參數(shù)資料
型號(hào)： DS2761
英文描述： High-Precision Li+ Battery Monitor
中文描述： 高精度、Li+電池監(jiān)視器
文件頁(yè)數(shù)： 15/24頁(yè)
文件大?。?/td> 286K
代理商： DS2761
DS2761
15 of 24
a command sequence from proceeding as a result of a CRC mismatch. Proper use of the CRC can result
in a communication channel with a very high level of integrity.
The CRC can be generated by the host using a circuit consisting of a shift register and XOR gates as
shown in Figure 10, or it can be generated in software. Additional information about the Dallas 1-Wire
CRC is available in Application Note 27,
Understanding and Using Cyclic Redundancy Checks with
Dallas Semiconductor Touch Memory Products
. (This application not can be found on the Maxim/Dallas
Semiconductor website at www.maxim-ic.com).
In the circuit in Figure 14, the shift register bits are initialized to 0. Then, starting with the least
significant bit of the family code, one bit at a time is shifted in. After the 8th bit of the family code has
been entered, then the serial number is entered. After the 48th bit of the serial number has been entered,
the shift register contains the CRC value.
Figure 14.
1-WIRE CRC GENERATION BLOCK DIAGRAM
HARDWARE CONFIGURATION
Because the 1-Wire bus has only a single line, it is important that each device on the bus be able to drive
it at the appropriate time. To facilitate this, each device attached to the 1-Wire bus must connect to the
bus with open-drain or tri-state output drivers. The DS2761 used an open-drain output driver as part of
the bidirectional interface circuitry shown in Figure 15. If a bidirectional pin is not available on the bus
master, separate output and input pins can be connected together.
The 1-Wire bus must have a pullup resistor at the bus-master end of the bus. For short line lengths, the
value of this resistor should be approximately 5k . The idle state for the 1-Wire bus is high. If, for any
reason, a bus transaction must be suspended, the bus must be left in the idle state in order to properly
resume the transaction later. If the bus is left low for more than 120 s, slave devices on the bus begin to
interpret the low period as a reset pulse, effectively terminating the transaction.
Figure 15.
1-WIRE BUS INTERFACE CIRCUITRY
1 A
(typ)
100
MOSFET
Tx
Rx
Rx
Tx
Rx = RECEIVE
Tx = TRANSMIT
Vpullup
(2.0V to 5.5V)
4.7k
BUS MASTER
DS2761 1-WIRE PORT
MSb
XOR
XOR
LSb
XOR
INPUT
相關(guān)PDF資料
PDF描述
DS2761AE High-Precision Li+ Battery Monitor
DS2761AX High-Precision Li+ Battery Monitor
DS2761BE High-Precision Li+ Battery Monitor
DS2761BX-025 High-Precision Li+ Battery Monitor
DS276S Low Power Transceiver Chip
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS2761AE 功能描述:IC MON BATT LI-ION HP 16-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT
DS2761AE+ 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
DS2761AE+025 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
DS2761AE+025/T&R 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:IC MON BATT LI-ION HP 16-TSSOP
DS2761AE+025/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
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