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參數資料
| 型號： | ADT7461AR-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | 【1∑C Temperature Monitor with Series Resistance Cancellation |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | MS-012-AA, SOIC-8 |
| 文件頁數： | 1/24頁 |
| 文件大?。?/td> | 854K |
| 代理商： | ADT7461AR-REEL |
±1°C Temperature Monitor with
Series Resistance Cancellation
ADT7461*
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 k (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
Up to 2 overtemperature fail-safe THERM 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
Automotive
Enbedded systems
Burn-in applications
Instrumentation
PRODUCT DESCRIPTION
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 k (typical) of
resistance in series with the temperature monitoring diode may
be automatically cancelled from the temperature result, allowing
noise filtering; configurable ALERT output; and an extended,
switchable temperature measurement range.
The ADT7461 can measure the temperature of a remote ther-
mal diode accurate to ±1°C, and the ambient temperature accu-
rate to ±3°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 55°C to +150°C. The
ADT7461 communicates over a 2-wire serial interface compati-
ble with system management bus (SMBus) standards. An
ALERT output signals when the on-chip or remote temperature
is out of range. 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.
*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.
0
D
D
SCLK
SDATA
GND
V
DD
6
4
ADDREGISTER
LOW LIMIT REGISTER
HIGH LIMIT REGISTER
RLOW LIMIT REGISTER
HIGH LIMIT REGISTER
L
C
LVALUE REGISTER
REVALUE REGISTER
ADC
AMUX
TESENSOR
RUN/STANDBY
BUSY
REREGISTER
EXTERNAL DIODE OPEN-CIRCUIT
ADT7461
STATUS REGISTER
SMBus INTERFACE
LOCREGISTER
EXTERREGISTER
COREGISTER
IMASKING
7
5
1
8
THERM
ALERT/
THERM2
D+
D–
BSRC
2
3
CONREGISTER
Figure 1. Functional Block Diagram
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.
Tel: 781.329.4700Fax: 781.326.8703
www.analog.comRev. 0
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