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参数资料
| 型号： | DS1922E-F5# |
| 厂商： | Maxim Integrated |
| 文件页数： | 20/44页 |
| 文件大小： | 0K |
| 描述： | IBUTTON TEMP LOGGER 4KBit 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： | 5 |
| 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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DS1922E
iButton High-Temperature Logger with
8KB Data-Log Memory
alarm flags must be cleared using the Memory Clear
ETL = 1
TLFS = 0
8192
8-BIT ENTRIES
1000h
ETL = 1
TLFS = 1
4096
16-BIT ENTRIES
1000h
WITH 16-BIT FORMAT,
THE MOST SIGNIFICANT
BYTE IS STORED AT THE
LOWER ADDRESS.
command. To enable the device for a mission, the ETL
bit must be set to 1. These are general settings that
must be made in any case, regardless of the type of
object to be monitored and the duration of the mission.
If alarm signaling is desired, the temperature alarm low
and high thresholds must be defined. See the
Temperature Conversion section for how to convert a
temperature value into the binary code to be written to
2FFFh
Figure 7. Temperature Logging
2FFFh
the threshold registers. In addition, the temperature
alarm must be enabled for the low and/or high thresh-
old. This makes the device respond to a Conditional
Search command (see the 1-Wire ROM Function
Commands section), provided that an alarming condi-
tion has been encountered.
Data-Log Memory Usage
Once set up for a mission, the DS1922E logs the temper-
ature measurements at equidistant time points entry after
entry in its data-log memory. The data-log memory can
store 8192 entries in 8-bit format or 4096 entries in 16-bit
format (Figure 7). In 16-bit format, the higher 8 bits of an
entry are stored at the lower address. Knowing the start-
ing time point (Mission Timestamp) and the interval
between temperature measurements, one can recon-
struct the time and date of each measurement.
There are two alternatives to the way the DS1922E
behaves after the data-log memory is filled with data. The
user can program the device to either stop any further
recording (disable rollover) or overwrite the previously
recorded data (enable rollover), one entry at a time, start-
ing again at the beginning of the respective memory sec-
tion. The contents of the Mission Samples Counter in
conjunction with the sample rate and the Mission
Timestamp allow reconstructing the time points of all val-
ues stored in the data-log memory. This gives the exact
history over time for the most recent measurements
taken. Earlier measurements cannot be reconstructed.
Missioning
The typical task of the DS1922E is recording tempera-
ture. Before the device can perform this function, it
needs to be set up properly. This procedure is called
missioning.
First, the DS1922E must have its RTC set to a valid time
and date. This reference time can be the local time, or,
when used inside of a mobile unit, UTC (also called
GMT, Greenwich Mean Time), or any other time stan-
dard that was agreed upon. The RTC oscillator must be
running (EOSC = 1). The memory assigned to store the
mission timestamp, mission samples counter, and
20
The setting of the RO bit (rollover enable) and sample
rate depends on the duration of the mission and the
monitoring requirements. If the most recently logged
data is important, the rollover should be enabled (RO =
1). Otherwise, one should estimate the duration of the
mission in minutes and divide the number by 8192
(8-bit format) or 4096 (16-bit format) to calculate the
value of the sample rate (number of minutes between
conversions). For example, if the estimated duration of
a mission is 10 days (= 14400min), the 8192-byte
capacity of the data-log memory would be sufficient to
store a new 8-bit value every 1.8min (110s). If the
DS1922E’s data-log memory is not large enough to
store all readings, one can use several devices and set
the mission start delay to values that make the second
device start logging as soon as the memory of the first
device is full, and so on. The RO bit must be set to 0 to
disable rollover that would otherwise overwrite the
logged data.
After the RO bit and the mission start delay are set, the
sample rate must be written to the Sample Rate regis-
ter. The sample rate can be any value from 1 to 16,383,
coded as an unsigned 14-bit binary number. The
fastest sample rate is one sample per second (EHSS =
1, sample rate = 0001h) and the slowest is one sample
every 273.05hr (EHSS = 0, sample rate = 3FFFh). To
get one sample every 6min, for example, the sample
rate value must be set to 6 (EHSS = 0) or 360 decimal
(equivalent to 0168h at EHSS = 1).
If there is a risk of unauthorized access to the DS1922E
or manipulation of data, one should define passwords
for read access and full access. Before the passwords
become effective, their use must be enabled. See the
Security by Password section for more details.
Maxim Integrated
相关PDF资料 |
PDF描述 |
|---|---|
| DS1922L-F5# | IBUTTON TEMP LOGGER |
| DS1923-F5# | IBUTTON TEMP/HUMIDITY LOGGER F5 |
| DS1961S-F3# | IBUTTON EEPROM 1KBit F3 |
| DS1963S-F5+ | IBUTTON MONETARY SHA-1 |
| DS1971-F3+ | IBUTTON EEPROM 256KBIT F3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1922E-F5# | 功能描述:iButton Temp Logger Ibutton w/8Kb Datalog Mem 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 |
| DS1922F-F5# | 功能描述:iButton DS1922 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 |
| DS1922L | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Temperature Logger iButton with 8KB Data-Log Memory |
| DS1922L_11 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Temperature Logger iButton with 8KB Data-Log Memory |
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