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| 型号： | DS2705U+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | IC AUTHENTICATE SHA-1 8-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 3,000 |
| 功能： | 电池验证 |
| 电池化学： | 所有电池类型 |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 带卷 (TR) |
DS2705: SHA-1 Authentication Master
AUTHENTICATION SEQUENCE
Following the detection of the battery, the DS2705 initiates the authentication sequence. The sequence is executed
in whole each time authentication is initiated. See Figure 4.
1. Test for presence with 1-Wire RESET.
2. Issue SKIP ROM (SKIP NET ADDRESS) command.
3. Issue Write Challenge command with 64-bit Challenge data.
4. Issue Compute MAC without ROMID command to SHA-1 token.
5. Provide strong pullup on DQ output.
6. Issue 8 write 0 timeslots.
7. Issue read time slots to receive MAC from token.
8. Compare local and token MAC results.
9. If configured for multiple attempts, re-try until authentication complete.
10. Test for presence with 1-Wire RESET.
11. Update status on PASS or FAIL pins.
Note: If the DS2705 does not receive a presence pulse after presence has been established, or the presence
test in step 9. fails, then the status is reported as not present with both the PASS and FAIL pins hi-Z.
PREPROGRAMMED CHALLENGE AND RESPONSE
A challenge response authentication system does not require a truly random set of challenges. The set of unique
challenges must be sufficiently large that it precludes the use of a lookup table type of attack. If a large enough set
of unique challenges is dispersed over a population of portable devices, then each portable device does not need
to store the secret key and duplicate the computation of the MAC. It need only store one challenge response pair to
provide a practical barrier to battery clones. This system requires that every battery contain the secret key and
SHA-1 algorithm so that it is compatible with any portable device it might be required to power.
The DS2705 stores the preprogrammed challenge and response MAC. This serves to lower the cost and increase
the secrecy of the key since the key does not have to be programmed into the DS2705. Dallas Semiconductor
recommends not using any challenge response pair where either the challenge or MAC is all ‘0’s or all ‘1’s to
prevent accidental authentication of an open or shorted communication bus.
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相关代理商/技术参数 |
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| DS2710EVKIT+ | 制造商:Maxim Integrated Products 功能描述:DS2710 EVAL KIT - Boxed Product (Development Kits) |
| DS2710G | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Single-Cell NiMH Charger |
| DS2710G+ | 功能描述:电池管理 Single-Cell NiMH Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| DS2710G+T&R | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:CHGR NIMH 10TDFN EP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC NIMH CHRGR SGL-CELL 10-TDFN |
| DS2710G+T&R | 功能描述:电池管理 Single-Cell NiMH Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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