- 您现在的位置：买卖IC网 > PDF目录378591 > DS2431X The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each PDF资料下载
参数资料
| 型号： | DS2431X |
| 元件分类： | DRAM |
| 英文描述： | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| 中文描述： | 该CAT24FC02是一个2 KB的EEPROM的国内256个8位每字举办的串行CMOS |
| 文件页数： | 18/23页 |
| 文件大小： | 170K |
| 代理商： | DS2431X |
DS2431: 1024-Bit, 1-Wire EEPROM
18 of 23
1-Wire SIGNALING
The DS2431 requires strict protocols to ensure data integrity. The protocol consists of four types of signaling on
one line: Reset Sequence with Reset Pulse and Presence Pulse, Write-Zero, Write-One, and Read-Data. Except
for the Presence pulse, the bus master initiates all falling edges. The DS2431 can communicate at two different
speeds, standard speed, and Overdrive Speed. If not explicitly set into the Overdrive mode, the DS2431
communicates at standard speed. While in Overdrive Mode the fast timing applies to all waveforms.
To get from idle to active, the voltage on the 1-Wire line needs to fall from V
PUP
below the threshold V
TL
. To get
from active to idle, the voltage needs to rise from V
ILMAX
past the threshold V
TH
. The time it takes for the voltage to
make this rise is seen in Figure 10 as '
ε
' and its duration depends on the pullup resistor (R
PUP
) used and the
capacitance of the 1-Wire network attached.
The voltage V
ILMAX
is relevant for the DS2431 when determining a
logical level, not triggering any events.
Figure 10 shows the initialization sequence required to begin any communication with the DS2431. A Reset Pulse
followed by a Presence Pulse indicates the DS2431 is ready to receive data, given the correct ROM and memory
function command. If the bus master uses slew-rate control on the falling edge, it must pull down the line for t
RSTL
+
t
F
to compensate for the edge. A t
RSTL
duration of 480μs or longer exits the Overdrive Mode, returning the device to
standard speed. If the DS2431 is in Overdrive Mode and t
RSTL
is no longer than 80μs. the device remains in
Overdrive Mode.
Figure 10. Initialization Procedure: Reset and Presence Pulse
RESISTOR
MASTER
DS2431
t
RSTL
t
PDL
t
RSTH
t
PDH
MASTER TX “RESET PULSE”
MASTER RX “PRESENCE PULSE”
V
PUP
V
IHMASTER
V
TH
V
TL
V
ILMAX
0V
ε
t
F
t
REC
t
MSP
After the bus master has released the line it goes into receive mode. Now the 1-Wire bus is pulled to V
PUP
through
the pullup resistor, or in case of a DS2482-x00 or DS2480B driver, by active circuitry. When the threshold V
TH
is
crossed, the DS2431 waits for t
PDH
and then transmits a Presence Pulse by pulling the line low for t
PDL
. To detect a
presence pulse, the master must test the logical state of the 1-Wire line at t
MSP
.
The t
RSTH
window must be at least the sum of t
PDHMAX
, t
PDLMAX
, and t
RECMIN
. Immediately after t
RSTH
is expired, the
DS2431 is ready for data communication. In a mixed population network, t
RSTH
should be extended to minimum
480μs at standard speed and 48μs at Overdrive speed to accommodate other 1-Wire devices.
Read-/Write-Time Slots
Data communication with the DS2431 takes place in time slots, which carry a single bit each. Write-time slots
transport data from bus master to slave. Read-time slots transfer data from slave to master. Figure 11 illustrates
the definitions of the write- and read-time slots.
All communication begins with the master pulling the data line low. As the voltage on the 1-Wire line falls below the
threshold V
TL
, the DS2431 starts its internal timing generator that determines when the data line is sampled during
a write-time slot and how long data is valid during a read-time slot.
相关PDF资料 |
PDF描述 |
|---|---|
| DS2441 | 1-Cell Li-Ion Battery Manager |
| DS2450 | 1-Wire Quad A/D Converter |
| DS2450S | 1-Wire Quad A/D Converter |
| DS2480 | Serial 1.Wire Line Driver |
| DS2480S | Serial 1.Wire Line Driver |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2431X+ | 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 |
| DS2431X+S | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1024-Bit, 1-Wire EEPROM |
| DS2431X+U | 功能描述:电可擦除可编程只读存储器 1024-BIT 1-WIRE 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 |
| DS2431X-S | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1024-Bit, 1-Wire EEPROM |
| DS2431X-S+ | 功能描述:电可擦除可编程只读存储器 1024-Bit 1-Wire 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 |
发布紧急采购，3分钟左右您将得到回复。