参数资料
| 型号： | DS2705U+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/18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 2. Typical Application Circuit
BATTERY TOKEN PRESENCE DETECTION
Authentication of a battery or peripheral first depends on the authentication host detecting the presence or insertion
(electrical connection) of the accessory to the host unit. The DS2705 supports insertion detection in four ways, two
use the CHAL pin and two use the MDQ pin:
1. CHAL pin at the active logic level on IC power-up (detected after challenge delay time t CHD ). Positive or
negative logic level is determined by the CHP bit.
2. CHAL pin edge trigger after power-up period. Positive or negative edge trigger is determined by the CHP
bit.
3. Detection of Asynchronous 1-Wire Presence Pulse by insertion of battery with 1-Wire device (token).
4. Periodic Authentication Attempt issuing a 1-Wire Reset on MDQ to test for presence of a 1-Wire token.
With cases 1 and 2 above, the CHAL pin acts as a detection trigger when pulled to a logic low or logic high. A split
contact on the battery ground or supply terminal can be used to connect the CHAL pin to the positive or negative
battery terminal when the battery is present. In case 1, when the battery is connected prior to powering up the host
system (which occurs often since the battery typically powers the host), presence is detected by sensing the logic
level on CHAL immediately after power-up of the DS2705. A configuration bit, CHP, allows the use of either polarity
of the CHAL pin. Table 1 shows the timing and sequence of events for detecting presence on power-up. In case 2
above, the DS2705 monitors the CHAL pin for a signal transition after the power-up period is complete. The
DS2705 detects an authentication attempt on a positive or a negative edge of CHAL depending on the state of the
CHP bit. Table 2 shows the timing and sequence of detecting presence with an edge on CHAL.
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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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