参数资料
| 型号： | DS2705U+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/18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： | 50 |
| 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： | 管件 |
DS2705: SHA-1 Authentication Master
Figure 1. Block Diagram
VDD
EEPROM
64-bit
Challenge
160-bit MAC
16-bit
Configuration
CHAL
CHP = 0
Control FSM
1-Wire
Master/
Pullup
Control
t CHD + t AAT
Slave
MDQ
SDQ
VSS
DETAILED DESCRIPTION
The DS2705 orchestrates a challenge/response SHA-1 authentication procedure by accessing a Dallas Battery
Management SHA-1 Token product, such as the DS2703 or DS2704. The remote SHA-1 token is accessed with
the MDQ pin acting as the 1-Wire bus master. The DS2705 issues the appropriate 1-Wire command sequence on
MDQ to write the 64-bit challenge, initiates a SHA-1 computation in the token, and then reads back the 160-bit
MAC result. The DS2705 compares the 160-bit MAC received from the battery token with the preprogrammed
MAC. An exact bit for bit match is required for the authentication to be successful. The result of the operation,
PASS or FAIL, is indicated on active low status output pins which can be used to drive status LEDs and/or enable
cell charging.
The DS2705 can be configured to automatically authenticate by detection of a presence pulse on MDQ or
authentication can be controlled by the state of the CHAL input pin. The DS2705’s SDQ pin is a 1-Wire slave
interface for programming the behavior of the I.C.. All EEPROM values can be permanently locked to prevent
corruption.
Figure 2 shows a example application circuit for a standalone battery charger. The DS2705 is preprogrammed for
automatic authentication on MDQ and also contains a known good challenge/response pair. Programming occurs
during assembly through PCB test points shown on the right side of the circuit. When a battery pack is inserted into
the charger, a presence pulse on MDQ will cause the DS2705 to automatically authenticate the pack. The result of
the authentication will be displayed through the LEDs and the DS2705 will either enable or disable the charging
circuit.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2705U+ | 功能描述:电池管理 SHA-1 Authent Master 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 |
| DS2705U+/T&R | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:SHA-1 Authentication Master |
| DS2705U+/TR | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:SHA-1 Authentication Master |
| DS2705U+T&R | 制造商:Maxim Integrated Products 功能描述:SHA-1 AUTHENTICATION MASTER 8PIN UMAX - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC AUTHENTICATE SHA-1 8-UMAX |
| DS2705U+T&R | 功能描述:电池管理 SHA-1 Authent Master 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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