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DS28EA00 Datasheet

  • DS28EA00

  • 1-Wire Digital Thermometer with Sequence Detect and PIO

  • 29頁(yè)

  • DALLAS   DALLAS

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DS28EA00
1-Wire Digital Thermometer
with Sequence Detect and PIO
www.maxim-ic.com
GENERAL DESCRIPTION
The DS28EA00 is a digital thermometer with 9-bit
(0.5 擄C) to 12-bit (1/16 擄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
廬
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
(鈥減arasite power鈥?, eliminating the need for an
external power supply.
SPECIAL FEATURES
Digital Thermometer Measures Temperatures
from -40擄C to +85擄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
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
Standard and Overdrive 1-Wire Speed
Two General-Purpose Programmable IO (PIO)
Pins
Chain Function Sharing the PIO Pins to
Detect Physical Sequence of Devices in
Network
Operating Range: 3.0V to 5.5V, -40擄C to +85擄C
Can be Powered from Data Line
8-Pin 碌SOP Package
APPLICATIONS
Data Communication Equipment
Process Temperature Monitoring
HVAC Systems
TYPICAL OPERATING CIRCUIT
V
DD
1-Wire
Master
PX.Y
(Micro-
controller)
#1
V
DD
IO
DS28EA00
PIOB
PIOA
IO
DS28EA00
PIOB
PIOA
ORDERING INFORMATION
PART
DS28EA00U+
DS28EA00U+T
V
DD
#2
V
DD
#3
IO
DS28EA00
PIOB
PIOA
TEMP RANGE
-40 to +85擄C
-40 to +85擄C
PACKAGE
8-pin 碌SOP
Tape & Reel
+ Denotes lead-free package.
PIN CONFIGURATION
IO
NC
+1
2
3
4
8
7
6
5
V
DD
PIOB
PIOA
NC
GND
GND
GND
Schematic shows PIOs wired for sequence detect function.
NC
GND
Commands, Registers, and Modes are capitalized for
clarity.
1-Wire is a registered trademark of Dallas Semiconductor.
8 pin 碌SOP
Package Outline Drawing
21-0036
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.
1 of 29
061907

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