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PDF ADT7481 Data sheet ( Hoja de datos )
| Número de pieza | ADT7481 | |
| Descripción | Dual Channel Temperature Sensor and Over Temperature Alarm | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Dual Channel Temperature Sensor
and Over Temperature Alarm
ADT7481
FEATURES
1 local and 2 remote temperature sensors
0.25°C resolution/1°C accuracy on remote channels
1°C resolution/1°C accuracy on local channel
Extended, switchable temperature measurement range 0°C
to 127°C (default) or –64°C to +191°C
2-wire SMBus serial interface with SMBus ALERT support
Programmable over/under temperature limits
Offset registers for system calibration
Up to 2 over temperature fail-safe THERM outputs
Small 10-lead MSOP package
240 μA operating current, 5 μA standby current
GENERAL DESCRIPTION
The ADT74811 is a 3-channel digital thermometer and under/
over temperature alarm, intended for use in PCs and thermal
management systems. It can measure its own ambient temperature
or the temperature of two remote thermal diodes. These thermal
diodes can be located in a CPU or GPU, or they can be discrete
diode connected transistors. The ambient temperature, or the
temperature of the remote thermal diode, can be accurately
measured to ±1°C. The temperature measurement range defaults
to 0°C to +127°C, compatible with ADM1032, but can be
switched to a wider measurement range from −64°C to +191°C.
APPLICATIONS
Desktop and notebook computers
Industrial controllers
Smart batteries
Automotive
Embedded systems
Burn-in applications
Instrumentation
The ADT7481 communicates over a 2-wire serial interface
compatible with system management bus (SMBus) standards.
The SMBus address of the ADT7481 is 0x4C. An ADT7481-1
with an SMBus address of 0x4B is also available.
An ALERT output signals when the on-chip or remote
temperature is outside the programmed limits. The THERM
output is a comparator output that allows, for example, on/off
control of a cooling fan. The ALERT output can be reconfigured
as a second THERM output if required.
FUNCTIONAL BLOCK DIAGRAM
D1+ 2
D1– 3
D2+ 7
D2– 8
ON-CHIP TEMP
SENSOR
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
VALUE REGISTER
ANALOG
MUX
11-BIT A-TO-D
CONVERTER
BUSY RUN/STANDBY
REMOTE 1 AND 2 TEMP
VALUE REGISTERS
REMOTE 1 AND 2 TEMP
OFFSET REGISTERS
EXTERNAL DIODES OPEN-CIRCUIT
ADT7481
STATUS REGISTERS
SMBUS INTERFACE
ADDRESS POINTER
REGISTER
ONE-SHOT
REGISTER
LOCAL TEMPERATURE
THERM LIMIT REGISTER
LOCAL TEMPERATURE
LOW LIMIT REGISTER
LOCAL TEMPERATURE
HIGH LIMIT REGISTER
REMOTE 1 AND 2 TEMP
THERM LIMIT REGISTER
REMOTE 1 AND 2 TEMP
LOW LIMIT REGISTERS
REMOTE 1 AND 2 TEMP
HIGH LIMIT REGISTERS
CONFIGURATION
REGISTERS
INTERRUPT
MASKING
8 ALERT/THERM2
1
VDD
6
GND
9
SDATA
10
SCLK
Figure 1.
4
THERM
1 Protected by U.S. Patents 5,195,827; 5,867,012, 5,982,221; 6,097,239; 6,133,753; 6,169,442, other patents pending.
Rev. 0
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: 781.461.3113
©2005 Analog Devices, Inc. All rights reserved.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Positive Supply Voltage (VDD) to GND
D+
D− to GND
SCLK, SDATA, ALERT, THERM
Input Current, SDATA, THERM
Input Current, D−
ESD Rating, All Pins (Human Body Model)
Maximum Junction Temperature (TJMAX)
Storage Temperature Range
IR Reflow Peak Temperature
IR Reflow Peak Temperature for Pb-Free
Lead Temperature (Soldering 10 sec)
Rating
−0.3 V to +3.6 V
−0.3 V to VDD + 0.3 V
−0.3 V to +0.6 V
−0.3 V to +3.6 V
−1 mA to +50 mA
±1 mA
1500 V
150°C
−65°C to +150°C
220°C
260°C
300°C
ADT7481
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.
THERMAL CHARACTERISTICS
10-lead MSOP package:
θJA = 142°C/W.
θJC = 43.74°C/W.
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. 0 | Page 5 of 24
5 Page 
ADT7481
Table 7. Temperature Data Format (Local and Remote Temperature High Byte)
Temperature
Binary
−55°C
0 000 00002
0°C 0 000 0000
+1°C
0 000 0001
+10°C
0 000 1010
+25°C
0 001 1001
+50°C
0 011 0010
+75°C
0 100 1011
+100°C
0 110 0100
+125°C
0 111 1101
+127°C
+150°C
0 111 1111
0 111 11113
Offset Binary1
0 000 1001
0 100 0000
0 100 0001
0 100 1010
0 101 1001
0 111 0010
1 000 1011
1 010 0100
1 011 1101
1 011 1111
1 101 0110
1 Offset binary scale temperature values are offset by +64.
2 Binary scale temperature measurement returns 0 for all temperatures <0°C.
3 Binary scale temperature measurement returns 127 for all temperatures >127°C.
The user may switch between measurement ranges at any time.
Switching the range will also switch the data format. The next
temperature result following the switching will be reported back
to the register in the new format. However, the contents of the
limit registers will not change. It is up to the user to ensure that
when the data format changes, the limit registers are repro-
grammed as necessary. More information on this can be found
in the Limit Registers section.
Rev. 0 | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADT7481.PDF ] | |
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