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参数资料
| 型号： | DS1921Z-F5# |
| 厂商： | Maxim Integrated |
| 文件页数： | 2/45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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DS1921H/Z
iButton DEVICE DESCRIPTION
The DS1921H/Z Thermochron? iButton devices are rugged, self-sufficient systems that measure
temperature and record the result in a protected memory section. The recording is done at a user-defined
rate, both as a direct storage of temperature values as well as in the form of a histogram. Up to 2048
temperature values taken at equidistant intervals ranging from 1 to 255 minutes can be stored. The
histogram provides 64 data bins with a resolution of 0.5°C. If the temperature leaves a user-
programmable range, the DS1921H/Z will also record when this happened, for how long the temperature
stayed outside the permitted range, and if the temperature was too high or too low. Additional 512 bytes
of general-purpose battery-backed SRAM allow storing information pertaining to the object to which the
DS1921H/Z is associated. Data is transferred serially via the 1-Wire protocol, which requires only a
single data lead and a ground return. Every DS1921H/Z is factory-lasered with a guaranteed unique
electrically readable 64-bit registration number that allows for absolute traceability. The durable stainless
steel package is highly resistant to environmental hazards such as dirt, moisture, and shock. Accessories
permit the DS1921H/Z to be mounted on almost any object, including containers, pallets, and bags.
APPLICATION
The DS1921Z is an ideal device to monitor the temperature of any object it is attached to or shipped with,
such as fresh produce, medical drugs and supplies. It is also ideal for use in refrigerators. The DS1921H
is intended for monitoring the body temperature of humans and animals and for monitoring temperature
critical processes such as curing, powder coating, and painting. Alternatively, the DS1921H can be used
for monitoring the temperature of clean rooms, and computer and equipment rooms. It can also aid in
calculating the proportional share of heating cost of each party in buildings with central heating. The
DS1921H has a fixed range of +15 ° C to +46°C. The DS1921Z has a fixed range of -5 ° C to +26°C. The
high resolution makes the DS1921H and DS1921Z suitable for scientific research and development. The
general-purpose battery-backed SRAM can store information such as shipping manifests, dates of
manufacture, or other relevant data written as ASCII or encrypted files. Note that the initial sealing level
of DS1921H/Z achieves the equivalent of IP56. Aging and use conditions can degrade the integrity of the
seal over time, so for applications with significant exposure to liquids, sprays, or other similar
environments, it is recommended to place the Thermochron in the DS9107 iButton capsule. The DS9107
provides a watertight enclosure that has been rated to IP68 (refer to Application Note 4126).
OVERVIEW
The block diagram in Figure 1 shows the relationships between the major control and memory sections of
the DS1921H/Z. The device has seven main data components: 1) 64-bit lasered ROM; 2) 256-bit
scratchpad; 3) 4096-bit general-purpose SRAM; 4) 256-bit register page of timekeeping, control, and
counter registers; 5) 96 bytes of alarm time stamp and duration logging memory; 6) 128 bytes of
histogram memory; and 7) 2048 bytes of datalog memory. Except for the ROM and the scratchpad, all
other memory is arranged in a single linear address space. All memory reserved for logging purposes,
counter registers and several other registers are read-only for the user. The timekeeping and control
registers are write-protected while the device is programmed for a mission.
The hierarchical structure of the 1-Wire protocol is shown in Figure 2. The bus master must first provide
one of the seven ROM function commands: 1) Read ROM; 2) Match ROM; 3) Search ROM; 4)
Conditional Search ROM; 5) Skip ROM; 6) Overdrive-Skip ROM; or 7) Overdrive-Match ROM. Upon
completion of an Overdrive ROM command byte executed at standard speed, the device will enter
Overdrive mode, where all subsequent communication occurs at a higher speed. The protocol required for
these ROM function commands is described in Figure 13. After a ROM function command is
successfully executed, the memory functions become accessible and the master may provide any one of
the seven available commands. The protocol for these memory function commands is described in Figure
10. All data is read and written least significant bit first.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1921Z-F5# | 功能描述:iButton Thermochron High Res 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 |
| DS1921Z-F5/A1D | 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 |
| DS1921Z-F5+A1D | 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 |
| DS1921Z-F50 | 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 |
| DS1922E | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:High-Temperature Logger iButton with 8KB |
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