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參數(shù)資料
| 型號： | DS18S20 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | High Precision 1-Wire Digital Thermometer(高精度1線數(shù)字溫度計) |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), 0.50Cel, ROUND, THROUGH HOLE MOUNT |
| 封裝： | TO-92, 3 PIN |
| 文件頁數(shù)： | 13/21頁 |
| 文件大?。?/td> | 150K |
| 代理商： | DS18S20 |
DS18S20
13 of 21
READ TIME SLOTS
The DS18S20 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 DS18S20 can provide the requested data. In addition, the master can
generate read time slots after issuing Convert T [44h] or Recall E
2
[B8h] commands to find out the status
of the operation as explained in the DS18S20 FUNCTION COMMAND section.
All read time slots must be a minimum of 60
μ
s in duration with a minimum of a 1
μ
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
μ
s and then releasing the bus (see Figure 11). After the master initiates the read time slot,
the DS18S20 will begin transmitting a 1 or 0 on bus. The DS18S20 transmits a 1 by leaving the bus high
and transmits a 0 by pulling the bus low. When transmitting a 0, the DS18S20 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 DS18S20 is valid for 15
μ
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
μ
s from the start of the slot.
Figure 12 illustrates that the sum of T
INIT
, T
RC
, and T
SAMPLE
must be less than 15
μ
s for a read time slot.
Figure 13 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
μ
s period.
READ/WRITE TIME SLOT TIMING DIAGRAM
Figure 11
45
μ
s
15
μ
s
V
PU
GND
1-WIRE BUS
60
μ
s < T
X
“0” < 120
1
μ
s < T
REC
<
∞
DS18S20
Samples
MIN TYP MAX
15
μ
s
30
μ
s
> 1
μ
s
MASTER WRITE “0” SLOT
MASTER WRITE “1” SLOT
V
PU
GND
1-WIRE BUS
15
μ
s
MASTER READ “0” SLOT
MASTER READ “1” SLOT
1
μ
s < T
REC
<
∞
Master samples
Master samples
START
OF SLOT
START
OF SLOT
> 1
μ
s
15
μ
s
15
μ
s
30
μ
s
15
μ
s
DS18S20
Samples
MIN TYP MAX
> 1
μ
s
LINE TYPE LEGEND
Bus master pulling low
Resistor pullup
DS18S20 pulling low
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS18S20/T&R | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN HI PREC TO-92 |
| DS18S20/T&R | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| DS18S20+ | 功能描述:板上安裝溫度傳感器 Prgmble Resolution 1-Wire Parasite Pwr RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| DS18S20+PAR | 功能描述:板上安裝溫度傳感器 Prgmble Resolution 1-Wire Parasite Pwr RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| DS18S20+T&R | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 1-WIRE 3PIN TO-92 - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN HI-PREC TO-92 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr |
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