参数资料
| 型号： | DS2705U+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/18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
Table 1. Presence Detection/Authentication on Power-up Using CHAL Pin
TIME FROM
POWER UP
t = N/A
t < t CHD
t CHD > t > t CHD + t AAT
t > t CHD + t AAT
t > t CHD + t AAT
t = N/A
t < t CHD
t CHD > t > t CHD + t AAT
t > t CHD + t AAT
t > t CHD + t AAT
CHAL PIN
High
Low
Low
Low
Pos Edge
Low
High
High
High
Neg Edge
CHP
BIT
0
0
0
0
0
1
1
1
1
1
TOKEN
PRESENCE
Not Present
Present
Present
Present
Removal
Not Present
Present
Present
Present
Removal
AUTHENTICATION
Armed
Initiated
In Progress
Complete
Reset
Armed
Initiated
In Progress
Complete
Reset
DISPLAY
Hi-Z
Hi-Z
Hi-Z
Active
Reset (Hi-Z)
Hi-Z
Hi-Z
Hi-Z
Active
Reset (Hi-Z)
t AAT : Authentication attempt time represents the period for attempting authentication and is dependent on the
RTA1:0 bits. Minimum time is t SHA , maximum time is 8*t SHA .
Table 2. Insertion Detection/Authentication Using Transition On CHAL Pin
CHAL PIN
High
Neg Edge
Low < t CHD + t AAT
Low > t CHD + t AAT
Pos Edge
Low
Pos Edge
High < 0.5s
High > 0.5s
Neg Edge
CHP BIT
0
0
0
0
0
1
1
1
1
1
TOKEN PRESENCE
Not Present
Insertion
Present
Present
Removal
Not Present
Insertion
Present
Present
Removal
AUTHENTICATION
Armed
Initiated
In Progress
Complete
Reset
Armed
Initiated
In Progress
Complete
Reset
DISPLAY
Hi-Z
Hi-Z
Hi-Z
Active
Reset
Hi-Z
Hi-Z
Hi-Z
Active
Reset
Detection cases 3 and 4 occur through a 1-Wire Reset/Presence Detect sequence on the MDQ pin. In case 3, an
asynchronous 1-Wire presence pulse occurs when a battery with a 1-Wire device is connected to the DS2705. The
DS2705 responds with the authentication sequence. Case 4 is a user configuration option where a 1-Wire reset is
periodically issued on MDQ which then monitors the bus for the presence pulse issued by any/all 1-Wire slave
devices on the bus. If the DS2705 detects a presence pulse, it begins an authentication sequence. The DS2705
can also be configured to periodically test for the continued presence of a 1-Wire slave device once successful
authentication has completed. This allows the status display to be automatically reset when a slave token has been
removed. Table 3 shows the sequence and display activity for presence detection on MDQ.
Table 3. Asynchronous And Periodic Presence Detection Using MDQ Pin
PD
No PD
PD
No PD
TOKEN
PRESENCE
Not Present
Insertion
Present
Removal
AUTHENTICATION
Reset
Initiated
In Progress
Complete
Reset
DISPLAY
Hi-Z
Hi-Z
Hi-Z
Active
Reset (Hi-Z)
8 of 18
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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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