參數(shù)資料
型號(hào)： DS1922T
英文描述： Temperature Logger iButton with 8kB Datalog Memory
文件頁數(shù)： 22/48頁
文件大?。?/td> 428K
代理商： DS1922T
DS1922L/DS1922T
22 of 48
Device Configuration Byte
ADDR
0226h
0226h
0226h
b7
0
0
0
b6
0
1
1
b5
0
0
1
b4
0
0
0
b3
0
0
0
b2
0
0
0
b1
0
0
0
b0
0
0
0
DS2422
DS1922L
DS1922T
There is only read access to this register.
SECURITY BY PASSWORD
The DS1922L/T is designed to use two passwords that control read access and full access. Reading from or writing
to the scratchpad as well as the forced conversion command does not require a password. The password needs to
be transmitted right after the command code of the memory or control function. If password checking is enabled the
password transmitted is compared to the passwords stored in the device. The data pattern stored in the Password
Control register determines whether password checking is enabled.
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 will be 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 will report 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 function “Read Memory with CRC”. The DS1922L/T will deliver 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.
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參數(shù)描述
DS1922T-A1F 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
DS1922T-A1F+ 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
DS1922T-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
DS1922T-F5# 功能描述:iButton Temp Logger Ibutton w/8Kb Datalog Mem 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
DS1922T-F50 制造商:Maxim Integrated Products 功能描述:THERMOCHRON,IBTN,F5,HI-TEMP,8K - Rail/Tube
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