ADT7461AARMZ-REEL 데이터 시트보기 (PDF) - Analog Devices

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ADT7461AARMZ-REEL

±1°C Temperature Monitor with Series Resistance Cancellation

Analog Devices 

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.

ADT7461A

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

1

Accuracy

3

°C

Maximum Series Resistance 1.5

3

kΩ

Cancellation

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

Rev. A | Page 3 of 24

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