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DS1921G
Thermochron iButton Device
Mission Timestamp Register Map
ADDRESS
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0215h
0
10 Minutes
Single Minutes
0216h
0
12/24
20 Hour
AM/PM
10 Hour
Single Hours
0217h
0
0
10 Date
Single Date
0218h
0
0
0
10 Months
Single Months
0219h
10 Years
Single Years
Mission Samples Counter Register Map
ADDRESS
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
021Ah
021Bh
021Ch
Low Byte
Center Byte
High Byte
Device Samples Counter Register Map
ADDRESS
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
021Dh
021Eh
021Fh
Mission Timestamp
The Mission Timestamp register indicates the time and
date of the first temperature conversion of a mission.
Subsequent temperature conversions take place as
many minutes apart from each other as specified by the
value in the Sample Rate register. Mission samples
occur on minute boundaries.
Mission Samples Counter
The Mission Samples Counter register indicates how
many temperature measurements have taken place
during the current mission in progress (if MIP = 1) or
during the latest mission (if MIP = 0). The value is
stored as an unsigned 24-bit integer number. This
counter is reset through the Clear Memory command.
Device Samples Counter
The Device Samples Counter register indicates how
many temperature measurements have taken place
since the device was assembled at the factory. The
value is stored as an unsigned, 24-bit integer number.
The maximum number that can be represented in this
format is 16,777,215, which is higher than the expected
lifetime of the DS1921G. This counter cannot be reset
under software control.
16
Low Byte
Center Byte
High Byte
Temperature Logging and Histogram
Once set up for a mission, the DS1921G logs the tem-
perature measurements simultaneously byte after byte
in the data-log memory as well as in histogram form in
the histogram memory. The data-log memory is able to
store 2,048 temperature values measured at equidis-
tant time points. The first temperature value of a mission
is written to address location 1000h of the data-log
memory, the second value to address location 1001h
and so on. Knowing the starting time point (Mission
Timestamp register), the interval between temperature
measurements, the Mission Samples Counter register,
and the rollover setting, one can reconstruct the time
and date of each measurement stored in the data log.
There are two alternatives to the way the DS1921G
behaves after the 2048 bytes of data-log memory is
filled with data. With rollover disabled (RO = 0), the
device fills the data-log memory with the first 2048 mis-
sion samples. Additional mission samples are not
logged in the data-log, but the histogram and tempera-
ture alarm RAM continue to update. With rollover
enabled (RO = 1), the data log wraps around and over-
writes previous data starting at 1000h for the every
2049th mission sample. In this mode, the device stores
the last 2048 mission samples.
Maxim Integrated
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相关代理商/技术参数
DS1921G-F5#W
功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A0C
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A12
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A12-W
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A14
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A15
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A17
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1921G-F5/A1B
功能描述:iButton
RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated