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DS28EA00U+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29
General Description
The DS28EA00 is a digital thermometer with 9-bit (0.5°C)
to 12-bit (1/16°C) resolution and alarm function with non-
volatile (NV), user-programmable upper and lower trigger
points. Each DS28EA00 has its own unique 64-bit regis-
tration 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 reference
for communication. The improved 1-Wire front-end with
hysteresis and glitch filter enables the DS28EA00 to per-
form reliably in large 1-Wire networks. Unlike other 1-Wire
thermometers, 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 out-
put. The DS28EA00 can derive the power for its operation
directly from the data line (“parasite power”), eliminating
the need for an external power supply.
Applications
Data Communication Equipment
Process Temperature Monitoring
HVAC Systems
Features
♦ 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
♦ Multidrop Capability Simplifies Distributed
Temperature-Sensing Applications
♦ Improved 1-Wire Interface with Hysteresis and
Glitch Filter
♦ User-Definable 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°C to +85°C
♦ Can Be Powered from Data Line
♦ 8-Pin µSOP Package
DS28EA00
1-Wire Digital Thermometer with
Sequence Detect and PIO
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
Ordering Information
DS28EA00
IO
PIOB PIOA
GND
V
DD
V
DD
NOTE: SCHEMATIC SHOWS PIO PINS WIRED FOR SEQUENCE-DETECT FUNCTION.
1-Wire
MASTER
#1
DS28EA00
IO
PIOB
PX. Y
MICROCONTROLLER
PIOA
GND
V
DD
#2
DS28EA00
IO
PIOB PIOA
GND
V
DD
#3
Typical Operating Circuit
Rev 2; 4/09
PART TEMP RANGE PIN-PACKAGE
DS28EA00U+ -40°C to +85° C 8 μSOP
DS28EA00U+T&R -40°C to +85°C 8 μSOP
Pin Configuration appears at end of data sheet.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
1-Wire Digital Thermometer with
Sequence Detect and PIO
DS28EA00
2 Maxim Integrated
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(T
A
= -40°C to +85°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IO Voltage Range to GND ........................................-0.5V to +6V
IO Sink Current....................................................................20mA
Maximum PIOA or PIOB Pin Current...................................20mA
Maximum Current Through GND Pin ..................................40mA
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature...........................Refer to the IPC/JEDEC
J-STD-020 Specification.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
POWER SUPPLY
Supply Voltage V
DD
(Note 2) 3.0 5.5 V
Supply Current (Note 3) I
DD
V
DD
= +5.5V 1.5 mA
Standby Current I
DDS
V
DD
= +5.5V 1.5 μA
IO PIN: GENERAL DATA
Local power 3.0 V
DD
1-Wire Pullup Voltage (Note 2) V
PUP
Parasite power 3.0 5.5
V
1-Wire Pullup Resistance R
PUP
(Notes 2, 4) 0.3 2.2 k
Input Capacitance C
IO
(Notes 3, 5) 1000 pF
Input Load Current I
L
IO pin at V
PUP
0.1 1.5 μA
High-to-Low Switching Threshold V
TL
(Notes 3, 6, 7) 0.46
V
PUP
-
1.9V
V
Parasite powered 0.5
Input Low Voltage (Notes 2, 8) V
IL
V
DD
powered (Note 3) 0.7
V
Low-to-High Switching Threshold
(Notes 3, 6, 9)
V
TH
Parasite power 1.0
V
PUP
-
1.1V
V
Switching Hysteresis
(Notes 3, 6, 10)
V
HY
Parasite power 0.21 1.7 V
Output Low Voltage (Note 11) V
OL
At 4mA 0.4 V
Standard speed, R
PUP
= 2.2k 5
Overdrive speed, R
PUP
= 2.2k 2
Recovery Time
(Notes 2, 12)
t
REC
Overdrive speed, directly prior to reset
pulse; R
PUP
= 2.2k
5
μs
Standard speed 0.5 5.0
Rising-Edge Hold-Off Time
(Notes 3, 13)
t
REH
Overdrive speed Not applicable (0)
μs
Standard speed 65
Time-Slot Duration
(Notes 2, 14)
t
SLOT
Overdrive speed 8
μs
IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE
Standard speed 480 640
Reset Low Time (Note 2) t
RSTL
Overdrive speed 48 80
μs
1-Wire Digital Thermometer with
Sequence Detect and PIO
DS28EA00
Maxim Integrated 3
ELECTRICAL CHARACTERISTICS (continued)
(T
A
= -40°C to +85°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Standard speed 15 60
Presence-Detect High Time t
PDH
Overdrive speed 2 6
μs
Standard speed 1.125 8.1
Presence-Detect Fall Time
(Notes 3, 15)
t
FPD
Overdrive speed 0 1.3
μs
Standard speed 60 240
Presence-Detect Low Time t
PDL
Overdrive speed 8 24
μs
Standard speed 68.1 75
Presence-Detect Sample Time
(Notes 2, 16)
t
MSP
Overdrive speed 7.3 10
μs
IO PIN: 1-Wire WRITE
Standard speed 60 120
Write-Zero Low Time
(Notes 2, 17)
t
W0L
Overdrive speed 6 16
μs
Standard speed 5 15
Write-One Low Time
(Notes 2, 17)
t
W1L
Overdrive speed 1 2
μs
IO PIN: 1-Wire READ
Standard speed 5 15 -
Read Low Time (Notes 2, 18) t
RL
Overdrive speed 1 2 -
μs
Standard speed t
RL
+ 15
Read Sample Time (Notes 2, 18) t
MSR
Overdrive speed t
RL
+ 2
μs
PIO PINS
Input Low Voltage V
ILP
(Note 2) 0.3 V
Input High Voltage (Note 2) V
IHP
V
X
= Max(V
PUP
, V
DD
) V
X
- 1.6 V
Input Load Current (Note 19) I
LP
Pin at GND -1.1 μA
Output Low Voltage (Note 11) V
OLP
At 4mA 0.4 V
Chain-On Pullup Impedance R
CO
(Note 3) 20 40 60 k
EEPROM
Programming Current I
PROG
(Notes 3, 20) 1.5 mA
Programming Time t
PROG
(Note 21) 10 ms
At +25°C 200,000
Write/Erase Cycles (Endurance)
(Notes 22, 23)
N
CY
-40°C to +85°C 50,000
—
Data Retention (Notes 24, 25) t
DR
At +85°C (worst case) 10 Years
TEMPERATURE CONVERTER
Conversion Current I
CONV
(Notes 3, 20) 1.5 mA
12-bit resolution (1/16°C) 750
11-bit resolution (1/8°C) 375
10-bit resolution (1/4°C) 187.5
Conversion Time (Note 26) t
CONV
9-bit resolution (1/2°C) 93.75
ms
-10°C to +85°C -0.5 +0.5
Conversion Error 
Below -10°C (Note 3) -0.5 +2.0
°C
Converter Drift
D
(Note 27) -0.2 +0.2 °C
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29

DS28EA00U+

Mfr. #:
Buy DS28EA00U+
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors 1-Wire Digital Therm w/Sequence Dtct-PIO
Lifecycle:
New from this manufacturer.
Delivery:
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