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参数资料
| 型号： | DS2704G+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/18页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 1.25KBIT 6TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 10,000 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 1.25K（32B x 5 页） |
| 接口： | 1 线 串行 |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -30°C ~ 85°C |
| 封装/外壳： | 6-WDFN 裸露焊盘 |
| 供应商设备封装： | 6-TDFN 裸露焊盘（3x3） |
| 包装： | 带卷 (TR) |
DS2704: 1280-Bit EEPROM with SHA-1 Authentication
Table 1. Authentication Function Commands
COMMAND
Write Challenge
Compute MAC without ROM ID
and return MAC
Compute MAC with ROM ID and
return MAC
HEX
0C
36
35
FUNCTION
Writes 64-bit challenge for SHA-1 processing. Required prior to
issuing Compute MAC and Compute Next Secret commands.
Computes hash the message block with logical 1’s in place of the
ROM ID. Returns the 160-bit MAC.
Computes hash of the message block including the ROM ID.
Returns the 160-bit MAC.
SECRET MANAGEMENT FUNCTION COMMANDS
CLEAR SECRET [5Ah]. This command sets the 64-bit secret to all 0’s (0000 0000 0000 0000h). The host must
wait t EEC for the DS2704 to write the new secret value to EEPROM. See Figure 10 on page 20 for command timing.
COMPUTE NEXT SECRET WITHOUT ROM ID [30h]. This command initiates a SHA-1 computation of the MAC
and uses a portion of the resulting MAC as the next or new secret. The MAC computation is performed with the
current 64-bit secret and the 64-bit challenge. Logical 1’s are loaded in place of the ROM ID. 64-bits of the output
MAC are used as the new secret value. The host must allow t SHA after issuing this command for the SHA
calculation to complete, then wait t EEC for the DS2704 to write the new secret value to EEPROM. See Figure 8 on
page 19 for command timing.
COMPUTE NEXT SECRET WITH ROM ID [33h]. This command initiates a SHA-1 computation of the MAC and
uses a portion of the resulting MAC as the next or new secret. The MAC computation is performed with the current
64-bit secret, the 64-bit ROM ID and the 64-bit challenge. 64-bits of the output MAC are used as the new secret
value. The host must allow t SHA after issuing this command for the SHA calculation to complete, then wait t EEC for
the DS2704 to write the new secret value to EEPROM. See Figure 8 on page 19 for command timing.
LOCK SECRET [6Ah]. This command write protects the 64-bit Secret to prevent accidental or malicious overwrite
of the secret value. The Secret value stored in EEPROM becomes "final." The host must wait t EEC for the DS2704
to write the lock secret bit to EEPROM. See Figure 10 on page 20 for command timing.
Table 2. Secret Loading Function Commands
COMMAND
Clear Secret
Compute Next Secret without
ROM ID
Compute Next Secret with
ROM ID
Lock Secret
HEX
5A
30
33
6A
FUNCTION
Clears the 64-bit Secret to 0000 0000 0000 0000h
Generates new global secret
Generates new unique secret
Sets lock bit to prevent changes to the Secret
1-WIRE SPEED CONTROL FUNCTION COMMANDS
CLEAR OVERDRIVE [8Dh]. This command selects the Standard 1-Wire timings shown in the Electrical
Characteristics table. The setting is stored in EEPROM so that the programmed speed selection can be recalled on
initial power up. The host must wait t EEC for the DS2704 to write the EEPROM. See Figure 10 for command timing.
Standard 1-Wire timing is the factory default.
SET OVERDRIVE [8Bh]. This command selects the Overdrive 1-Wire timings shown in the Electrical
Characteristics table. The setting is stored in EEPROM so that the programmed speed selection can be recalled on
initial power up. The host must wait t EEC for the DS2704 to write the EEPROM. See Figure 10 for command timing.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2704K | 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| DS2704REVKIT+ | 制造商:Maxim Integrated Products 功能描述:RMS POWER DETECTOR - Boxed Product (Development Kits) |
| DS2704RG+ | 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| DS2704RG+T&R | 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| DS2704R-K | 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
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