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参数资料
| 型号： | DS1921G-F5# |
| 厂商： | Maxim Integrated |
| 文件页数： | 18/42页 |
| 文件大小： | 0K |
| 描述： | IBUTTON THERMOCHRON F5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| RoHS指令信息： | IButton RoHS Compliance Plan |
| 标准包装： | 8 |
| 系列： | iButton® |
| 存储容量： | 512B |
| 存储器类型： | NVSRAM（非易失 SRAM） |
| 产品目录页面： | 1431 (CN2011-ZH PDF) |
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DS1921G
Thermochron iButton Device
ADDRESS
0220h
0221h
0222h
0223h
0224h to 0227h
0228h to 024Fh
0250h
0251h
0252h
0253h
0254h to 0257h
0258h to 027Fh
DESCRIPTION
Mission Samples Counter, Low Byte
Mission Samples Counter, Center Byte
Mission Samples Counter, High Byte
Alarm Duration Counter
Alarm Timestamp and Duration
Alarm Timestamp and Durations
Mission Samples Counter, Low Byte
Mission Samples Counter, Center Byte
Mission Samples Counter, High Byte
Alarm Duration Counter
Alarm Timestamp and Duration
Alarm Timestamp and Durations
ALARM EVENT
Low Alarm 1
Low Alarm 2
Low Alarms 3 to 12
High Alarm 1
High Alarm 2
High Alarms 3 to 12
Figure 8. Alarm Timestamps and Durations Address Map
214h). This way, if the search conditions (address
20Eh) are set accordingly, the master can quickly iden-
tify devices with temperature alarms by means of the
conditional search function (see the ROM Function
Commands section). The device also generates a time-
stamp of when the alarm occurred and begins record-
ing the duration of the alarming temperature.
Timestamps and durations where the temperature
leaves the tolerance band are stored in the address
range 0220h to 027Fh, as shown in Figure 8. This allo-
cation allows recording 24 individual alarm events and
periods (12 periods for too hot and 12 for too cold). The
date and time of each of these periods can be deter-
mined from the Mission Timestamp register and the
time distance between each temperature reading.
The alarm timestamp is a copy of the Mission Samples
Counter register when the alarm first occurred. The
least significant byte is stored at the lower address.
One address higher than the timestamp, the DS1921G
maintains a 1-byte duration counter that stores the
number of samples the temperature was found to be
beyond the threshold. If this counter has reached its
limit after 255 consecutive temperature readings and
the temperature has not yet returned to within the toler-
ance band, the device issues another timestamp at the
next higher alarm location and opens another counter
to record the duration. If the temperature returns to
normal before the counter has reached its limit, the
18
duration counter of the particular timestamp does not
increment any further. Should the temperature again
cross this threshold, it is recorded at the next available
alarm location. This algorithm is implemented for the
low temperature thresholds as well as for the high tem-
perature threshold.
Missioning
The typical task of the DS1921G is recording the tem-
perature of a temperature-sensitive object. Before the
device can perform this function, it needs to be config-
ured. This procedure is called missioning.
First, the DS1921G must have its RTC set to a valid time
and date. This reference time can be UTC (also called
GMT, Greenwich Mean Time) or any other time stan-
dard that was chosen for the application. The clock
must be running ( EOSC = 0) for at least one second.
Setting an RTC alarm is optional. The memory assigned
to store the alarm timestamps and durations, tempera-
ture histogram, Mission Timestamp, Mission Samples
Counter, Mission Start Delay, and Sample Rate must be
cleared using the Clear Memory command. In case
there were temperature alarms in the previous mission,
the TLF and THF flags need to be cleared manually. To
enable the device for a mission, the EM flag must be
set to 0. These are general settings that have to be
made regardless of the type of object to be monitored
and the duration of the mission.
Maxim Integrated
相关PDF资料 |
PDF描述 |
|---|---|
| DS1921H-F5# | IBUTTON THERMOCHRON F5 |
| DS1921K# | KIT IBUTTON THERMOCHRON |
| DS1922E-F5# | IBUTTON TEMP LOGGER 4KBit F5 |
| DS1922L-F5# | IBUTTON TEMP LOGGER |
| DS1923-F5# | IBUTTON TEMP/HUMIDITY LOGGER F5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1921G-F5# | 功能描述:iButton Thermochron 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#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 |
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