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Analog Devices - Dual Channel Temperature Sensor and Overtemperature Alarm

Numéro de référence ADT7482
Description Dual Channel Temperature Sensor and Overtemperature Alarm
Fabricant Analog Devices 
Logo Analog Devices 





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Dual Channel Temperature Sensor
and Overtemperature Alarm
ADT7482
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
Automatically cancels up to 1.5 kΩ (typ) of resistance in
series with the remote sensors
Extended, switchable temperature measurement range 0°C
to +127°C (default) or −55°C to +150°C
2-wire SMBus serial interface with SMBus alert support
Programmable overtemperature/undertemperature limits
Offset registers for system calibration
Up to 2 overtemperature fail-safe THERM outputs
Small, 10-lead MSOP package
240 μA operating current, 5 μA standby current
APPLICATIONS
Desktop and notebook computers
Industrial controllers
Smart batteries
Automotive
Embedded systems
Burn-in applications
Instrumentation
GENERAL DESCRIPTION
The ADT74821 is a three-channel digital thermometer and
undertemperature/overtemperature alarm for PCs and thermal
management systems. It can measure the temperature in two
remote locations, such as in the remote thermal diode in a CPU
or GPU, or using a discrete diode connected transistor. This
device also measures its own ambient temperature.
One feature of the ADT7482 is series resistance cancellation
where up to 1.5 kΩ (typical) of resistance in series with each of
the temperature monitoring diodes can be automatically
cancelled from the temperature result, allowing noise filtering.
The temperature of the remote thermal diodes and ambient
temperature can be measured accurate to ±1°C. The tempera-
ture measurement range, which defaults to 0°C to 127°C, can be
switched to a wider measurement range of from −55°C to +150°C.
The ADT7482 communicates over a 2-wire serial interface
compatible with system management bus (SMBus) standards.
The default address of the ADT7482 is 0x4C. 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 on/off control of a cooling fan. The ALERT output can
be reconfigured as a second THERM output if required.
1 Protected by U.S. Patents 5,195,827, 5,867,012, 5,982,221, 6,097,239,
6,133,753, 6,169,442, 7,010,440, other patents pending.
FUNCTIONAL BLOCK DIAGRAM
D1+ 2
D1– 3
D2+ 7
D2– 6
ON-CHIP
TEMPERATURE
SENSOR
ANALOG
MUX
SRC
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
VALUE REGISTER
11-BIT ADC
BUSY
RUN/STANDBY
REMOTE 1 AND 2 TEMP
VALUE REGISTERS
REMOTE 1 AND 2 TEMP
VALUE REGISTERS
EXTERNAL DIODES OPEN-CIRCUIT
ADT7482
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 REGISTERS
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
5
GND
9
SDATA
Figure 1.
10
SCLK
4
THERM
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
©2006 Analog Devices, Inc. All rights reserved.

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