參數(shù)資料
型號(hào)： DS2423X
廠商： DALLAS SEMICONDUCTOR
元件分類： Memory IC:Other
英文描述： SPECIALTY MEMORY CIRCUIT, UUC
封裝： CHIP SCALE PKG
文件頁(yè)數(shù)： 6/25頁(yè)
文件大?。?/td> 579K
代理商： DS2423X
DS2422/DS2423
14 of 25
HARDWARE CONFIGURATION Figure 8
1-WIRE BUS SYSTEM
The 1-Wire bus is a system which has a single bus master and one or more slaves. In all instances the
DS242X is a slave device. The bus master is typically a microcontroller. The discussion of this bus
system is broken down into three topics: hardware configuration, transaction sequence, and 1-Wire
signaling (signal types and timing). A 1-Wire protocol defines bus transactions in terms of the bus state
during specific time slots that are initiated on the falling edge of sync pulses from the bus master. For a
more detailed protocol description, refer to Chapter 4 of the Book of DS19xx iButton Standards.
HARDWARE CONFIGURATION
The 1-Wire bus has only a single line by definition; 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 have open
drain or 3-state outputs. The 1-Wire port of the DS242X is open drain with an internal circuit equivalent
to that shown in Figure 8. A multidrop bus consists of a 1-Wire bus with multiple slaves attached. At
regular speed the 1-Wire bus has a maximum data rate of 16.3 kbits per second. The speed can be boosted
to 142 kbits per second by activating the Overdrive Mode. The 1-Wire bus requires a pullup resistor of
approximately 5 kO.
The idle state for the 1-Wire bus is high. If for any reason a transaction needs to be suspended, the bus
MUST be left in the idle state if the transaction is to resume. If this does not occur and the bus is left low
for more than 16 s (Overdrive Speed) or more than 120 s (regular speed), one or more devices on the
bus may be reset.
TRANSACTION SEQUENCE
The protocol for accessing the DS242X via the 1-Wire port is as follows:
§ Initialization
§ ROM Function Command
§ Memory Function Command
§ Transaction/Data
相關(guān)PDF資料
PDF描述
DS2423 4K X 1 STANDARD SRAM, PDSO6
DS2422 1K X 1 STANDARD SRAM, PDSO6
DS2430AP 256 X 1 1-WIRE SERIAL EEPROM, PDSO6
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS243 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC
DS2430 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:256-Bit 1-Wire EEPROM
DS2430A 功能描述:電可擦除可編程只讀存儲(chǔ)器 RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8
DS2430A R 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:256-Bit 1-Wire EEPROM
DS2430A T 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:256-Bit 1-Wire EEPROM
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