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参数资料
| 型号： | DS1977-F5# |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/29页 |
| 文件大小： | 0K |
| 描述： | IBUTTON EEPROM 32KBit F5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| RoHS指令信息： | IButton RoHS Compliance Plan |
| 标准包装： | 14 |
| 系列： | iButton® |
| 存储容量： | 32KB |
| 存储器类型： | EEPROM |
| 产品目录页面： | 1431 (CN2011-ZH PDF) |
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DS1977
Read Access Password
This password only applies to the function "Read Memory with Password”. If passwords are enabled (EPW = AAh,
see Password Control register), the 64-bit data pattern that the 1-Wire master has to transmit with the command
flow is compared to the passwords stored in the DS1977 iButton. The DS1977 delivers the requested data only if
the password transmitted by the master was correct or if password checking is not enabled.
Read Access Password Register
ADDR
7FC0h
7FC1h
b7
RP7
RP15
b6
RP6
RP14
b5
RP5
RP13
b4
RP4
RP12
b3
RP3
RP11
b2
RP2
RP10
b1
RP1
RP9
b0
RP0
RP8
—
—
—
7FC6h
7FC7h
RP55
RP63
RP54
RP62
RP53
RP61
RP52
RP60
RP51
RP59
RP50
RP58
RP49
RP57
RP48
RP56
There is only write access to this register. The Read Access Password needs to be transmitted exactly in the
sequence RP0, RP1… RP62, RP63.
Full Access Password
This password applies to the functions "Read Memory with Password” and "Copy Scratchpad with Password”. If
passwords are enabled (EPW = AAh, see Password Control register), the 64-bit data pattern that the 1-Wire
master has to transmit with the command flow is compared to the passwords stored in the DS1977 iButton. The
DS1977 executes the command only if the password transmitted by the master was correct or if password
checking is not enabled.
Full Access Password Register
ADDR
7FC8h
7FC9h
b7
FP7
FP15
b6
FP6
FP14
b5
FP5
FP13
b4
FP4
FP12
b3
FP3
FP11
b2
FP2
FP10
b1
FP1
FP9
b0
FP0
FP8
—
—
—
7FCEh
7FCFh
FP55
FP63
FP54
FP62
FP53
FP61
FP52
FP60
FP51
FP59
FP50
FP58
FP49
FP57
FP48
FP56
There is only write access to this register. The Full Access Password needs to be transmitted exactly in the
sequence FP0, FP1… FP62, FP63.
Password Control Register
The data pattern stored in the Password Control Register determines whether password checking is enabled. If
password checking is enabled, the password transmitted is compared to the passwords stored in the device.
Reading from or writing to the scratchpad does not require a password.
Password Control Register Bitmap
ADDR
b7
b6
b5
b4
b3
b2
b1
b0
7FD0h
Register Details
EPW
BIT DESCRIPTION
EPW: Enable Passwords
BIT(S)
b0 to b7
DEFINITION
This byte enables or disables the password protection, which applies
to reading from and writing to the memory except for the scratchpad.
If the EPW bits form a pattern of 10101010 (AAh), the device will
execute these commands only if the correct password is transmitted.
The default pattern of EPW is different from AAh.
To enable password checking, the EPW bits need to form a binary pattern of 10101010 (AAh). If the EPW pattern
is different from AAh, any password will be accepted, as long as it has a length of exactly 64 bits. Before enabling
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相关PDF资料 |
PDF描述 |
|---|---|
| DS1982-F5+ | IBUTTON 1KBit ADD-ONLY F5 |
| DS1985-F3+ | IBUTTON 16KBit ADD-ONLY F3 |
| DS1990A-F3+ | IC IBUTTON SERIAL NUMBER F3 |
| DS1990R-F5# | IBUTTON SERIAL NUMBER F5 |
| DS1993L-F5+ | IBUTTON MEMORY 4KBit F5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1977-F5# | 功能描述:iButton Password-Protected 32KB 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 |
| 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 |
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