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1024-Bit EEPROM iButton
Memory Function Example
Write to the first 8 bytes of memory page 1. Read the
entire memory.
With only a single DS1972 connected to the bus mas-
ter, the communication looks like this:
MASTER MODE
Tx
Rx
Tx
Tx
Tx
Tx
Tx
Rx
Tx
Rx
Tx
Tx
Rx
Rx
Rx
Rx
Rx
Tx
Rx
Tx
Tx
Tx
DATA (LSB FIRST)
(Reset)
(Presence)
CCh
0Fh
20h
00h
<8 Data Bytes>
<2 Bytes CRC-16 >
(Reset)
(Presence)
CCh
AAh
20h
00h
07h
<8 Data Bytes>
<2 Bytes CRC-16 >
(Reset)
(Presence)
CCh
55h
20h
COMMENTS
Reset pulse
Presence pulse
Issue “Skip ROM ” command
Issue “Write Scratchpad” command
TA1, beginning offset = 20h
TA2, address = 0020h
Write 8 bytes of data to scratchpad
Read CRC to check for data integrity
Reset pulse
Presence pulse
Issue “Skip ROM ” command
Issue “Read Scratchpad” command
Read TA1, beginning offset = 20h
Read TA2, address = 0020h
Read E/S, ending offset = 111b, AA, PF = 0
Read scratchpad data and verify
Read CRC to check for data integrity
Reset pulse
Presence pulse
Issue “Skip ROM ” command
Issue “Copy Scratchpad” command
TA1
Tx
00h
TA2
(AUTHORIZATION CODE)
Tx
—
Rx
Tx
Rx
Tx
Tx
Tx
Tx
Rx
Tx
Rx
07h
<1-Wire Idle High>
AAh
(Reset)
(Presence)
CCh
F0h
00h
00h
<144 Data Bytes>
(Reset)
(Presence)
E/S
Wait t PROGMAX for the copy function to complete
Read copy status, AAh = success
Reset pulse
Presence pulse
Issue “Skip ROM ” command
Issue “Read Memory” command
TA1, beginning offset = 00h
TA2, address = 0000h
Read the entire memory
Reset pulse
Presence pulse
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages . Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
PACKAGE TYPE
F3 iButton
F5 iButton
PACKAGE CODE
IB+3NT
IB+5NT
DOCUMENT NO.
21-0252
21-0266
22
______________________________________________________________________________________
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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