DS1982U-F5-1181+ [MAXIM]
EEPROM;
| 型号： | DS1982U-F5-1181+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | EEPROM 可编程只读存储器 电动程控只读存储器 电可擦编程只读存储器 |
| 文件： | 总4页 (文件大小：61K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-5070; Rev 12/09
DS1982U/DS1985U
UniqueWare™ iButton®
SPECIAL FEATURES
. 1024 bits or 16Kb Electrically Programmable
Read Only Memory (EPROM)
COMMON iButton FEATURES
. Multidrop controller for 1-Wire network
. Digital identification and information by
momentary contact
. Chip-based data carrier compactly stores
information
. Data can be accessed while affixed to object
. Economically communicates to bus master
with a single digital signal at 16.3kbps
. Standard 16mm diameter and 1-Wire®
protocol ensure compatibility with iButton®
family
. Button shape is self-aligning with cup-
shaped probes
. Durable stainless steel case engraved with
registration number withstands harsh
environments
. Easily affixed with self-stick adhesive
backing, latched by its flange, or locked with
a ring pressed onto its rim
. Presence detector acknowledges when reader
first applies voltage
communicates with the economy of one
signal plus ground
. Unique, factory lasered and tested 64-bit
registration number (8-bit family code, 3-bit
serialization, 12-bit UniqueWare Identifier
5E7h, 8-bit CRC tester) assures absolute
traceability because no two parts are alike
. EPROM partitioned into 256-bit pages for
randomly accessing packetized data records
. Each memory page can be permanently
write-protected to prevent tampering
. Device is an “add only” memory where
additional data can be programmed into
EPROM without disturbing existing data
. Reduces control, address, data, power and
programming signals to a single pin
. 8-bit family code specifies device
communications requirements to reader
. Presence detector acknowledges when reader
first applies voltage
. Meets UL#913 (4th edit.); Intrinsically Safe
Apparatus, Approved under Entity Concept
for use in Class I, Division 1, Group A, B, C
and D Locations (application pending)
. Reads over a wide voltage range of 2.8V to
6.0V from -40°C to +85°C
DESCRIPTION
UniqueWare iButtons are factory-programmed versions of the DS1982 (1024 bit) and the DS1985 (16Kb)
Add-Only iButtons, respectively. They differ from the regular devices in their custom ROM family codes
(see the Ordering Information) and the UniqueWare Identifier 5E7h in place of the upper 12 bits of the
standard serialization field. For technical details on the devices, refer to the DS1982 and DS1985 data
sheets.
UniqueWare Add-Only iButtons are only available preprogrammed with customer-specific and write-
protected data. UniqueWare data fills at least one but no more than the first two pages of a device,
depending on the length of the customer-supplied data.
UniqueWare devices are only available to existing customers. New data patterns are no longer accepted.
The minimum order quantity (MOQ) is 34,000 pieces with higher quantities available in multiples of
17,000 pieces. UniqueWare iButtons can only be purchased in bulk form, delivered in bags. The shipment
quantity can be plus or minus 10% of the order quantity. Only the quantity shipped will be billed.
UniqueWare is a trademark of Maxim Integrated Products, Inc.
iButton and 1-Wire are registered trademarks of Maxim Integrated Products, Inc.
1 of 4
DS1982U/DS1985U
Sample UniqueWare Data Structures
SAMPLE 1: ETHERNET NODE ADDRESS Figure 1a
CRC16
MSB LSB MSB
2 bytes 3 bytes constant
assigned by IEEE
Company ID Value Extension ID Value
LSB MSB LSB MSB
3 bytes serialization 4 bytes
Project ID
(unused)
Length
LSB
19 bytes
FFh
1 byte
0Ah
constant
high address
low address
PHYSICAL ADDRESS AND DATA MAPPING Figure 1b
0C
xx
0B
xx
0A
ch
09
08
cl
07
hh
06
05
ll
04
00
03
00
02
pp
01
pp
00
0A
Address
Data
cm
mm
xx xx = inverted CRC16, value depends on actual data
ch cm cl = high, medium and low byte of the IEEE assigned “Company ID”
hh mm ll = high, medium and low byte of the “Extension ID” or serialization
pp pp = Project ID assigned by Maxim
SAMPLE 2: EUI-64 FireWire® NODE ADDRESS Figure 2a
CRC16
MSB LSB MSB
2 bytes 3 bytes constant
assigned by IEEE
Company ID Value Extension ID Value
LSB MSB LSB MSB
5 bytes serialization
Project ID
LSB
4 bytes
(unused)
Length
17 bytes
FFh
1 byte
0Ch
constant
high address
low address
PHYSICAL ADDRESS AND DATA MAPPING Figure 2b
0E 0D 0C 0B 0A 09
08
07
06
05
ll
04
00
03
00
02
pp
01
pp
00
0C
Address
Data
xx xx ch cm cl hh hm mm ml
xx xx = inverted CRC16, value depends on actual data
ch cm cl = high, medium and low byte of the IEEE assigned “Company ID”
hh hm mm ml ll = high, medium and low byte of the “Extension ID” or serialization
pp pp = Project ID assigned by Maxim
The examples shown here use the Default Data Structure. This format is also known as UDP (universal
data packet) and is commonly used in 1-Wire APIs. Therefore, if using one of those APIs one can call a
high level function to read and verify the inverted CRC16. The UDP is defined in Application Note 114:
1-Wire File Structure, and the APIs can be found in the 1-Wire Software Development Kits.
FireWire is a registered trademark of Apple Computer, Inc.
2 of 4
DS1982U/DS1985U
ORDERING INFORMATION
ORDERING PART
NUMBER
MEMORY SIZE
FAMILY CODE
PACKAGE
1024 bits
(4 pages)
16Kb
F3 MicroCan
F5 MicroCan
F3 MicroCan
F5 MicroCan
DS1982U-F3-pppp+
DS1982U-F5-pppp+
DS1985U-F3-pppp+
DS1985U-F5-pppp+
89h
8Bh
(64 pages)
pppp stands for the Project ID assigned to each individual data pattern at the time of the first order.
+Denotes a lead(Pb)-free/RoHS-compliant package.
3 of 4
DS1982U/DS1985U
REVISION HISTORY
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
Changed the Ordering Information to lead(Pb)-free.
3
Removed the DS1986U.
1, 2, 3
Removed instructions on how to set up a UniqueWare project (no new projects).
Added MOQ and shipment quantity information.
Emphasized that the 16-bit CRC is inverted.
1
12/09
1
1
2
Included an explanation of “Default Data Structure.”
Changed notation of hexadecimal numbers from H to h.
1, 2, 3
4 of 4
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim
reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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