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DS28EA00

更新时间： 2024-11-05 03:11:31
品牌 Logo 应用领域
达拉斯 - DALLAS /
页数 文件大小 规格书
29页 214K
描述
1-Wire Digital Thermometer with Sequence Detect and PIO

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DS28EA00 数据手册

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DS28EA00  
1-Wire Digital Thermometer  
with Sequence Detect and PIO  
www.maxim-ic.com  
GENERAL DESCRIPTION  
SPECIAL FEATURES  
The DS28EA00 is a digital thermometer with 9-bit  
(0.5 °C) to 12-bit (1/16 °C) resolution and alarm  
function with nonvolatile (NV), user-programmable  
upper and lower trigger points. Each DS28EA00 has  
its unique 64-bit registration number that is factory-  
programmed into the chip. Data is transferred serially  
through the 1-Wire® protocol, which requires only one  
data line and a ground for communication. The  
improved 1-Wire front end with hysteresis and glitch  
filter enables the DS28EA00 to perform reliably in  
large 1-Wire networks. Unlike other 1-Wire thermo-  
meters, the DS28EA00 has two additional pins to  
implement a sequence detect function. This feature  
allows the user to discover the registration numbers  
according to the physical device location in a chain,  
e.g., to measure the temperature in a storage tower  
at different height. If the sequence detect function is  
not needed, these pins can be used as general-  
purpose input or output. The DS28EA00 can derive  
the power for its operation directly from the data line  
(“parasite power”), eliminating the need for an  
external power supply.  
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Digital Thermometer Measures Temperatures  
from -40°C to +85°C  
Thermometer Resolution is User-Selectable  
from 9 to 12 Bits  
Unique 1-Wire Interface Requires Only One  
Port Pin for Communication  
Each Device has a Unique 64-Bit Factory-  
Lasered Registration Number  
ROM Multidrop Capability Simplifies  
Distributed Temperature-Sensing  
Applications  
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Improved 1-Wire Interface with Hysteresis  
and Glitch Filter  
User-Definable Nonvolatile (NV) Alarm  
Threshold Settings/User Bytes  
Alarm Search Command to Quickly Identify  
Devices Whose Temperature is Outside of  
Programmed Limits  
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Standard and Overdrive 1-Wire Speed  
Two General-Purpose Programmable IO (PIO)  
Pins  
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Chain Function Sharing the PIO Pins to  
Detect Physical Sequence of Devices in  
Network  
APPLICATIONS  
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Operating Range: 3.0V to 5.5V, -40°C to +85°C  
Can be Powered from Data Line  
8-Pin µSOP Package  
Data Communication Equipment  
Process Temperature Monitoring  
HVAC Systems  
ORDERING INFORMATION  
TYPICAL OPERATING CIRCUIT  
PART  
TEMP RANGE  
-40 to +85°C  
-40 to +85°C  
PACKAGE  
8-pin µSOP  
Tape & Reel  
VDD  
DS28EA00U+  
DS28EA00U+T  
1-Wire  
Master  
#1  
IO  
#2  
#3  
IO  
VDD  
VDD  
VDD  
PX.Y  
IO  
+ Denotes lead-free package.  
DS28EA00  
PIOB PIOA  
GND  
DS28EA00  
PIOB PIOA  
GND  
DS28EA00  
PIOB PIOA  
GND  
(Micro-  
controller)  
PIN CONFIGURATION  
IO  
NC  
VDD  
+
1
2
3
4
8
7
6
5
PIOB  
PIOA  
NC  
Schematic shows PIOs wired for sequence detect function.  
NC  
GND  
Commands, Registers, and Modes are capitalized for  
clarity.  
8 pin µSOP  
Package Outline Drawing 21-0036  
1-Wire is a registered trademark of Dallas Semiconductor.  
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device  
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.  
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