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DS1977
With only a single DS1977 connected to the bus master, the communication is as follows:
MASTER MODE
DATA (LSB FIRST)
COMMENTS
Step 1
Step 2
TX
RX
TX
TX
TX
TX
TX
TX
RX
TX
TX
RX
RX
RX
RX
(Reset)
(Presence)
CCh
0Fh
A0h
00h
<10 Data Bytes>
(Reset)
(Presence)
CCh
AAh
A0h
00h
29h
<10 Bytes>
Reset Pulse
Presence Pulse
Issue Skip ROM Command
Issue Write Scratchpad Command
TA1, Target Address = A0h (Start Address)
TA2, Target Address = 00A0h
Write Data Bytes to Scratchpad
Reset Pulse
Presence Pulse
Issue Skip ROM Command
Issue Read Scratchpad Command
Read TA1, Target Address = A0h
Read TA2, Target Address = 00A0h
Read E/S-Byte
Read from Scratchpad and Compare to what
was Written
TX
RX
(Reset)
(Presence)
Reset Pulse
Presence Pulse
Step 3
TX
TX
CCh
99h
Issue Skip ROM Command
Issue Copy Scratchpad with Password
Command
TX
TX
TX
TX
(—)
RX
TX
RX
A0h
00h
29h
<Full-Access Password>
(Activate Strong Pullup for t PROG )
AAh
(Reset)
(Presence)
TA1, Target Address = A0h
TA2, Target Address = 00A0h
E/S-Byte
Transmit Full-Access Password (8 Bytes)
Supply Power for Programming
Read to Check for Programming Success;
AAh Means Success
Reset Pulse
Presence Pulse
Step 4
TX
TX
CCh
69h
Issue Skip ROM Command
Issue Read Memory with Password
Command
TX
TX
TX
(—)
RX
RX
80h
00h
<Read Password>
(Activate Strong Pullup for t PROG )
<64 Bytes>
<2 Bytes CRC16>
TA1, Target Address = 80h
TA2, Target Address = 0080h
Transmit Read Password (8 Bytes)
Supply Power for Reading
Read Data from Page 2
Read Inverted CRC16
Step 5
(—)
RX
RX
TX
RX
(Activate Strong Pullup for t PROG )
<64 Bytes>
<2 Bytes CRC16>
(Reset)
(Presence)
Supply Power for Reading
Read Data from Page 3
Read Inverted CRC16
Reset Pulse
Presence Pulse
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DS1977-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
DS1981U-F3-1125+ 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
DS1981U-F3-114C+ 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
DS1981U-F5-1124+ 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
DS1981U-F5-1126+ 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
DS1981U-F5-1130+ 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
DS1981U-F5-1136+ 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
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