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參數資料
| 型號： | DS28EA00U+T&R |
| 廠商： | Maxim Integrated |
| 文件頁數： | 22/29頁 |
| 文件大小： | 328K |
| 描述： | IC THERMOMETER 1-WIRE 8-USOP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 3,000 |
| 功能： | 溫度計，恒溫計 |
| 傳感器類型： | 內部 |
| 感應溫度： | -40°C ~ 85°C |
| 精確度： | ±0.5°C（最小值） |
| 拓撲： | 寄存器庫，變簽式暫存器 |
| 輸出類型： | 數字 |
| 輸出警報： | 是 |
| 輸出風扇： | 無 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 8-uMAX |
| 包裝： | 帶卷 (TR) |
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1-Wire Signaling
The DS28EA00 requires strict protocols to ensure data
integrity. The protocol consists of four types of signaling
on one line: reset sequence with reset pulse and pres-
ence pulse, write-zero, write-one, and read-data.
Except for the presence pulse, the bus master initiates
all falling edges. The DS28EA00 can communicate at
two different speeds, standard speed and overdrive
speed. If not explicitly set into the overdrive mode, the
DS28EA00 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 12 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 DS28EA00 when
determining a logical level, not triggering any events.
Figure 12 shows the initialization sequence required to
begin any communication with the DS28EA00. A reset
pulse followed by a presence pulse indicates the
DS28EA00 is ready to receive data, given the correct
ROM and 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 480祍 or longer exits the overdrive
mode, returning the device to standard speed. If the
DS28EA00 is in overdrive mode and t
RSTL
is no longer
than 80祍, the device remains in overdrive mode. If the
device is in overdrive mode and t
RSTL
is between 80祍
and 480祍, the device resets, but the communication
speed is undetermined.
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 the case of a DS2482-
x00 or DS2480B driver, by active circuitry. When the
threshold V
TH
is crossed, the DS28EA00 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 DS28EA00 is ready for data communica-
tion. In a mixed population network, t
RSTH
should be
extended to minimum 480祍 at standard speed and
48祍 at overdrive speed to accommodate other 1-Wire
devices.
Read/Write Time Slots
Data communication with the DS28EA00 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 13 illus-
trates 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 DS28EA00 starts its inter-
nal 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.
1-Wire Digital Thermometer with
Sequence Detect and PIO
DS28EA00
22
Maxim Integrated
RESISTOR
MASTER
DS28EA00
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
?/DIV>
t
F
t
REC
t
MSP
Figure 12. Initialization Procedure Reset and Presence Pulses
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| DS28EC20+ | 功能描述:電可擦除可編程只讀存儲器 20Kb 1-Wire 電可擦除可編程只讀存儲器 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數據保留:100 yr 最大時鐘頻率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
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