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参数资料
| 型号： | DS2784G+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 32/43页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE STND-ALONE 14-TDFN |
| 产品培训模块： | 1-Wire Communications Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 功能： | 燃料，电量检测计/监控器 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 2.5 V ~ 4.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x5） |
| 包装： | 管件 |
| 产品目录页面： | 1437 (CN2011-ZH PDF) |
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DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication
AUTHENTICATION
Authentication is performed using a FIPS-180-compliant SHA-1 one-way hash algorithm on a 512-bit message
block. The message block consists of a 64-bit secret, a 64-bit challenge and 384 bits of constant data. Optionally,
the 64-bit net address replaces 64 of the 384 bits of constant data used in the hash operation. Contact Maxim for
details of the message block organization.
The host and the DS2784 both calculate the result based on the mutually known secret. The result of the hash
operation is known as the message authentication code (MAC) or message digest. The MAC is returned by the
DS2784 for comparison to the host’s MAC. Note that the secret is never transmitted on the bus and thus cannot be
captured by observing bus traffic. Each authentication attempt is initiated by the host system by providing a 64-bit
random challenge by the Write Challenge command. The host then issues the compute MAC or compute MAC with
ROM ID command. The MAC is computed per FIPS 180, and then returned as a 160-bit serial stream, beginning
with the least significant bit.
DS2784 AUTHENTICATION COMMANDS
WRITE CHALLENGE [0Ch]. This command writes the 64-bit challenge to the DS2784. The LSB of the 64-bit data
argument can begin immediately after the MSB of the command has been completed. If more than 64-bits are
written, the final value in the challenge register will be indeterminate. The Write Challenge command must be
issued prior to every Compute MAC or Compute Next Secret command for reliable results.
COMPUTE MAC WITHOUT ROM ID [36h]. This command initiates a SHA-1 computation without including the
ROM ID in the message block. Since the ROM ID is not used, this command allows the use of a master secret and
MAC response independent of the ROM ID. The DS2784 computes the MAC in t SHA after receiving the last bit of
this command. After the MAC computation is complete, the host must write 8 write-zero time slots and then issue
160 read-time slots to receive the 20-byte MAC. See Figure 10 for command timing.
COMPUTE MAC WITH ROM ID [35h]
This command is structured the same as the compute MAC without ROM ID, except that the ROM ID is included in
the message block. With the ROM ID unique to each DS2784 included in the MAC computation, the MAC is unique
to each token. See White Paper 4: Glossary of 1-Wire SHA-1 Terms , for more information. See Figure 10 for
command timing.
SHA-1-related commands used while authenticating a battery or peripheral device are summarized in Table 9 for
convenience. Four additional commands for clearing, computing, and locking of the secret are described in detail in
the following section.
Table 9. 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 operation of the message block with logical 1s in
place of the ROM ID. Returns the 160-bit MAC.
Computes hash operation of the message block including the
ROM ID. Returns the 160-bit MAC.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2784G R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication |
| DS2784G T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication |
| DS2784G+ | 功能描述:电池管理 Stand-Alone Fuel Gauge 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 |
| DS2784G+R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Cell Stand-Alone Fuel Gauge IC with Li Protector and SHA-1 Authentication |
| DS2784G+T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Cell Stand-Alone Fuel Gauge IC with Li Protector and SHA-1 Authentication |
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