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参数资料
| 型号： | DS2784G+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 33/43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
SECRET MANAGEMENT FUNCTION COMMANDS
CLEAR SECRET [5Ah] . This command sets the 64-bit secret to all 0s (0000 0000 0000 0000h). The host must
wait t EEC for the DS2784 to write the new secret value to EEPROM. See Figure 13 for command timing.
COMPUTE NEXT SECRET WITHOUT ROM ID [30h]. This command initiates a SHA-1 computation of the MAC
and uses a portion of the resulting MAC as the next or new secret. The hash operation is performed with the
current 64-bit secret and the 64-bit challenge. Logical 1s are loaded in place of the ROM ID. 64 bits of the output
MAC are used as the new secret value. The host must allow t SHA after issuing this command for the SHA
calculation to complete, then wait t EEC for the DS2784 to write the new secret value to EEPROM. See Figure 11 for
command timing.
COMPUTE NEXT SECRET WITH ROM ID [33h]. This command initiates a SHA-1 computation of the MAC and
uses a portion of the resulting MAC as the next or new secret. The hash operation is performed with the current 64-
bit secret, the 64-bit ROM ID and the 64-bit challenge. 64 bits of the output MAC are used as the new secret value.
The host must allow t SHA after issuing this command for the SHA calculation to complete, then wait t EEC for the
DS2784 to write the new secret value to EEPROM. See Figure 11 for command timing.
LOCK SECRET [60h]. This command write protects the 64-bit secret to prevent accidental or malicious overwrite
of the secret value. The secret value stored in EEPROM becomes “final”. The host must wait t EEC for the DS2784 to
write the lock secret bit to EEPROM. See Figure 13 for command timing.
Table 10. Secret Loading Function Commands
COMMAND
Clear Secret
Compute Next Secret Without
ROM ID
Compute Next Secret With
ROM ID
Lock Secret
HEX
5A
30
33
60
FUNCTION
Clears the 64-bit Secret to 0000 0000 0000 0000h.
Generates new global secret.
Generates new unique secret.
Sets lock bit to prevent changes to the secret.
1-Wire BUS SYSTEM
The 1-Wire bus is a system that has a single bus master and one or more slaves. A multidrop bus is a 1-Wire bus
with multiple slaves, while a single-drop bus has only one slave device. In all instances, the DS2784 is a slave
device. The bus master is typically a microprocessor in the host system. The discussion of this bus system consists
of five topics: 64-bit net address, CRC generation, hardware configuration, transaction sequence, and 1-Wire
signaling.
64-BIT NET ADDRESS (ROM ID)
Each DS2784 has a unique, factory-programmed 1-Wire net address that is 64 bits in length. The term net address
is synonymous with the ROM ID or ROM code terms used in the DS2502 and other 1-Wire documentation. The first
eight bits of the net address are the 1-Wire family code (32h). The next 48 bits are a unique serial number. The last
eight bits are a cyclic redundancy check (CRC) of the first 56 bits (see Figure 7). The 64-bit net address and the
1-Wire I/O circuitry built into the device enable the DS2784 to communicate through the 1-Wire protocol detailed in
this data sheet.
Figure 7. 1-Wire Net Address Format
8-BIT CRC
MSb
48-BIT SERIAL NUMBER
33 of 43
8-BIT FAMILY
CODE (32H)
LSb
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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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