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1024-Bit EEPROM iButton
Detailed Description
The DS1972 combines 1024 bits of EEPROM, an
8-byte register/control page with up to 7 user read/write
bytes, and a fully featured 1-Wire interface in a rugged
iButton package. Each DS1972 has its own 64-bit ROM
registration number that is factory lasered into the chip
to provide a guaranteed unique identity for absolute
PARASITE POWER
traceability. Data is transferred serially through the 1-
Wire protocol, which requires only a single data contact
IO
1-Wire
FUNCTION CONTROL
64-BIT
LASERED ROM
and a ground return. The DS1972 has an additional
memory area called the scratchpad that acts as a
buffer when writing to the main memory or the register
page. Data is first written to the scratchpad from which
it can be read back. After the data has been verified, a
Copy Scratchpad command transfers the data to its
final memory location. Applications of the DS1972
include access control/parking meter, work-in-progress
MEMORY
FUNCTION
CONTROL UNIT
CRC-16
GENERATOR
DS1972
tracking, tool management, inventory control, and
maintenance/inspection data storage. Free software for
communication with the DS1972 is available at
www.maxim-ic.com/ibutton .
Overview
The block diagram in Figure 1 shows the relationships
between the major control and memory sections of the
DS1972. The DS1972 has four main data components:
64-bit lasered ROM, 64-bit scratchpad, four 32-byte
pages of EEPROM, and a 64-bit register page.
DATA MEMORY
4 PAGES OF
256 BITS EACH
REGISTER PAGE
64 BITS
Figure 1. Block Diagram
64-BIT
SCRATCHPAD
The hierarchical structure of the 1-Wire protocol is
shown in Figure 2. The bus master must first provide
one of the seven ROM function commands: Read
ROM, Match ROM, Search ROM, Skip ROM, Resume,
Overdrive-Skip ROM, or Overdrive-Match ROM. Upon
completion of an Overdrive-Skip ROM or Overdrive-
Match ROM command byte executed at standard
speed, the device enters overdrive mode where all
subsequent communication occurs at a higher
speed. The protocol required for these ROM function
AVAILABLE COMMANDS:
DATA FIELD AFFECTED:
DS1972 COMMAND LEVEL:
1-Wire ROM FUNCTION COMMANDS
(SEE FIGURE 9)
DS1972-SPECIFIC
MEMORY FUNCTION COMMANDS
(SEE FIGURE 7)
Figure 2. Hierarchical Structure for 1-Wire Protocol
READ ROM
MATCH ROM
SEARCH ROM
SKIP ROM
RESUME
OVERDRIVE-SKIP ROM
OVERDRIVE-MATCH ROM
WRITE SCRATCHPAD
READ SCRATCHPAD
COPY SCRATCHPAD
READ MEMORY
64-BIT REG. #, RC-FLAG
64-BIT REG. #, RC-FLAG
64-BIT REG. #, RC-FLAG
RC-FLAG
RC-FLAG
RC-FLAG, OD-FLAG
64-BIT REG. #, RC-FLAG, OD-FLAG
64-BIT SCRATCHPAD, FLAGS
64-BIT SCRATCHPAD
DATA MEMORY, REGISTER PAGE
DATA MEMORY, REGISTER PAGE
_______________________________________________________________________________________
5
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相关代理商/技术参数
DS1972-F5 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1024-Bit EEPROM iButton
DS1972-F5# 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1972-F5+ 功能描述:iButton 1024-Bit EEPROM iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1973 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:4-kbit EEPROM iButton
DS1973+F3 制造商:Maxim Integrated Products 功能描述:EEPROM SERL-1WIRE 4KBIT 16PAGES X 256 3.3V/5V F3 CA - Rail/Tube
DS1973+F5 制造商:Maxim Integrated Products 功能描述:IC MEMORY I BUTTON 1973
DS1973-F3 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
DS1973-F3# 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated