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參數(shù)資料
| 型號(hào)： | DS18B20 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| 封裝： | TO-92, 3 PIN |
| 文件頁數(shù)： | 8/22頁 |
| 文件大?。?/td> | 255K |
| 代理商： | DS18B20 |
DS18B20
16 of 22
The DS18B20 samples the 1-Wire bus during a window that lasts from 15
s to 60s after the master
initiates the write time slot. If the bus is high during the sampling window, a 1 is written to the DS18B20.
If the line is low, a 0 is written to the DS18B20.
Figure 14. Read/Write Time Slot Timing Diagram
READ TIME SLOTS
The DS18B20 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 DS18B20 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 DS18B20 Function Commands section.
All read time slots must be a minimum of 60
s in duration with a minimum of a 1s 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 DS18B20 will begin transmitting a 1 or 0 on bus. The DS18B20 transmits a 1 by leaving the bus high
and transmits a 0 by pulling the bus low. When transmitting a 0, the DS18B20 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
45
s
15
s
VPU
GND
1-WIRE BUS
60
s < T
X “0” < 120 s
1
s < T
REC <
∞
DS18B20 Samples
MIN
TYP
MAX
15
s
30
s
> 1
s
MASTER WRITE “0” SLOT
MASTER WRITE “1” SLOT
VPU
GND
1-WIRE BUS
15
s
MASTER READ “0” SLOT
MASTER READ “1” SLOT
Master samples
START
OF SLOT
START
OF SLOT
> 1
s
1
s < T
REC <
∞
15
s
15
s
30
s
15
s
DS18B20 Samples
MIN
TYP
MAX
LINE TYPE LEGEND
Bus master pulling low
DS18B20 pulling low
Resistor pullup
> 1
s
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS18B20U+T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, SQUARE, SURFACE MOUNT |
| DS18B20-SL+T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| DS18B20/T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| DS18B20U | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, SQUARE, SURFACE MOUNT |
| DS18B20U/T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, SQUARE, SURFACE MOUNT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS18B20/GG8 | 制造商:Maxim Integrated Products 功能描述:PROGRAMMABLE RESOLUTION 1-WIRE DIGITAL THERMOMETER - Rail/Tube |
| DS18B20/T&R | 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN PROG-RES TO-92 |
| DS18B20/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 |
| DS18B20_07 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Programmable Resolution 1-Wire Digital Thermometer |
| DS18B20_08 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire Digital Thermometer |
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