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參數(shù)資料
| 型號(hào)： | DS1821C+ |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 11/19頁 |
| 文件大?。?/td> | 793K |
| 描述： | IC THERMOMETER/STAT PROG 3-TO92 |
| 標(biāo)準(zhǔn)包裝： | 500 |
| 系列： | 1-Wire® |
| 功能： | 溫度計(jì)，恒溫計(jì) |
| 傳感器類型： | 內(nèi)部 |
| 感應(yīng)溫度： | -55°C ~ 125°C |
| 精確度： | ±1°C |
| 拓?fù)洌?/td> | 比較器，寄存器庫 |
| 輸出類型： | 數(shù)字 |
| 輸出警報(bào)： | 無 |
| 輸出風(fēng)扇： | 無 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -55°C ~ 125°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | TO-226-3、TO-92-3 標(biāo)準(zhǔn)主體 |
| 供應(yīng)商設(shè)備封裝： | TO-92-3 |
| 包裝： | 管件 |
DS1821
11 of 19
DS1821 FUNCTION COMMAND SET Table 4
Command
Descri tion
Protocol
1-Wire Bus Activity
After Command is Issued
TEMPERATURE CONVERSION COMMANDS
Read
Temperature
Reads last converted temperature
value from temperature register.
AAh
Master receives 8-bit temperature
value from DS1821.
Start Convert T Initiates temperature conversions.
EEh
None
Stop Convert T Halts temperature conversions.
22h
None
THERMOSTAT and STATUS/CONFIGURATION COMMANDS
Write TH
Writes data to the T
H
register.
01h
Master transmits 8-bit T
H
value to
DS1821.
Write TL
Writes data to the T
L
register.
02h
Master transmits 8-bit T
L
value to
DS1821.
Read TH
Reads data from the T
H
register.
A1h
Master receives 8-bit T
H
value from
DS1821.
Read TL
Reads data from the T
L
register.
A2h
Master receives 8-bit T
L
value from
DS1821.
Write Status
Writes data to the
status/configuration register.
0Ch
Master transmits 8-bit
status/configuration value to DS1821.
Read Status
Reads data from the
status/configuration register.
ACh
Master receives 8-bit
status/configuration value from
DS1821.
HIGH-RESOLUTION COMMANDS
Read Counter Reads data from the counter
register
A0h
Master receives 9-bit counter value
from DS1821.
Load Counter Loads slope accumulator data into
the counter register
41h
None
1-Wire SIGNALING
The DS1821 uses a strict 1-Wire communication protocol to insure data integrity. Several signal types are
defined by this protocol: reset pulse, presence pulse, write 0, write 1, read 0, and read 1. All of these
signals, with the exception of the presence pulse, are initiated by the bus master.
INITIALIZATION PROCEDURE: RESET AND PRESENCE PULSES
All communication with the DS1821 begins with an initialization sequence that consists of a reset pulse
from the master followed by a presence pulse from the DS1821. This is illustrated in Figure 7. When the
DS1821 sends the presence pulse in response to the reset, it is indicating to the master that it is on the bus
and ready to operate given an appropriate function command.
During the initialization sequence the bus master transmits (T
X
) the reset pulse by pulling the 1-Wire bus
low for a minimum of 480 祍. The bus master then releases the bus and goes into receive mode (R
X
).
When the bus is released, the 5k pullup resistor pulls the 1-Wire bus high. When the DS1821 detects this
rising edge, it waits 1560 祍 and then transmits a presence pulse by pulling the 1-Wire bus low for 60
240 祍.
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參數(shù)描述 |
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| DS1821C+ | 功能描述:恒溫器 Programmable Digital Thermo-stat/monitor RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準(zhǔn)確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產(chǎn)品:Thermostats |
| DS1821-C02 | 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 |
| DS1821-C04 | 制造商:DSC 功能描述: |
| DS1821S | 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 |
| DS1821S/T&R | 制造商:Maxim Integrated Products 功能描述:PROGRAM THERMOSTAT 208ML 8-SOIC T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER/STAT PROG 8-SOIC |
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