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PDF ADT7483A Data sheet ( Hoja de datos )
| Número de pieza | ADT7483A | |
| 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
ADT7483A
FEATURES
GENERAL DESCRIPTION
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 overtemperature fail-safe THERM outputs
Small 16-lead QSOP package
240 μA operating current, 5 μA standby current
The ADT7483A1 is a three-channel digital thermometer and
under/over temperature alarm, intended for use in PCs and
thermal management systems. It can measure the temperature
in two remote locations, for example, the remote thermal diode
in a CPU or GPU, or a discrete diode connected transistor. It can
also measure its own ambient temperature. The temperature of the
remote thermal diode and ambient temperature 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.
The ADT7483A communicates over a 2-wire serial interface
APPLICATIONS
Desktop and notebook computers
Industrial controllers
Smart batteries
Automotive
Embedded systems
Burn-in applications
Instrumentation
compatible with system management bus (SMBus) standards.
The SMBus address is set by the ADD0 and ADD1 pins. As
many as nine different SMBus addresses are possible.
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+ 3
D1– 4
D2+ 12
D2– 11
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
ADT7483A
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
13 ALERT/THERM2
2
VDD
6
GND
16 1
14 15
ADD0 ADD1 SDATA SCLK
5
THERM
Figure 1.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
Rating
Positive Supply Voltage (VDD) to GND
D+
D− to GND
−0.3 V, +3.6 V
−0.3 V to VDD + 0.3 V
−0.3 V to +0.6 V
SCLK, SDATA, ALERT, THERM
−0.3 V to +3.6 V
Input Current, SDATA, THERM
−1 mA, +50 mA
Input Current, D−
ESD Rating, All Pins (Human Body Model)
Maximum Junction Temperature (TJ MAX)
Storage Temperature Range
±1 mA
1,500 V
150°C
−65°C to +150°C
IR Reflow Peak Temperature
220°C
IR Reflow Peak Temperature Pb-Free
260°C
Lead Temperature (Soldering 10 sec)
300°C
ADT7483A
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
16-lead QSOP package:
θJA = 150°C/W
θJC = 38.8°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 
ADT7483A
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
0 111 1111
+150°C
0 111 11113
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.
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
The user may switch between measurement ranges at any time.
Switching the range also switches the data format. The next
temperature result following the switching is reported back to
the register in the new format. However, the contents of the
limit registers do not change. It is up to the user to ensure that
when the data format changes, the limit registers are
reprogrammed as necessary (for more information, see the
Limit Registers section).
REGISTERS
The registers in the ADT7483A are eight bits wide. These
registers are used to store the results of remote and local
temperature measurements, and high and low temperature
limits, and to configure and control the device. A description of
these registers is provided in this section.
Address Pointer Register
The address pointer register does not have, nor does it require,
an address because the first byte of every write operation is
automatically written to this register. The data in this first byte
always contains the address of another register on the ADT7483A,
which is stored in the address pointer register. It is to this other
register address that the second byte of a write operation is
written, or to which a subsequent read operation is performed.
The power-on default value of the address pointer register is
0x00, so if a read operation is performed immediately after
power-on without first writing to the address pointer, the value
of the local temperature will be returned, since its register
address is 0x00.
Temperature Value Registers
The ADT7483A has five registers to store the results of local
and remote temperature measurements. These registers can
only be written to by the ADC and can be read by the user over
the SMBus.
• The local temperature value register is at Address 0x00.
• The Remote 1 temperature value high byte register is
at Address 0x01, with the Remote 1 low byte register at
Address 0x10.
• The Remote 2 temperature value high byte register is
at Address 0x30, with the Remote 2 low byte register
at Address 0x33.
• The Remote 2 temperature values can be read from
Address 0x01 for the high byte and Address 0x10 for
the low byte if Bit 3 of Configuration Register 1 is set to 1.
• To read the Remote 1 temperature values, Bit 3 of
Configuration Register 1 should be set to 0.
• The power-on default for all five registers is 0x00.
Rev. 0 | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADT7483A.PDF ] | |
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