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參數資料
| 型號： | DS28EA00U+T&R |
| 廠商： | Maxim Integrated |
| 文件頁數： | 17/29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 Bus System
The 1-Wire bus is a system that has a single bus master
and one or more slaves. In all instances the DS28EA00
is a slave device. The bus master is typically a micro-
controller. The discussion of this bus system is broken
down into three topics: hardware configuration, trans-
action sequence, and 1-Wire signaling (signal types
and timing). The 1-Wire protocol defines bus transac-
tions in terms of the bus state during specific time slots,
which are initiated on the falling edge of sync pulses
from the bus master.
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
three-state outputs. The 1-Wire port of the DS28EA00 is
open drain with an internal circuit equivalent to that
shown in Figure 10.
A multidrop bus consists of a 1-Wire bus with multiple
slaves attached. The DS28EA00 supports both a stan-
dard and overdrive communication speed of 15.3kbps
(max) and 125kbps (max), respectively. Note that lega-
cy 1-Wire products support a standard communication
speed of 16.3kbps and overdrive of 142kbps. The
slightly reduced rates for the DS28EA00 are a result of
additional recovery times, which in turn are driven by a
1-Wire physical interface enhancement to improve
noise immunity. The value of the pullup resistor primari-
ly depends on the network size and load conditions.
The DS28EA00 requires a pullup resistor of 2.2k?/DIV>
(max) at any speed.
The idle state for the 1-Wire bus is high. If for any rea-
son 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祍 (overdrive speed) or more than 120祍 (standard
speed), one or more devices on the bus could be reset.
Transaction Sequence
The protocol for accessing the DS28EA00 through the
1-Wire port is as follows:
" Initialization
" ROM Function Command
" Control Function Command
" Transaction/Data
Initialization
All transactions on the 1-Wire bus begin with an initial-
ization sequence. The initialization sequence consists
of a reset pulse transmitted by the bus master followed
by presence pulse(s) transmitted by the slave(s). The
presence pulse lets the bus master know that the
DS28EA00 is on the bus and is ready to operate. For
more details, see the 1-Wire Signaling section.
1-Wire Digital Thermometer with
Sequence Detect and PIO
DS28EA00
Maxim Integrated
17
Rx
R
PUP
I
L
V
PUP
BUS MASTER
OPEN-DRAIN
PORT PIN
100?MOSFET
Tx
Rx
Tx
DATA
DS28EA00 1-Wire PORT
Rx = RECEIVE
Tx = TRANSMIT
Figure 10. Hardware Configuration
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相關代理商/技術參數 |
參數描述 |
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| DS28EC20 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:DS28EC20_1203 |
| DS28EC20 T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:DS28EC20_1203 |
| DS28EC20_11 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:20Kb 1-Wire EEPROM |
| DS28EC20_1203 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:DS28EC20_1203 |
| 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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