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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標準的EPROM) |
| 中文描述： | 1K位只添加iButton® |
| 文件頁數(shù)： | 2/21頁 |
| 文件大?。?/td> | 139K |
| 代理商： | DS1982 |
DS1982
062598 2/21
ORDERING INFORMATION
DS1982–F3
DS1982–F5
F3 MicroCan
F5 MicroCan
EXAMPLES OF ACCESSORIES
DS9096P
DS9101
DS9093RA
DS9093F
DS9092
Self–Stick Adhesive Pad
Multi–Purpose Clip
Mounting Lock Ring
Snap–In Fob
iButton Probe
iButton DESCRIPTION
The DS1982 1K–bit iButton is a rugged read/write data
carrier that identifies and stores relevant information
about the product or person to which it is attached. This
information can be accessed with minimal hardware, for
example a single port pin of a microcontroller. The
DS1982 consists of a factory–lasered registration num-
ber that includes an unique 48–bit serial number, an
8–bit CRC, and an 8–bit Family Code (09h) plus 1K–bit
of EPROM which is user–programmable. The power to
program and read the DS1982 is derived entirely from
the 1–Wire communication line. Data is transferred seri-
ally via the 1–Wire protocol which requires only a single
data lead and a ground return. The entire device can be
programmed and then write–protected if desired. Alter-
natively, the part may be programmed multiple times
with new data being appended to, but not overwriting,
existing data with each subsequent programming of the
device. Note: Individual bits can be changed only from a
logical 1 to a logical 0, never from a logical 0 to a logical
1. A provision is also included for indicating that a cer-
tain page or pages of data are no longer valid and have
been replaced with new or updated data that is now
residing at an alternate page address. This page
address redirection allows software to patch data and
enhance the flexibility of the device as a standalone
database. The 48–bit serial number that is factory–la-
sered into each DS1982 provides a guaranteed unique
identity which allows for absolute traceability. The dura-
ble MicroCan package is highly resistant to harsh envi-
ronments such as dirt, moisture, and shock. Its compact
button–shaped profile is self–aligning with cup–shaped
receptacles, allowing the DS1982 to be used easily by
human operators or automatic equipment. Accessories
permit the DS1982 to be mounted on printed circuit
boards, plastic key fobs, photo–ID badges, ID bracelets,
and many other objects. Applications include work–in–
progress tracking, electronic travelers, access control,
storage of calibration constants, and debit tokens.
OVERVIEW
The block diagram in Figure 1 shows the relationships
between the major control and memory sections of the
DS1982. The DS1982 has three main data compo-
nents: 1) 64–bit lasered ROM, 2) 1024–bit EPROM, and
3) EPROM Status Bytes. The device derives its power
for read operations entirely from the 1–Wire commu-
nication line by storing energy on an internal capacitor
during periods of time when the signal line is high and
continues to operate off of this “parasite” power source
during the low times of the 1–Wire line until it returns
high to replenish the parasite (capacitor) supply. During
programming, 1–Wire communication occurs at normal
voltage levels and then is pulsed momentarily to the pro-
gramming voltage to cause the selected EPROM bits to
be programmed. The 1–Wire line must be able to pro-
vide 12 volts and 10 milliamperes to adequately pro-
gram the EPROM portions of the part. Whenever pro-
gramming voltages are present on the 1–Wire line a
special high voltage detect circuit within the DS1982
generates an internal logic signal to indicate this condi-
tion. The hierarchical structure of the 1–Wire protocol is
shown in Figure 2. The bus master must first provide
one of the four ROM Function Commands, 1) Read
ROM, 2) Match ROM, 3) Search ROM, 4) Skip ROM.
These commands operate on the 64–bit lasered ROM
portion of each device and can singulate a specific
device if many are present on the 1–Wire line as well as
indicate to the bus master how many and what types of
devices are present. The protocol required for these
ROM Function Commands is described in Figure 9.
After a ROM Function Command is successfully
executed, the memory functions that operate on the
EPROM portions of the DS1982 become accessible
and the bus master may issue any one of the five
Memory Function Commands specific to the DS1982 to
read or program the various data fields. The protocol for
these Memory Function Commands is described in Fig-
ure 6. All data is read and written least significant bit first.
64–BIT LASERED ROM
Each DS1982 contains a unique ROM code that is 64
bits long. The first eight bits are a 1–Wire family code.
The next 48 bits are a unique serial number. The last
eight bits are a CRC of the first 56 bits. (See Figure 3).
The 64–bit ROM and ROM Function Control section
allow the DS1982 to operate as a 1–Wire device and fol-
low the 1–Wire protocol detailed in the section “1–Wire
Bus System”. The memory functions required to read
相關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 |
相關代理商/技術參數(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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