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ADT7461AARMZ Arkusz danych(PDF) 3 Page - Analog Devices

Numer części ADT7461AARMZ
Szczegółowy opis  짹1째C Temperature Monitor with Series Resistance Cancellation
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Strona internetowa  http://www.analog.com
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ADT7461A
Rev. A | Page 3 of 24
GENERAL DESCRIPTION
The ADT7461A1 is a dual-channel digital thermometer and
undertemperature/overtemperature alarm, intended for use in
PCs and thermal management systems. It is pin- and register-
compatible with the ADM1032 and the ADT7461. A feature of the
ADT7461A is series resistance cancellation, where up to 1.5 kΩ
(typical) of resistance in series with the temperature monitoring
diode can be automatically cancelled from the temperature result,
allowing noise filtering. The ADT7461A has a configurable
ALERT output and an extended, switchable temperature meas-
urement range.
The ADT7461A can measure the temperature of a remote
thermal diode accurate to ±1°C and the ambient temperature
accurate to ±3°C. The temperature measurement range defaults
to 0°C to +127°C, compatible with the ADM1032, but it can be
switched to a wider measurement range of −64°C to +191°C.
The ADT7461A communicates over a 2-wire serial interface,
compatible with system management bus (SMBus) standards.
The default SMBus address of the ADT7461A is 0x4C. An
ADT7461A-2 is available with an SMBus address of 0x4D. This
is useful if more than one ADT7461A is used on the same SMBus.
An ALERT output signals when the on-chip or remote tempera-
ture 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.
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.
DIFFERENCES BETWEEN THE ADT7461A AND THE
ADT7461
Although the ADT7461A is pin- and register-compatible with
the ADT7461, there are some specification differences between
the two devices. A summary of these differences is shown in
Table 1.
Table 1. Differences Between the ADT7461A and the ADT7461
Specification
ADT7461A
ADT7461
Unit
Supply Voltage
3 to 3.6
3 to 5.5
V
Maximum Local Sensor
Accuracy
1
3
°C
Maximum Series Resistance
Cancellation
1.5
3
k
Average Operating Supply
Current
16 Conversions/sec
240
170
μA
Standby Mode
5
5.5
μA
Maximum Conversion Time
One Shot, Averaging On
52
114.6
ms
One Shot, Averaging Off
8
12.56
ms
Remote Sensor Current Levels
High
220
96
μA
Mid
82
36
μA
Low
13.5
6
μA


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