ADT7484A 查看數據表（PDF） - ON Semiconductor

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ADT7484A

Digital Temperature Sensor with SST Interface

ON Semiconductor 

ADT7484A/ADT7486A

Product Description

The ADT7484A is a single remote temperature sensor,

and the ADT7486A is a dual temperature sensor for use in

PC applications. The ADT7484A/ADT7486A accurately

measure local and remote temperature and communicate

over a one-wire Simple Serial Transport (SST) bus interface.

SST Interface

Simple Serial Transport (SST) is a one-wire serial bus and

a communications protocol between components intended

for use in personal computers, personal handheld devices, or

other industrial sensor nets. The ADT7484A/ADT7486A

support SST specification Rev 1.

SST is a licensable bus technology from Analog Devices,

Inc., and Intel Corporation. To inquire about obtaining a

copy of the Simple Serial Transport Specification or an SST

technology license, please email Analog Devices, at

sst_licensing@analog.com or write to Analog Devices,

3550 North First Street, San Jose, CA 95134, Attention: SST

Licensing, M/S B7-24.

ADT7484A/ADT7486A Client Address

The client address for the ADT7484A/ADT7486A is

selected using the address pin. The address pin is connected

to a float detection circuit, which allows the ADT7484A/

ADT7486A to distinguish between three input states: high,

low (GND), and floating. The address range for fixed

address, discoverable devices is 0x48 to 0x50.

Table 1. ADT7484A/ADT7486A Selectable Addresses

ADD1

ADD0

Address Selected

Low (GND)

Low (GND)

Low (GND)

Float

Float

Float

High

High

High

Low (GND)

Float

High

Low (GND)

Float

High

Low (GND)

Float

High

0x48

0x49

0x4A

0x4B

0x4C

0x4D

0x4E

0x4F

0x50

Command Summary

Table 7 summarizes the commands supported by the

ADT7484A/ADT7486A devices when directed at the target

address selected by the fixed address pins. It contains the

command name, command code (CC), write data length

(WL), read data length (RL), and a brief description.

Table 2. Command Code Summary

Command

Command

Code, CC

Write Length,

WL

Ping()

0x00

0x00

GetIntTemp()

0x00

0x01

GetExt1Temp()

GetExt2Temp()

0x01

0x02

0x01

0x01

GetAllTemps()

0x00

0x01

SetExt1Offset()

GetExt1Offset()

SetExt2Offset()

GetExt2Offset()

ResetDevice()

0xe0

0xe0

0xe1

0xe1

0xf6

0x03

0x01

0x03

0x01

0x01

GetDIB()

0xf7

0x01

0xf7

0x01

Read Length, RL

0x00

0x02

0x02

0x02

0x04 (ADT7484A)

0x06 (ADT7486A)

0x00

0x02

0x00

0x02

0x00

0x08

0x10

Description

Shows a nonzero FCS over the header if present.

Shows the temperature of the device’s internal thermal

diode.

Shows the temperature of External Thermal Diode 1.

Shows the temperature of External Thermal Diode 2

(ADT7486A only).

Shows a 4- or 6-byte block of data (ADT7484A:

GetIntTemp, GetExt1Temp; ADT7486A: GetIntTemp,

GetExt1Temp, GetExt2Temp).

Sets the offset used to correct errors in External Diode 1.

Shows the offset that the device is using to correct errors

in External Diode 1.

Sets the offset used to correct errors in External Diode 2

(ADT7486A only).

Shows the offset that the device is using to correct errors

in External Diode 2 (ADT7486A only).

Functional reset. The ADT7484A/ADT7486A also re-

spond to this command when directed to the Target Ad-

dress 0x00.

Shows information used by SW to identify the device’s

capabilities. Can be in 8- or 16-byte format.

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