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参数资料
型号： DS1923-F5#
厂商： Maxim Integrated
文件页数： 25/55页
文件大小： 0K
描述： IBUTTON TEMP/HUMIDITY LOGGER 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)
DS1923
iButton Hygrochron Temperature/Humidity
Logger with 8KB Data-Log Memory
Read-Access Password Register Bitmap
ADDRESS
0228h
0229h
BIT 7
RP7
RP15
BIT 6
RP6
RP14
BIT 5
RP5
RP13
BIT 4
RP4
RP12
BIT 3
RP3
RP11
BIT 2
RP2
RP10
BIT 1
RP1
RP9
BIT 0
RP0
RP8
…
…
022Eh
022Fh
RP55
RP63
RP54
RP62
RP53
RP61
RP52
RP60
RP51
RP59
RP50
RP58
RP49
RP57
RP48
RP56
Note: 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.
Full-Access Password Register Bitmap
ADDRESS
0230h
0231h
BIT 7
FP7
FP15
BIT 6
FP6
FP14
BIT 5
FP5
FP13
BIT 4
FP4
FP12
BIT 3
FP3
FP11
BIT 2
FP2
FP10
BIT 1
FP1
FP9
BIT 0
FP0
FP8
…
…
0236h
0237h
FP55
FP63
FP54
FP62
FP53
FP61
FP52
FP60
FP51
FP59
FP50
FP58
FP49
FP57
FP48
FP56
Note: 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.
Before enabling password checking, passwords for
read-only access as well as for full access
(read/write/control) must be written to the password
registers. Setting up a password or enabling/dis-
abling 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 rede-
fined at the same time.
The Read Access Password must be transmitted exact-
ly in the sequence RP0, RP1…RP62, RP63. This pass-
word only applies to the Read Memory with CRC
command. The DS1923 delivers the requested data
only if the password transmitted by the master was cor-
rect or if password checking is not enabled.
Maxim Integrated
The Full Access Password must be transmitted exactly
in the sequence FP0, FP1…FP62, FP63. It affects the
commands Read Memory with CRC, Copy Scratchpad,
Clear Memory, Start Mission, and Stop Mission. The
DS1923 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 scratch-
pad to its memory location, erase the scratchpad by fill-
ing it with new data (Write Scratchpad command).
Otherwise, a copy of the passwords remains in the
scratchpad for public read access.
25
相关PDF资料
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