收藏本站
DS2430A
Slave-to-Master
A Read-data time slot begins like a Write-1 time slot. The voltage on the data line must remain below
V TL until the read low time t RL is expired. During the t RL window, when responding with a 0, the
DS2430A starts pulling the data line low; its internal timing generator determines when this pulldown
ends and the voltage starts rising again. When responding with a 1, the DS2430A does not hold the data
line low at all, and the voltage starts rising as soon as t RL is over.
The sum of t RL + δ (rise time) on one side and the internal timing generator of the DS2430A on the other
side define the master sampling window (t MSRMIN to t MSRMAX ) in which the master must perform a read
from the data line. For the most reliable communication, t RL should be as short as permissible, and the
master should read close to but no later than t MSRMAX . After reading from the data line, the master must
wait until t SLOT is expired. This guarantees sufficient recovery time t REC for the DS2430A to get ready for
the next time slot. Note that t REC specified herein applies only to a single DS2430A attached to a 1-Wire
line. For multidevice configurations, t REC must be extended to accommodate the additional 1-Wire device
input capacitance. Alternatively, an interface that performs active pullup during the 1-Wire recovery time
such as the DS2482-x00 or DS2480B 1-Wire line drivers can be used.
IMPROVED NETWORK BEHAVIOR (SWITCHPOINT HYSTERESIS)
In a 1-Wire environment, line termination is possible only during transients controlled by the bus master
(1-Wire driver). 1-Wire networks, therefore, are susceptible to noise of various origins. Depending on the
physical size and topology of the network, reflections from end points and branch points can add up, or
cancel each other to some extent. Such reflections are visible as glitches or ringing on the 1-Wire
communication line. Noise coupled onto the 1-Wire line from external sources can also result in signal
glitching. A glitch during the rising edge of a time slot can cause a slave device to lose synchronization
with the master and, consequently, result in a Search ROM command coming to a dead end or cause a
device-specific function command to abort. For better performance in network applications, the
DS2430A uses a new 1-Wire front end, which makes it less sensitive to noise.
The 1-Wire front end of the DS2430A differs from traditional slave devices in three characteristics.
1) There is additional low-pass filtering in the circuit that detects the falling edge at the beginning of a
time slot. This reduces the sensitivity to high-frequency noise.
2) There is a hysteresis at the low-to-high switching threshold V TH . If a negative glitch crosses V TH but
does not go below V TH - V HY , it will not be recognized (Figure 11, Case A)..
3) There is a time window specified by the rising edge hold-off time t REH during which glitches are
ignored, even if they extend below V TH - V HY threshold (Figure 11, Case B, t GL < t REH ). Deep voltage
droops or glitches that appear late after crossing the V TH threshold and extend beyond the t REH
window cannot be filtered out and are taken as the beginning of a new time slot (Figure 11, Case C,
t GL ≥ t REH ).
Devices that have the parameters V HY , and t REH specified in their electrical characteristics use the
improved 1-Wire front end.
V PUP
NOISE SUPPRESSION SCHEME Figure 11
t REH
V TH
t REH
V HY
0V
Case A
Case B
t GL
Case C
t GL
14 of 19
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
DS2431GA+U IC EEPROM 1024BIT 2SFN
DS2433X-S#T IC EEPROM 4KBIT 6FCHIP
DS2433X-Z01 IC EEPROM 4KBIT 6FCHIP
DS24B33G+T&R IC EEPROM 4KBIT 2SFN
DS2502-E64+ IC OTP 1KBIT TO92-3
DS2502P-E48+T&R IC OTP 1KBIT 6TSOC
DS2502S+ IC OTP 1KBIT 8SOIC
DS2505+T&R IC OTP 16KBIT TO92-3
相关代理商/技术参数
DS2430AP+TR 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:256-Bit 1-Wire EEPROM
DS2430AT 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:256-Bit 1-Wire EEPROM
DS2430AV 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:256-Bit 1-Wire EEPROM
DS2430AX 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
DS2430AX#T&R 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
DS2430AX#U 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
DS2430AX-S 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
DS2430AX-S#T&R 制造商:Maxim Integrated Products 功能描述: