參數(shù)資料
型號(hào)： 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(jì))
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(yè)數(shù)： 10/21頁(yè)
文件大?。?/td> 150K
代理商： DS18S20
DS18S20
10 of 21
every Alarm Search cycle (i.e., Alarm Search command followed by data exchange), the bus master must
return to Step 1 (Initialization) in the transaction sequence. Refer to the OPERATION – ALARM
SIGNALING section for an explanation of alarm flag operation.
DS18S20 FUNCTION COMMANDS
After the bus master has used a ROM command to address the DS18S20 with which it wishes to
communicate, the master can issue one of the DS18S20 function commands. These commands allow the
master to write to and read from the DS18S20’s scratchpad memory, initiate temperature conversions and
determine the power supply mode. The DS18S20 function commands, which are described below, are
summarized in Table 4 and illustrated by the flowchart in Figure 15.
CONVERT T [44h]
This command initiates a single temperature conversion. Following the conversion, the resulting thermal
data is stored in the 2-byte temperature register in the scratchpad memory and the DS18S20 returns to its
low-power idle state. If the device is being used in parasite power mode, within 10
μ
s (max) after this
command is issued the master must enable a strong pullup on the 1-wire bus for the duration of the
conversion (t
conv
) as described in the POWERING THE DS18S20 section. If the DS18S20 is powered
by an external supply, the master can issue read time slots after the Convert T command and the
DS18S20 will respond by transmitting 0 while the temperature conversion is in progress and 1 when the
conversion is done. In parasite power mode this notification technique cannot be used since the bus is
pulled high by the strong pullup during the conversion.
WRITE SCRATCHPAD [4Eh]
This command allows the master to write 2 bytes of data to the DS18S20’s scratchpad. The first byte is
written into the T
H
register (byte 2 of the scratchpad), and the second byte is written into the T
L
register
(byte 3 of the scratchpad). Data must be transmitted least significant bit first. Both bytes MUST be
written before the master issues a reset, or the data may be corrupted.
READ SCRATCHPAD [BEh]
This command allows the master to read the contents of the scratchpad. The data transfer starts with the
least significant bit of byte 0 and continues through the scratchpad until the 9
th
byte (byte 8 – CRC) is
read. The master may issue a reset to terminate reading at any time if only part of the scratchpad data is
needed.
COPY SCRATCHPAD [48h]
This command copies the contents of the scratchpad T
H
and T
L
registers (bytes 2 and 3) to EEPROM. If
the device is being used in parasite power mode, within 10
μ
s (max) after this command is issued the
master must enable a strong pullup on the 1-wire bus for at least 10 ms as described in the POWERING
THE DS18S20 section.
RECALL E
2
[B8h]
This command recalls the alarm trigger values (T
H
and T
L
) from EEPROM and places the data in bytes 2
and 3, respectively, in the scratchpad memory. The master device can issue read time slots following the
Recall E
2
command and the DS18S20 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 DS18S20s on the
bus are using parasite power. During the read time slot, parasite powered DS18S20s will pull the bus
low, and externally powered DS18S20s will let the bus remain high. Refer to the POWERING THE
DS18S20 section for usage information for this command.
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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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