參數(shù)資料
型號(hào)： DS1986
廠商： Maxim Integrated Products, Inc.
英文描述： 64K bit Add-Only iButton(64K位只加按鈕)
中文描述： 64K位只添加iButton®
文件頁(yè)數(shù)： 22/24頁(yè)
文件大?。?/td> 164K
代理商： DS1986
DS1986
052298 22/24
erate a 16–bit CRC that is the result of clearing the CRC
generator and then shifting in the Redirection Byte only.
When writing to the DS1986 (either data memory or sta-
tus memory), the bus master receives a 16–bit CRC to
verify the correctness of the data transfer before apply-
ing the programming pulse. With the initial pass through
the Write Memory/Status flow chart the 16–bit CRC will
be generated by clearing the CRC–generator, shifting in
the command, address low, address high and the data
byte. Subsequent passes through the Write Memory/
Status flow chart due to the DS1986 automatically incre-
menting its address counter will generate an 16–bit
CRC that is the result of loading (not shifting) the new
(incremented) address into the CRC generator and then
shifting in the new data byte.
The comparison of CRC values and decision to con-
tinue with an operation are determined entirely by the
bus master. There is no circuitry on the DS1986 that pre-
vents a command sequence from proceeding if the CRC
stored in or calculated by the DS1986 does not match
the value generated by the bus master. For more details
on generating CRC values including example imple-
mentations in both hardware and software, see the
Book of DS19xx iButton Standards.
CRC–16 HARDWARE DESCRIPTION AND POLYNOMIAL
Figure 12
1ST
STAGE
2ND
STAGE
3RD
STAGE
4TH
STAGE
5TH
STAGE
6TH
STAGE
7TH
STAGE
8TH
STAGE
X
0
X
1
X
2
X
3
X
4
X
5
X
6
X
7
X
8
POLYNOMIAL = X
16
+ X
15
+ X
2
+ 1
9TH
STAGE
10TH
STAGE
11TH
STAGE
12TH
STAGE
13TH
STAGE
14TH
STAGE
15TH
STAGE
16TH
STAGE
X
9
X
10
X
11
X
12
X
13
X
14
X
15
INPUT DATA
X
16
CRC
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1986+F3 制造商:Maxim Integrated Products 功能描述:ADD-O IBTN 64KB, F3 (GENERIC) LFREE - Rail/Tube
DS19860-F3-W 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
DS1986-F3 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
DS1986-F3# 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
DS1986-F3+ 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
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