參數(shù)資料
型號(hào)： DS1921
英文描述： High-Resolution Thermochron iButton
中文描述： 高分辨率Thermochron iButton的
文件頁(yè)數(shù)： 9/44頁(yè)
文件大?。?/td> 271K
代理商： DS1921
DS1921H/Z
9 of 44
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
Sample Rate
b3
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
020Eh
EOSC
b6
b5
0
b4
EM
b3
RO
b2
TLS
b1
THS
b0
TAS
EMCLR
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
BIT(S)
b7
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 temperature logging 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 temperature logging
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.
EMCLR: Memory Clear
Enable
b6
EM: Enable Mission
b4
RO: Rollover
Enable/Disable
b3
相關(guān)PDF資料
PDF描述
DS1921H-F5 High-Resolution Thermochron iButton
DS1921Z-F5 High-Resolution Thermochron iButton
DS1963L-F5 NVRAM (Battery Based)
DS1963S SHA iButton
DS1971 256-Bit EEPROM iButton
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1921G 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Thermochron iButton
DS1921G_11 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Logs Up to 2048 Consecutive Temperature Thermochron iButton
DS1921G_1109 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Thermochron iButton
DS1921G_12 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Thermochron iButton
DS1921G-F5 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*