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参数资料
| 型号： | DS1921Z-F5# |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/45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
SAMPLE RATE
The content of the Sample Rate Register (address 020Dh) determines how many minutes the temperature
conversions are apart from each other during a mission. The sample rate may be any value from 1 to 255,
coded as an unsigned 8-bit binary number. If the memory has been cleared (Status Register bit MEMCLR
= 1) and a mission is enabled (Status Register bit EM = 0), writing a non-zero value to the Sample Rate
Register will start a mission. For a full description of the correct sequence of steps to start a temperature-
logging mission see sections Missioning or Missioning Example .
Sample Rate Register Map
ADDR
020Dh
b7
b6
b5
b4 b3
Sample Rate
b2
b1
b0
CONTROL REGISTER
The DS1921H/Z is set up for its operation by writing appropriate data to its special function registers that
are located in the register page. Several functions that are controlled by a single bit only are combined
into a single byte called Control Register (address 20Eh). This register can be read and written. If the
device is programmed for a mission, writing to the Control Register will end the mission and change the
register contents.
Control Register Bitmap
ADDR b7 b6 b5
b4
b3
b2
b1
b0
020Eh
EOSC
EMCLR
0
EM
RO
TLS
THS
TAS
The functional assignments of the individual bits are explained in the table below. Bit 5 has no function.
It always reads 0 and cannot be written to 1.
Control Register Details
BIT DESCRIPTION
EOSC: Enable Oscillator
EMCLR: Memory Clear
Enable
EM: Enable Mission
RO: Rollover
Enable/Disable
BIT(S)
b7
b6
b4
b3
DEFINITION
This bit controls the crystal oscillator of the RTC. When set to logic 0,
the oscillator will start operation. When written to logic 1, the oscillator
will stop and the device is in a low-power data retention mode. This bit
must be 0 for normal operation. The RTC must have advanced at
least 1 second before a mission start will be accepted.
This bit needs to be set to logic 1 to enable the Clear Memory function,
which is invoked as a memory function command. The Time-Stamp,
Histogram Memory as well as the Mission Time Stamp, Mission
Samples Counter, Mission Start Delay and Sample Rate will be cleared
only if the Clear Memory command is issued with the next access to
the device . The EMCLR bit will return to 0 as the next memory function
command is executed.
This bit controls whether the DS1921H/Z will begin a mission as soon as
the sample rate is written. To enable the device for a mission, this bit
must be 0.
This bit controls whether the datalog memory is overwritten with new
data or whether data logging is stopped once the memory is filled with
data during a mission. Setting this bit to a 1 enables the rollover and
data logging continues at the beginning overwriting previously collected
data. Clearing this bit to 0 disables the rollover and no further
temperature values will be stored in the datalog memory once it is filled
with data. This will not stop the mission. The device will continue
measuring temperatures and updating the histogram and alarm time
stamps and durations.
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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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