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參數(shù)資料
| 型號： | DS1822Z/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), 2Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | SO-8 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 222K |
| 代理商： | DS1822Z/T&R |
DS1822
2 of 21
ORDER INFORMATION
ORDERING
NUMBER
PACKAGE
MARKING
DESCRIPTION
DS1822
1822
DS1822 in 3-pin TO92
DS1822/T&R
1822
DS1822 in 3-pin TO92, 2000 Piece Tape-and-Reel
DS1822+
1822 (See Note)
DS1822 in Lead-Free 3-pin TO92
DS1822+T&R
1822 (See Note)
DS1822 in Lead-Free 3-pin TO92, 2000 Piece Tape-and-
Reel
DS1822Z
DS1822
DS1822 in 150 mil 8-pin SO
DS1822Z/T&R
DS1822
DS1822 in 150 mil 8-pin SO, 2500 Piece Tape-and-Reel
DS1822Z+
DS1822 (See Note)
DS1822 in Lead-Free 150 mil 8-pin SO
DS1822Z+T&R
DS1822 (See Note)
DS1822 in Lead-Free 150 mil 8-pin SO, 2500 Piece
Tape-and-Reel
Note: A “+” symbol will also be marked on the package.
DETAILED PIN DESCRIPTIONS Table 1
8-PIN SO*
TO-92 SYMBOL DESCRIPTION
5
1
GND
Ground.
4
2
DQ
Data Input/Output pin. Open-drain 1-Wire interface pin. Also
provides power to the device when used in parasite power mode
(see “Parasite Power” section).
3
VDD
Optional VDD pin. VDD must be grounded for operation in
parasite power mode.
*All pins not specified in this table are “No Connect” pins.
OVERVIEW
Figure 1 shows a block diagram of the DS1822, and pin descriptions are given in Table 1. The 64-bit
ROM stores the device’s unique serial code. The scratchpad memory contains the 2-byte temperature
register that stores the digital output from the temperature sensor. In addition, the scratchpad provides
access to the 1-byte upper and lower alarm trigger registers (TH and TL), and the 1-byte configuration
register. The configuration register allows the user to set the resolution of the temperature-to-digital
conversion to 9, 10, 11, or 12 bits. The TH, TL and configuration registers are NV (EEPROM), so they will
retain data when the device is powered down.
The DS1822 uses Dallas’ exclusive 1-Wire bus protocol that implements bus communication using one
control signal. The control line requires a weak pullup resistor since all devices are linked to the bus via a
3-state or open-drain port (the DQ pin in the case of the DS1822). In this bus system, the microprocessor
(the master device) identifies and addresses devices on the bus using each device’s unique 64-bit code.
Because each device has a unique code, the number of devices that can be addressed on one bus is
virtually unlimited. The 1-Wire bus protocol, including detailed explanations of the commands and “time
slots,” is covered in the 1-WIRE BUS SYSTEM section of this data sheet.
Another feature of the DS1822 is the ability to operate without an external power supply. Power is instead
supplied through the 1-Wire pullup resistor via the DQ pin when the bus is high. The high bus signal also
charges an internal capacitor (CPP), which then supplies power to the device when the bus is low. This
method of deriving power from the 1-Wire bus is referred to as “parasite power.” As an alternative, the
DS1822 may also be powered by an external supply on VDD.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1822/T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| DS1822 | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| DS1822+T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| DS1822Z | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT |
| DS18B20-PAR/T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, ROUND, THROUGH HOLE MOUNT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1825 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID |
| DS1825U | 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 |
| DS1825U/T&R | 制造商:Maxim Integrated Products 功能描述:1-W PROGRAMMABLE DGT THERM 8P USOP - Tape and Reel |
| DS1825U/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 |
| DS1825U/TR | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID |
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