DS1825 Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
7 of 21
Figure 4. SUPPLYING THE PARASITE-POWERED DS1825 DURING
TEMPERATURE CONVERSIONS
Figure 5. POWERING THE DS1825 WITH AN EXTERNAL SUPPLY
64-BIT LASERED ROM CODE
Each DS1825 contains a unique 64-bit code (see Figure 6) stored in ROM. The least significant 8 bits of the ROM
code contain the DS1825s 1-Wire family code: 3Bh. The next 48 bits contain a unique serial number. The most
significant 8 bits contain a cyclic redundancy check (CRC) byte that is calculated from the first 56 bits of the ROM
code. A detailed explanation of the CRC bits is provided in the CRC GENERATION section. The 64-bit ROM code
and associated ROM function control logic allow the DS1825 to operate as a 1-Wire device using the protocol
detailed in the 1-Wire BUS SYSTEM section of this data sheet.
Figure 6. 64-BIT LASERED ROM CODE
8-BIT CRC
48-BIT SERIAL NUMBER
8-BIT FAMILY CODE (3Bh)
MEMORY
The DS1825s memory is organized as shown in Figure 7. The memory consists of an SRAM scratchpad with NV
EEPROM storage for the high and low alarm trigger registers (T
H
and T
L
) and configuration register. Note that if the
DS1825 alarm function is not used, the T
H
and T
L
registers can serve as general-purpose memory. All memory
commands are described in detail in the DS1825 FUNCTION COMMANDS section.
Byte 0 and byte 1 of the scratchpad contain the LSB and the MSB of the temperature register, respectively. These
bytes are read-only. Bytes 2 and 3 provide access to T
H
and T
L
registers. Byte 4 contains the configuration register
data, which is explained in detail in the CONFIGURATION REGISTER section of this data sheet. Bytes 5, 6, and 7
are reserved for internal use by the device and cannot be overwritten.
MSB
MSB
LSB
LSB
LSB
MSB
V
PU
V
PU
4.7K
1-Wire Bus
Micro-
processor
DS1825
GND
V
DD
DQ
To Other
1-Wire Devices
V
DD
(External Supply)
DS1825
GND
V
DD
DQ
V
PU
4.7K
To Other
1-Wire Devices
1-Wire Bus
Micro-
processor
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DS1825U+TR
制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
DS1825UTR
制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
DS1830
功能描述:监控电路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
DS1830+
功能描述:监控电路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
DS1830A
功能描述:监控电路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
DS1830A+
功能描述:监控电路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
DS1830AS
功能描述:监控电路 Reset Sequencer RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
DS1830AS/T&R
制造商:Maxim Integrated Products 功能描述:3.3V RESET SEQUENCER 8P SOIC T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC SEQUENCER RESET PB 3.3V 8SOIC 制造商:Maxim Integrated Products 功能描述:Supervisory Circuits Reset Sequencer