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)： 21/24頁(yè)
文件大?。?/td> 164K
代理商： DS1986
DS1986
052298 21/24
PROGRAM PULSE TIMING DIAGRAM
Figure 11
>5
μ
s
LINE TYPE LEGEND:
V
PULLUP
GND
V
PP
>5
μ
s
480
μ
s
NORMAL 1–Wire
COMMUNICATION ENDS
NORMAL 1–Wire
COMMUNICATION RESUMES
Bus master active high
(12V @ 10 mA)
t
RP
t
FP
t
DP
t
DV
Resistor pull–up
t
PP
CRC GENERATION
With the DS1986 there are two different types of CRCs
(Cyclic Redundancy Checks). One CRC is a 8–bit type
and is stored in the most significant byte of the 64–bit
ROM. The bus master can compute a CRC value from
the first 56 bits of the 64–bit ROM and compare it to the
value stored within the DS1986 to determine if the ROM
data has been received error–free by the bus master.
The equivalent polynomial function of this CRC is: X
8
+
X
5
+ X
4
+ 1. This 8–bit CRC is received in the true (non–
inverted) form when reading the ROM of the DS1986. It
is computed once at the factory and lasered into the
ROM.
The other CRC is a 16–bit type, generated according to
the standardized CRC16–polynomial function X
16
+ X
15
+ X
2
+ 1. This CRC is used to safeguard user–defined
EPROM data when reading data memory or status
memory. It is the same type of CRC as is used with
NVRAM based iButtons to safeguard data packets of
the iButton File Structure. In contrast to the 8–bit CRC,
the 16–bit CRC is always returned in the complemented
(inverted) form. A CRC–generator inside the DS1986
chip (Figure 12) will calculate a new 16–bit CRC at every
situation shown in the command flow chart of Figure 5.
The DS1986 provides this CRC–value to the bus mas-
ter to validate the transfer of command, address, and
data to and from the bus master. When reading the data
memory of the DS1986 with the Read Memory com-
mand, the 16–bit CRC is only transmitted as the end of
the memory is reached. This CRC is generated by clear-
ing the CRC generator, shifting in the command, low
address, high address and every data byte starting at
the first addressed memory location and continuing until
the end of the implemented data memory is reached.
When reading the status memory with the Read Status
command, the 16–bit CRC is transmitted when the end
of each 8–byte page of the status memory is reached. At
the initial pass through the Read Status flow chart the
16–bit CRC will be generated by clearing the CRC gen-
erator, shifting in the command byte, low address, high
address and the data bytes beginning at the first
addressed memory location and continuing until the last
byte of the addressed EPROM Status data page is
reached. Subsequent passes through the Read Status
flow chart will generate a 16–bit CRC that is the result of
clearing the CRC generator and then shifting in the new
data bytes starting at the first byte of the next page of the
EPROM Status data field and continuing until the last
byte of the page is reached.
When reading the data memory of the DS1986 with the
Extended Read Memory command, there are two situa-
tions where a 16–bit CRC is transmitted. One 16–bit
CRC follows each Redirection Byte, another 16–bit
CRC is received after the last byte of a memory data
page is read. The CRC at the end of the memory page is
always the result of clearing the CRC generator and
shifting in the data bytes beginning at the first addressed
memory location of the EPROM data page until the last
byte of this page. With the initial pass through the
Extended Read Memory flow chart the 16–bit CRC
value is the result of shifting the command byte into the
cleared CRC generator, followed by the two address
bytes and the Redirection Byte. Subsequent passes
through the Extended Read Memory flow chart will gen-
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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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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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