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參數(shù)資料
| 型號(hào)： | DS2740U |
| 元件分類： | 通用總線功能 |
| 英文描述： | High-Precision Coulomb Counter |
| 中文描述： | 高精度庫侖計(jì) |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 248K |
| 代理商： | DS2740U |
DS2740
9 of 15
Figure 9.
1-WIRE BUS INTERFACE CIRCUITRY
TRANSACTION SEQUENCE
The protocol for accessing the DS2740 through the 1-Wire port is as follows:
Initialization
Net Address Command
Function Command
Transaction/Data
The sections that follow describe each of these steps in detail.
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 DS2740
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
1-Wire Signaling
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 ROM command is followed by the
8-bit opcode for that command in square brackets. Figure 10 presents a transaction flowchart of the net
address commands.
Read Net Address [33h or 39h].
This command allows the bus master to read the DS2740’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). The RNAOP bit in the status register selects the opcode for this command, with
RNAOP = 0 indicating 33h, and RNAOP = 1 indicating 39h.
Match Net Address [55h].
This command allows the bus master to specifically address one DS2740 on
the 1-Wire bus. Only the addressed DS2740 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.
1 A
(typ)
100
MOSFET
Tx
Rx
Rx
Tx
Rx = RECEIVE
Tx = TRANSMIT
Vpullup
(2.0V to 5.5V)
4.7k
BUS MASTER
DS2740 1-WIRE PORT
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| DS2760 | High Precision Li-Ion Battery Monitor |
| DS2760E | High Precision Li-Ion Battery Monitor |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2740U/R | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Precision Coulomb Counter |
| DS2740U/T | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Precision Coulomb Counter |
| DS2740U/T&R | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| DS2740U+ | 功能描述:電池管理 High-Precision Coulomb Counter RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| DS2740U+T&R | 制造商:Maxim Integrated Products 功能描述:PRECISION COULOMB COUNTER 8USOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CURRENT GAUGE(15BIT) 8UMAX |
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