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參數(shù)資料
| 型號(hào)： | DS1825U |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | MICRO SOP-8 |
| 文件頁(yè)數(shù)： | 8/21頁(yè) |
| 文件大?。?/td> | 298K |
| 代理商： | DS1825U |
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DS1825 Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
Byte 8 of the scratchpad is read-only and contains the cyclic redundancy check (CRC) code for bytes 0 through 7
of the scratchpad. The DS1825 generates this CRC using the method described in the
CRC GENERATION
section.
8 of 21
Data is written to bytes 2, 3, and 4 of the scratchpad using the Write Scratchpad [4Eh] command; the data must be
transmitted to the DS1825 starting with the least significant bit of byte 2. To verify data integrity, the scratchpad can
be read (using the Read Scratchpad [BEh] command) after the data is written. When reading the scratchpad, data
is transferred over the 1-Wire bus starting with the least significant bit of byte 0. To transfer the T
H
, T
L
, and
configuration data from the scratchpad to EEPROM, the master must issue the Copy Scratchpad [48h] command.
Data in the EEPROM registers is retained when the device is powered down; at power-up the EEPROM data
(including the hard-wired address inputs AD0-AD3)is reloaded into the corresponding scratchpad locations. Data
can also be reloaded from EEPROM to the scratchpad at any time using the Recall E
2
[B8h] command. The master
can issue read time slots following the Recall E
command and the DS1825 will indicate the status of the recall by
transmitting 0 while the recall is in progress and 1 when the recall is done.
Figure 7. DS1825 MEMORY MAP
SCRATCHPAD (Power-up State)
byte 0 Temperature LSB (50h)
byte 1 Temperature MSB (05h)
byte 2 T
H
Register or User Byte 1
byte 3 T
L
Register or User Byte 2
byte 4 Configuration Register*
byte 5 Reserved
byte 6 Reserved
byte 7 Reserved
byte 8 CRC
* Lower four bits of Configuration Register
are hardwired through AD0-AD3
EEPROM
T
H
Register or User Byte 1
T
L
Register or User Byte 2
Configuration Register*
CONFIGURATION REGISTER
Byte 4 of the scratchpad memory is the configuration register, as shown in Figure 8. The configuration register
allows the user to set the conversion resolution using the R0 and R1 bits and read the programmed value of the
address pins. The conversion resolution power-up default is R0 = 1 and R1 = 1 (12-bit resolution). Table 4 shows
the resolution configuration settings and maximum conversion time. Note that there is a direct tradeoff between
resolution and conversion time. AD0-AD3 bits report the pin programmed location information and are sampled at
power-up. In Parasite Power mode, the address pins must be connected to DQ or GND and in V
DD
powered mode,
the address pins must be connected to V
DD
or GND. Pins tied to DQ/V
DD
are reported with a logical 1 and pins tied
to GND are reported as a logical 0. Pins connected to DQ/ V
DD
or GND through a resistor are valid logical 1s or
logical 0s if the resistor is less than 10k. Floating or high impedance (>10k ) connections are indeterminate. Bit 7
and Bit 4 of the configuration register are reserved for internal use and cannot be overwritten.
Figure 8. CONFIGURATION REGISTER FORMAT
Note: Bit 0 through Bit 3 are programmed through the four Location Programming Address pins AD0-AD3.
Reading the configuration register provides location information on up to 16 individual DS1825s.
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
0
R1
R0
1
AD3
AD2
AD1
AD0
(85°C)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| DS1825U+ | 功能描述:板上安裝溫度傳感器 Prog Resolution 1-Wire w/4-Bit ID 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+ | 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER 12BIT ?0.5 ?SOP-8 制造商:Maxim Integrated Products 功能描述:IC, THERMOMETER, 12BIT, 0.5C, ?SOP-8 |
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