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参数资料
| 型号： | DS1922E-F5# |
| 厂商： | Maxim Integrated |
| 文件页数： | 28/44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
Memory Access Conflicts
While a mission is in progress or while the device is
waiting for a temperature alarm to start a mission, peri-
odically a temperature sample is taken and logged.
This “internal activity” has priority over 1-Wire communi-
cation. As a consequence, device-specific commands
(excluding ROM function commands and 1-Wire reset)
do not perform properly when internal and “external”
activities interfere with each other. Not affected are the
commands Start Mission, Forced Conversion, and
Clear Memory, because they are not applicable while a
mission is in progress or while the device is waiting for
a temperature alarm. Table 3 explains how the remain-
ing five commands are affected by internal activity, how
to detect this interference, and how to work around it.
The interference is more likely to be seen with a high-
sample rate (one sample every second) and with high-
resolution logging, which can last up to 600ms. With
lower sample rates, interference may hardly be visible
at all. In any case, when writing driver software it is
important to know about the possibility of interference
and to take measures to work around it.
Table 3. Memory Access Conflicts and Solutions
COMMAND
Write Scratchpad
Read Scratchpad
Copy Scratchpad
Read Memory with
CRC
Stop Mission
28
INDICATION OF INTERFERENCE
The CRC-16 at the end of the command flow reads
FFFFh.
The data read changes to FFh bytes or all bytes
received are FFh, including the CRC at the end of
the command flow.
The device behaves as if the authorization code or
password was not valid, or as if the copy function
would not end.
The data read changes to all FFh bytes or all bytes
received are FFh, including the CRC at the end of
the command flow, despite a valid password.
The General Status register at address 0215h reads
FFh or the MIP bit is 1 while bits 0, 2, and 5 are 0.
SOLUTION
Wait 0.5s, 1-Wire reset, address the device, repeat
Write Scratchpad with the same data, and check the
validity of the CRC-16 at the end of the command
flow. Alternatively, use Read Scratchpad to verify
data integrity.
Wait 0.5s, 1-Wire reset, address the device, repeat
Read Scratchpad, and check the validity of the
CRC-16 at the end of the command flow.
Wait 0.5s, 1-Wire reset, address the device, issue
Read Scratchpad, and check the AA bit of the E/S
byte. If the AA bit is set, Copy Scratchpad was
successful.
Wait 0.5s, 1-Wire reset, address the device, repeat
Read Memory with CRC, and check the validity of
the CRC-16 at the end of the memory page.
Wait 0.5s, 1-Wire reset, address the device, and
repeat Stop Mission. Perform a 1-Wire reset, address
the device, read the General Status register at
address 0215h, and check the MIP bit. If the MIP bit
is 0, Stop Mission was successful.
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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