
Figure 15. READ/WRITE TIME SLOT TIMING DIAGRAM
READ TIME SLOTS
The DS1825 can only transmit data to the master when the master issues read time slots. Therefore, the master
must generate read time slots immediately after issuing a Read Scratchpad [BEh] or Read Power Supply [B4h]
command, so that the DS1825 can provide the requested data. In addition, the master can generate read time slots
after issuing Convert T [44h] or Recall E
[B8h] commands to find out the status of the operation as explained in
the DS1825 FUNCTION COMMAND section.
All read time slots must be a minimum of 60 s in duration with a minimum of a 1 s recovery time between slots. A
read time slot is initiated by the master device pulling the 1-Wire bus low for a minimum of 1 s and then releasing
the bus (see Figure 14). After the master initiates the read time slot, the DS1825 will begin transmitting a 1 or 0 on
bus. The DS1825 transmits a 1 by leaving the bus high and transmits a 0 by pulling the bus low. When transmitting
a 0, the DS1825 will release the bus by the end of the time slot, and the bus will be pulled back to its high idle state
by the pullup resister. Output data from the DS1825 is valid for 15 s after the falling edge that initiated the read
time slot. Therefore, the master must release the bus and then sample the bus state within 15 s from the start of
the slot.
17 of 21
Figure 15 illustrates that the sum of T
INIT
, T
RC
, and T
SAMPLE
must be less than 15 s for a read time slot. Figure 16
shows that system timing margin is maximized by keeping T
INIT
and T
RC
as short as possible and by locating the
master sample time during read time slots towards the end of the 15 s period.
45 s
15 s
V
PU
GND
1-WIRE BUS
60 s < T
X
“0” < 120 s
1 s < T
REC
<
DS1825
Samples
MIN TYP MAX
15 s
30 s
> 1 s
MASTER WRITE “0” SLOT
MASTER WRITE “1” SLOT
V
PU
GND
1-WIRE BUS
15 s
MASTER READ “0” SLOT
MASTER READ “1” SLOT
Master samples
Master samples
START
OF SLOT
START
OF SLOT
> 1 s
1 s < T
REC
<
15 s
15 s
30 s
15 s
DS1825
Samples
MIN TYP MAX
LINE TYPE LEGEND
Bus master pulling low
Resistor pullup
DS1825 pulling low
> 1 s
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PDF描述
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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(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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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