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ADT7482

更新时间： 2024-11-23 04:04:47
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亚德诺 - ADI 传感器温度传感器
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24页 533K
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Dual Channel Temperature Sensor and Overtemperature Alarm

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Dual Channel Temperature Sensor  
and Overtemperature Alarm  
ADT7482  
FEATURES  
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.  
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  
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.  
2-wire SMBus serial interface with SMBus alert support  
Programmable overtemperature/undertemperature limits  
Offset registers for system calibration  
THERM  
Up to 2 overtemperature fail-safe  
Small, 10-lead MSOP package  
outputs  
240 μA operating current, 5 μA standby current  
APPLICATIONS  
Desktop and notebook computers  
Industrial controllers  
Smart batteries  
The ADT7482 communicates over a 2-wire serial interface  
compatible with system management bus (SMBus) standards.  
ALERT  
The default address of the ADT7482 is 0x4C. An  
signals when the on-chip or remote temperature is outside the  
THERM  
output  
Automotive  
Embedded systems  
Burn-in applications  
Instrumentation  
programmed limits. The  
output is a comparator output  
ALERT  
that allows on/off control of a cooling fan. The  
output can  
output if required.  
THERM  
be reconfigured as a second  
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  
ADDRESS POINTER  
REGISTER  
ONE-SHOT  
REGISTER  
ON-CHIP  
TEMPERATURE  
SENSOR  
CONVERSION RATE  
REGISTER  
LOCAL TEMPERATURE  
THERM-LIMIT REGISTER  
LOCAL TEMPERATURE  
VALUE REGISTER  
LOCAL TEMPERATURE  
LOW-LIMIT REGISTER  
2
3
D1+  
D1–  
LOCAL TEMPERATURE  
HIGH-LIMIT REGISTER  
ANALOG  
MUX  
11-BIT ADC  
SRC  
7
6
D2+  
D2–  
REMOTE 1 AND 2 TEMP  
THERM-LIMIT REGISTERS  
BUSY  
RUN/STANDBY  
REMOTE 1 AND 2 TEMP  
VALUE REGISTERS  
REMOTE 1 AND 2 TEMP  
LOW-LIMIT REGISTERS  
REMOTE 1 AND 2 TEMP  
HIGH-LIMIT REGISTERS  
REMOTE 1 AND 2 TEMP  
VALUE REGISTERS  
CONFIGURATION  
REGISTERS  
EXTERNAL DIODES OPEN-CIRCUIT  
INTERRUPT  
MASKING  
8
ALERT/THERM2  
STATUS REGISTERS  
ADT7482  
SMBus INTERFACE  
1
5
9
10  
4
V
GND  
SDATA  
SCLK  
THERM  
DD  
Figure 1.  
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 registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2006 Analog Devices, Inc. All rights reserved.  
 
 
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