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ADT7461ARM-REEL7 PDF预览

ADT7461ARM-REEL7

更新时间: 2024-11-03 22:36:27
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亚德诺 - ADI 模拟IC信号电路光电二极管
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24页 805K
描述
【1∑C Temperature Monitor with Series Resistance Cancellation

ADT7461ARM-REEL7 数据手册

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± ±1°C TemTꢀratꢀTCꢁMonaMꢀCꢂnaꢃ  
STꢀnTsCRTsnsarocTC°rocTllranMo  
C
AD 746±*  
PRODUCT DESCRIPTION  
FEATURES  
On-chip and remote temperature sensor  
0.25°C resolution/1°C accuracy on remote channel  
1°C resolution/3°C accuracy on local channel  
Automatically cancels up to 3 kΩ (typ) of resistance in series  
with remote diode to allow noise filtering  
Extended, switchable temperature measurement range 0°C  
to +127°C (default) or –55°C to +150°C  
Pin and register compatible with ADM1032  
2-wire SMBus serial interface with SMBus alert support  
Programmable over/under temperature limits  
Offset registers for system calibration  
The ADT7461 is a dual-channel digital thermometer and  
under/over temperature alarm, intended for use in PCs and  
thermal management systems. It is pin and register compatible  
with the ADM1032. The ADT7461 has three additional features:  
series resistance cancellation, where up to 3 kΩ (typical) of  
resistance in series with the temperature monitoring diode may  
be automatically cancelled from the temperature result, allowing  
ALERT  
noise filtering; configurable  
output; and an extended,  
switchable temperature measurement range.  
The ADT7461 can measure the temperature of a remote ther-  
mal diode accurate to 1ꢀC, and the ambient temperature accu-  
rate to 3ꢀC. The temperature measurement range defaults to  
0ꢀC to +127ꢀC, compatible with ADM1032, but can be switched  
to a wider measurement range, from −55ꢀC to +150ꢀC. The  
ADT7461 communicates over a 2-wire serial interface compati-  
ble with system management bus (SMBus) standards. An  
THERM  
Up to 2 overtemperature fail-safe  
outputs  
Small 8-lead SOIC or MSOP package  
170 µA operating current, 5.5 µA standby current  
APPLICATIONS  
Desktop and notebook computers  
Industrial controllers  
Smart batteries  
ALERT  
output signals when the on-chip or remote temperature  
THERM  
is out of range. The  
output is a comparator output that  
ALERT  
Automotive  
allows on/off control of a cooling fan. The  
output can  
Enbedded systems  
Burn-in applications  
Instrumentation  
THERM  
be reconfigured as a second  
output if required.  
*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.  
CONVERSION RATE  
ADDRESS POINTER  
REGISTER  
REGISTER  
ON-CHIP  
TEMPERATURE  
SENSOR  
LOCAL TEMPERATURE  
LOW LIMIT REGISTER  
LOCAL TEMPERATURE  
VALUE REGISTER  
LOCAL TEMPERATURE  
HIGH LIMIT REGISTER  
ANALOG  
MUX  
ADC  
REMOTE TEMPERATURE  
LOW LIMIT REGISTER  
BUSY  
RUN/STANDBY  
REMOTE TEMPERATURE  
HIGH LIMIT REGISTER  
D+  
D–  
REMOTE TEMPERATURE  
VALUE REGISTER  
2
3
SRC  
BLOCK  
LOCAL THERM LIMIT  
REGISTER  
REMOTE OFFSET  
REGISTER  
EXTERNAL THERM LIMIT  
REGISTER  
CONFIGURATION  
REGISTER  
EXTERNAL DIODE OPEN-CIRCUIT  
INTERRUPT  
STATUS REGISTER  
MASKING  
ADT7461  
SMBus INTERFACE  
6
4
1
5
7
8
V
GND  
SDATA  
SCLK  
THERM  
ALERT/  
DD  
THERM2  
Figure 1. Functional Block Diagram  
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  
Fax: 781.326.8703  
www.analog.com  
© 2003 Analog Devices, Inc. All rights reserved.  

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