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參數(shù)資料
| 型號： | DS1982 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | UniqueWare iButton(UniqueWare iButton標(biāo)準(zhǔn)的EPROM) |
| 中文描述： | 1K位只添加iButton® |
| 文件頁數(shù)： | 17/21頁 |
| 文件大?。?/td> | 139K |
| 代理商： | DS1982 |
DS1982
062598 17/21
for the Read Memory, Read Status, and Read Data/
Generate 8–Bit CRC commands to confirm that these
bytes have been received correctly. The CRC generator
on the DS1982 is also used to provide verification of
error–free data transfer as each page of data from the
1024–bit EPROM is sent to the bus master during a
Read Data/Generate 8–Bit CRC command, and for the
eight bytes of information in the status memory field.
In each case where a CRC is used for data transfer val-
idation, the bus master must calculate a CRC value
using the polynomial function given above and compare
the calculated value to either the 8–bit CRC value stored
in the 64–bit ROM portion of the DS1982 (for ROM
reads) or the 8–bit CRC value computed within the
DS1982. The comparison of CRC values and decision
to continue with an operation are determined entirely by
the bus master. There is no circuitry on the DS1982 that
prevents a command sequence from proceeding if the
CRC stored in or calculated by the DS1982 does not
match the value generated by the bus master. Proper
use of the CRC as outlined in the flow chart of Figure 6
can result in a communication channel with a very high
level of integrity. For more details on generating CRC
values including example implementations in both hard-
ware and software, see the Book of DS19xx iButton
Standards.
INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES”
Figure 10
t
RSTH
t
RSTL
t
R
V
PULLUP
V
PULLUP MIN
IH MIN
V
IL MAX
0V
480
μ
s < t
RSTL
<
480
μ
s < t
RSTH
<
15
μ
s < t
PDH
< 60
μ
s
60
μ
s < t
PDL
< 240
μ
s
*
(includes recovery time)
t
PDH
t
PDL
RESISTOR
MASTER
DS1982
MASTER R
X
“PRESENCE PULSE”
MASTER T
X
“RESET PULSE”
* In order not to mask interrupt signaling by other devices on the 1–Wire bus, t
RSTL
+ t
R
should always be less than
960
μ
s.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1985 | UniqueWare iButton(唯一貨品按鈕) |
| DS1986U | UniqueWare iButton(唯一貨品按鈕) |
| DS1986 | 64K bit Add-Only iButton(64K位只加按鈕) |
| DS2045W | 3.3V Single-Piece 1Mb Nonvolatile SRAM |
| DS2045W-100 | 3.3V Single-Piece 1Mb Nonvolatile SRAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1982+F3 | 制造商:Maxim Integrated Products 功能描述:1KB ADD-ONLY IBTN 2PIN F3 MICROCAN - Rail/Tube |
| DS1982+F5 | 制造商:Maxim Integrated Products 功能描述:1KB ADD-ONLY IBTN 2PIN F5 MICROCAN - Rail/Tube 制造商:Maxim Integrated Products 功能描述:IC MEMORY I BUTTON 1982 |
| DS1982-F3 | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量: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 |
| DS1982-F3# | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量: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 |
| DS1982-F3+ | 功能描述:iButton 1Kb Add-Only iButton RoHS:否 存儲類型:SRAM 存儲容量: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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