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參數(shù)資料
| 型號： | DS18B20P |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | TSOC-6 |
| 文件頁數(shù)： | 11/26頁 |
| 文件大?。?/td> | 387K |
| 代理商： | DS18B20P |
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DS18B20
19 of 26
NOTES:
1. Temperature conversion takes up to 750 ms. After receiving the Convert T protocol, if the part does
not receive power from the VDD pin, the DQ line for the DS18B20 must be held high for at least a
period greater than tconv to provide power during the conversion process. As such, no other activity
may take place on the 1-Wire bus for at least this period after a Convert T command has been issued.
2. After receiving the Copy Scratchpad protocol, if the part does not receive power from the VDD pin, the
DQ line for the DS18B20 must be held high for at least 10 ms to provide power during the copy
process. As such, no other activity may take place on the 1-Wire bus for at least this period after a
Copy Scratchpad command has been issued.
3. All three bytes must be written before a reset is issued.
READ/WRITE TIME SLOTS
DS18B20 data is read and written through the use of time slots to manipulate bits and a command word to
specify the transaction.
Write Time Slots
A write time slot is initiated when the host pulls the data line from a high logic level to a low logic level.
There are two types of write time slots: Write 1 time slots and Write 0 time slots. 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 cycles.
The DS18B20 samples the DQ line in a window of 15
s to 60 s after the DQ line falls. If the line is
high, a Write 1 occurs. If the line is low, a Write 0 occurs (see Figure 12).
For the host to generate a Write 1 time slot, the data line must be pulled to a logic low level and then
released, allowing the data line to pull up to a high level within 15
s after the start of the write time slot.
For the host to generate a Write 0 time slot, the data line must be pulled to a logic low level and remain
low for 60
s.
Read Time Slots
The host generates read time slots when data is to be read from the DS18B20. A read time slot is initiated
when the host pulls the data line from a logic high level to logic low level. The data line must remain at a
low logic level for a minimum of 1
s; output data from the DS18B20 is valid for 15 s after the falling
edge of the read time slot. The host therefore must stop driving the DQ pin low in order to read its state
15
s from the start of the read slot (see Figure 12). By the end of the read time slot, the DQ pin will pull
back high via the external pullup resistor. All read time slots must be a minimum of 60
s in duration
with a minimum of a 1-
s recovery time between individual read slots.
Figure 12 shows that the sum of TINIT, TRC, and TSAMPLE must be less than 15
s. Figure 14 shows that
system timing margin is maximized by keeping TINIT and TRC as small as possible and by locating the
master sample time towards the end of the 15-
s period.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS18B20X | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT |
| DS18B20Z | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, RECTANGULAR, SURFACE MOUNT |
| DS18B20 | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS18B20-PAR | 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-PAR/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-PAR_07 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire Parasite-Power Digital Thermometer |
| DS18B20-PAR+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 PROG-RES TO-92 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr |
| DS18B20-PAR+T&R | 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 |
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