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PDF ADT7401 Data sheet ( Hoja de datos )
| Número de pieza | ADT7401 | |
| Descripción | +-0.5C Accurate 12-Bit Digital Temperature Sensor | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADT7401 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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SMBus/I2C® Compatible, ±0.5°C Accurate 12-Bit
www.DataSheet4U.com
Digital Temperature Sensor with Daisy Chain
Preliminary Technical Data
ADT7401
FEATURES
12-Bit Temperature-to-Digital Converter
±0.5°C Accuracy at 25°C
±1°C Accuracy from 0°C to +70°C
Operation from -40°C to 150°C
Operation from 2.7V to 5.5V
Power Consumption TBD mW Max at 5.5 V
Power Saving One Shot Mode
Pin Selectable Addressing via AS pin
Sub-SMBus/I2C Bus via DC pin
Small Low Cost 6-Pin SOT-23 Package and 8-Pin
MSOP
APPLICATIONS
Isolated Sensors
Environmental Control Systems
Refrigeration Systems
Thermal Protection
Industrial Process Control
Power System Monitors
Automotive
Medical
GENERAL DESCRIPTION
The ADT7401 is a complete temperature monitoring system
that outputs a 12-bit digital word corresponding to the temp-
erature of the ADT7401’s silicon. The device offers a high
temperature accuracy of ±1°C from 0°C to +70°C, with
excellent transducer linearity. The digital output of the
ADT7401 is SMBus/I2C compatible.
The ADT7401 is specified for operation at supply voltages from
2.7 V to 5.5 V. Operating at 3.3 V the supply current is typically
230 µA.
The ADT7401 is rated for operation over the -40°C to +150°C
temperature range. It is packaged in a low cost, low area SOT-23
package and mini-SOIC package. The SMBus ALERT pin is an
open-drain output that is used as an out of limit temperature
indicator. It can be wired-AND with other SMBus ALERT pins
and is used in conjunction with the SMBus General Call
Address.
The DC (Daisy Chain) pin creates a sub-SMBus/I2C bus where
a multiple of ADT7401’s can be used. The DC pin has the
advantage of freeing up the address options on the root bus as
only one ADT7401 root address needs to be used by the
SMBus/I2C controller but still being able to address a number of
ADT7401 temperature sensors.
PRODUCT HIGHLIGHTS
1. The ADT7401 has an on-chip temperature sensor that
allows an accurate measurement of the ambient
temperature. The measurable temperature range is -40°C
to +150°C.
2. Supply voltage of 2.7 V to 5.5 V.
3. Space-saving 6-lead SOT-23 package and 8-lead MSOP.
4. Temperature accuracy of ±0.5°C.
5. 0.0625°C temperature resolution.
6. The ADT7401 features a one shot mode that reduces the
power consumption to 2.57 µW at one sample per second.
FUNCTIONAL BLOCK DIAGRAM
Figure 1. SOT-23 Functional Block Diagram
Rev. PrE
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
1 page  
Preliminary Technical Data
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Rating
VDD to GND
Digital Input Voltage to GND
Maximum Output Current (OUT)
Operating Temperature Range3
–0.3 V to +7 V
–0.3 V to VDD + 0.3 V
±10 mA
–40°C to +150°C
Storage Temperature Range
–65°C to +160°C
Max Junction Temperature, TJMAX
6-Lead SOT-23
Power Dissipation4
Thermal Impedance6
+150°C
WMAX = (TJMAX - TA5)/θJA
θJA, Junction-to-Ambient
(still air)
229.6°C/W
θJC, Junction-to-Case
8-Lead MSOP (RM-8)
Power Dissipation2
Thermal Impedance4
91.99°C/W
WMAX = (TJMAX - TA3)/θJA
θJA, Junction-to-Ambient
(still air)
θJC, Junction-to-Case
IR Reflow Soldering
Peak Temperature
Time at Peak Temperature
Ramp-up Rate
205.9°C/W
43.74°C/W
+220°C (-0/+5°C)
10 to 20 secs
2-3°C/sec
Ramp-down Rate
–6°C/sec
3 It is not recommended to operate the device at temperatures above +125°C
for greater than a total of 5% of the lifetime of the device. Any exposure
beyond this limit will affect device reliability.
4 Values relate to the package being used on a 2-layer PCB. See Figure 4. for a
plot of max power dissipation vs. ambient temperature (TA).
5 TA = Ambient Temperature.
6 Junction-to-Case resistance is applicable to components featuring a
preferential flow direction, e.g. components mounted on a heat sink.
Junction-to-Ambient resistance is more useful for air-cooled PCB mounted
components.
ADT7401
www.DataSheet4U.com
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Figure 4. Plot of Maximum Power Dissipation vs. Temperature
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. PrE | Page 5 of 12
5 Page 
Preliminary Technical Data
OUTLINE DIMENSIONS
ADT7401
www.DataSheet4U.com
Figure 16. 6-Lead Plastic Surface Mount SOT-23
RT-6)
Dimensions shown in Millimeters
Figure 17. 8-Lead Plastic Surface Mount Mini/Micro SOIC (MSOP)
(RM-8)
Dimensions shown in Millimeters
Rev. PrE | Page 11 of 12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ADT7401.PDF ] | |
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