參數(shù)資料
型號(hào)： DS2422
英文描述： 1-Wire Temperature/Datalogger with 8kB Datalog Memory
中文描述： 1-Wire®溫度/數(shù)據(jù)記錄器，帶有8KB數(shù)據(jù)記錄存儲(chǔ)器
文件頁(yè)數(shù)： 21/48頁(yè)
文件大小： 444K
代理商： DS2422
DS2422
21 of 48
Password Control Register
ADDR
0227h
b7
b6
b5
b4
b3
b2
b1
b0
EPW
During a mission, there is only read access to this register.
To enable password checking, the EPW bits need to form a binary pattern of 10101010 (AAh). The default pattern
of EPW is different from AAh. If the EPW pattern is different from AAh, any pattern is accepted, as long as it has a
length of exactly 64 bits. Once enabled, changing the passwords and disabling password checking requires the
knowledge of the current full-access password.
Before enabling password checking, passwords for read-only access as well as for full access (read/write/control)
need to be written to the password registers. Setting up a password or enabling/disabling the password checking is
done in the same way as writing data to a memory location, only the address is different. Since they are located in
the same memory page, both passwords can be redefined at the same time.
Read Access Password Register
ADDR
0228h
0229h
—
022Eh
022Fh
b7
RP7
RP15
b6
RP6
RP14
b5
RP5
RP13
b4
RP4
RP12
—
RP52
RP60
b3
RP3
RP11
b2
RP2
RP10
b1
RP1
RP9
b0
RP0
RP8
—
RP48
RP56
RP55
RP63
RP54
RP62
RP53
RP61
RP51
RP59
RP50
RP58
RP49
RP57
There is only write access to this register. Attempting to read the password reports all zeros. The password cannot
be changed while a mission is in progress.
The Read Access Password needs to be transmitted exactly in the sequence RP0, RP1… RP62, RP63. This
password only applies to the functions “Read Memory” and “Read Memory with CRC”. The DS2422 delivers the
requested data only if the password transmitted by the master was correct or if password checking is not enabled.
Full Access Password Register
ADDR
0230h
0231h
—
0236h
0237h
b7
FP7
FP15
b6
FP6
FP14
b5
FP5
FP13
b4
FP4
FP12
—
FP52
FP60
b3
FP3
FP11
b2
FP2
FP10
b1
FP1
FP9
b0
FP0
FP8
—
FP48
FP56
FP55
FP63
FP54
FP62
FP53
FP61
FP51
FP59
FP50
FP58
FP49
FP57
There is only write access to this register. Attempting to read the password will report all zeros. The password
cannot be changed while a mission is in progress.
The Full Access Password needs to be transmitted exactly in the sequence FP0, FP1… FP62, FP63. It will affect
the functions “Read Memory”, “Read Memory with CRC”, “Copy Scratchpad”, “Clear Memory”, “Start Mission”, and
“Stop Mission”. The DS2422 executes the command only if the password transmitted by the master was correct or
if password checking is not enabled.
Due to the special behavior of the write access logic, the Password Control Register and both passwords must be
written at the same time. When setting up new passwords, always verify (read back) the scratchpad before sending
the copy scratchpad command. After a new password is successfully copied from the scratchpad to its memory
location, erase the scratchpad by filling it with new data (write scratchpad command). Otherwise a copy of the
passwords will remain in the scratchpad for public read access.
相關(guān)PDF資料
PDF描述
DS2422S 1-Wire Temperature/Datalogger with 8kB Datalog Memory
DS2482-800 Eight-Channel 1-Wire Master
DS2482-100 Single-Channel 1-Wire Master
DS2482S-100 Single-Channel 1-Wire Master
DS2482S-800 Eight-Channel 1-Wire Master
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS2422P 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Serial SRAM
DS2422S 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
DS2422S+ 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
DS2422X 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
DS2423 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:4kbit 1-Wire RAM with Counter
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