參數(shù)資料
型號(hào)： DS18B20U+T&R
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, SQUARE, SURFACE MOUNT
封裝： LEAD FREE, USOP-8
文件頁(yè)數(shù)： 4/22頁(yè)
文件大?。?/td> 255K
代理商： DS18B20U+T&R
DS18B20
12 of 22
COPY SCRATCHPAD [48h]
This command copies the contents of the scratchpad TH, TL and configuration registers (bytes 2, 3 and 4)
to EEPROM. If the device is being used in parasite power mode, within 10
s (max) after this command is
issued the master must enable a strong pullup on the 1-Wire bus for at least 10ms as described in the
Powering the DS18B20 section.
RECALL E
2 [B8h]
This command recalls the alarm trigger values (TH and TL) and configuration data from EEPROM and
places the data in bytes 2, 3, and 4, respectively, in the scratchpad memory. The master device can issue
read time slots following the Recall E
2 command and the DS18B20 will indicate the status of the recall by
transmitting 0 while the recall is in progress and 1 when the recall is done. The recall operation happens
automatically at power-up, so valid data is available in the scratchpad as soon as power is applied to the
device.
READ POWER SUPPLY [B4h]
The master device issues this command followed by a read time slot to determine if any DS18B20s on the
bus are using parasite power. During the read time slot, parasite powered DS18B20s will pull the bus
low, and externally powered DS18B20s will let the bus remain high. See the Powering the DS18B20
section for usage information for this command.
Table 3. DS18B20 Function Command Set
COMMAND
DESCRIPTION
PROTOCOL
1-Wire BUS
ACTIVITYAFTER
COMMAND IS ISSUED
NOTES
TEMPERATURE CONVERSION COMMANDS
Convert T
Initiates temperature
conversion.
44h
DS18B20 transmits
conversion status to master
(not applicable for parasite-
powered DS18B20s).
1
MEMORY COMMANDS
Read
Scratchpad
Reads the entire scratchpad
including the CRC byte.
BEh
DS18B20 transmits up to 9
data bytes to master.
2
Write
Scratchpad
Writes data into scratchpad
bytes 2, 3, and 4 (TH, TL,
and configuration
registers).
4Eh
Master transmits 3 data bytes
to DS18B20.
3
Copy
Scratchpad
Copies TH, TL, and
configuration register data
from the scratchpad to
EEPROM.
48h
None
1
Recall E
2
Recalls TH, TL, and
configuration register data
from EEPROM to the
scratchpad.
B8h
DS18B20 transmits recall
status to master.
Read Power
Supply
Signals DS18B20 power
supply mode to the master.
B4h
DS18B20 transmits supply
status to master.
Note 1:
For parasite-powered DS18B20s, the master must enable a strong pullup on the 1-Wire bus during temperature
conversions and copies from the scratchpad to EEPROM. No other bus activity may take place during this time.
Note 2:
The master can interrupt the transmission of data at any time by issuing a reset.
Note 3:
All three bytes must be written before a reset is issued.
相關(guān)PDF資料
PDF描述
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
DS18S20-PAR/T&R DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), 0.50Cel, ROUND, THROUGH HOLE MOUNT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS18B20-W 制造商:Maxim Integrated Products 功能描述:
DS18B20X 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
DS18B20X/T&R 制造商:Maxim Integrated Products 功能描述:THE MAXIM DS18B20X/T&R IS A TEMPERATURE SENSOR. - Tape and Reel 制造商:Maxim Integrated Products 功能描述:Maxim DS18B20X/T&R, Digital Thermometer 9bit-to-12bit -55C to +125C 3V-5.5V
DS18B20X/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
DS18B20Z 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
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