參數(shù)資料
型號(hào)： DS28E04S-100
元件分類(lèi)： DRAM
英文描述： 4096-Bit Addressable 1-Wire EEPROM with PIO
中文描述： 4096位尋址1 - Wire EEPROM，帶有先鋒
文件頁(yè)數(shù)： 27/36頁(yè)
文件大?。?/td> 347K
代理商： DS28E04S-100
DS28E04-100: 4096-Bit 1-Wire Addressable EEPROM with PIO
27 of 36
OVERDRIVE MATCH ROM [69h]
The Overdrive Match ROM command followed by a 64-bit ROM sequence transmitted at Overdrive speed allows
the bus master to address a specific DS28E04-100 on a multidrop bus and to simultaneously set it in Overdrive
mode. Only the DS28E04-100 that exactly matches the 64-bit ROM sequence responds to the subsequent
Memory/Control Function command. Slaves already in Overdrive mode from a previous Overdrive Skip or
successful Overdrive Match command remain in Overdrive mode. All overdrive-capable slaves return to standard
speed at the next Reset Pulse of minimum 480μs duration. The Overdrive Match ROM command can be used with
a single or multiple devices on the bus.
1-Wire SIGNALING
The DS28E04-100 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 DS28E04-100 can communicate at
two different speeds, standard speed, and Overdrive speed. If not explicitly set into the Overdrive mode, the
DS28E04-100 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 15 as ' ' 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 DS28E04-100 when determining
a logical level, not triggering any events.
Figure 15 shows the initialization sequence required to begin any communication with the DS28E04-100. A Reset
Pulse followed by a Presence Pulse indicates the DS28E04-100 is ready to receive data, given the correct ROM
and Memory/Control 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 DS28E04-100 is in Overdrive Mode and t
RSTL
is no longer than
80μs, the device remains in Overdrive Mode. If the device is in Overdrive Mode and t
RSTL
is
between
80μs and
480μs, the device will reset, but the communication speed is undetermined.
Figure 15. Initialization Procedure: Reset and Presence Pulse
RESISTOR
MASTER
DS28E04
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
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 DS28E04-100 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
DS28E04-100 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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS28E04S-100/T 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
DS28E04S-100+ 功能描述:電可擦除可編程只讀存儲(chǔ)器 4096-Bit Addressable 1-Wire 電可擦除可編程只讀存儲(chǔ)器 w/PIO 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
DS28E04S-100+T 功能描述:電可擦除可編程只讀存儲(chǔ)器 4096-Bit Addressable 1-Wire 電可擦除可編程只讀存儲(chǔ)器 w/PIO 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
DS28E04S-224-BB+T 制造商:Maxim Integrated Products 功能描述:- Tape and Reel
DS28E05P+ 功能描述:電可擦除可編程只讀存儲(chǔ)器 1W 1KB FTP MEMORY TSOC 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
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