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参数资料
| 型号： | DS2784G+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 35/43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
Figure 9. 1-Wire Bus Interface Circuitry
Vpullup
(2.0 to 5.5V)
Bus Master
Rx
4.7k Ω
Device 1-Wire Port (DQ)
Rx
Tx
Rx = Receive
Tx = Transmit
0.2 μ A
(typ)
Tx
100 Ohm
MOSFET
TRANSACTION SEQUENCE
The protocol for accessing the DS2784 through the 1-Wire port is as follows:
?
?
?
?
Initialization
Net Address Command
Function Command(s)
Data Transfer (not all commands have data transfer)
64 bits, the bus master knows the address of one device. The remaining devices can then be identified on
Standards for a comprehensive
additional iterations of the process. See Chapter 5 of the Book of iButton
All transactions of the 1-Wire bus begin with an initialization sequence consisting of a reset pulse transmitted by the
bus master, followed by a presence pulse simultaneously transmitted by the DS2784 and any other slaves on the
bus. The presence pulse tells the bus master that one or more devices are on the bus and ready to operate. For
more details, see the Net Address Commands section.
NET ADDRESS COMMANDS
Once the bus master has detected the presence of one or more slaves, it can issue one of the net address
commands described in the following paragraphs. The name of each net address command (ROM command) is
followed by the 8-bit op code for that command in square brackets.
Read Net Address [33h]. This command allows the bus master to read the DS2784’s 1-Wire net address. This
command can only be used if there is a single slave on the bus. If more than one slave is present, a data collision
occurs when all slaves try to transmit at the same time (open drain produces a wired-AND result).
Match Net Address [55h]. This command allows the bus master to specifically address one DS2784 on the 1-Wire
bus. Only the addressed DS2784 responds to any subsequent function command. All other slave devices ignore
the function command and wait for a reset pulse. This command can be used with one or more slave devices on
the bus.
Skip Net Address [CCh]. This command saves time when there is only one DS2784 on the bus by allowing the
bus master to issue a function command without specifying the address of the slave. If more than one slave device
is present on the bus, a subsequent function command can cause a data collision when all slaves transmit data at
the same time.
Search Net Address [F0h]. This command allows the bus master to use a process of elimination to identify the
1-Wire net addresses of all slave devices on the bus. The search process involves the repetition of a simple three-
step routine: read a bit, read the complement of the bit, then write the desired value of that bit. The bus master
performs this simple three-step routine on each bit location of the net address. After one complete pass through all
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discussion of a net address search, including an actual example ( www.maxim-ic.com/iButtonBook ).
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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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