ADT7488A

Rev. 0 | Page 11 of 16

Command Code Details

ADT7488A Device Identifier Block

The GetDIB() command retrieves the device identifier block

(DIB), which provides information to identify the capabilities of

the ADT7488A. The data returned can be in 8- or 16-byte format.

The full 16 bytes of DIB is detailed in Table 7. The 8-byte format

involves the first eight bytes described in this table. Byte-sized

data is returned in the respective fields as it appears in Table 7.

Word-sized data, including vendor ID, device ID, and data values

use little endian format, that is, the LSB is returned first, followed

by the MSB.

Table 7. 16-Byte DIB Details

Byte

Name

Value

Description

0

Device Capabilities

0xc0

Fixed address device

1

Version/Revision

0x10

Meets Version 1 of the

SST specification

2, 3

Vendor ID

00x11d4

Contains company ID

number in little endian

format

4, 5

Device ID

0x7488

Contains device ID

number in little

endian format

6

Device Interface

0x01

SST device

7

Function

Interface

0x00

Reserved

8

Reserved

0x00

Reserved

9

Reserved

0x00

Reserved

10

Reserved

0x00

Reserved

11

Reserved

0x00

Reserved

12

Reserved

0x00

Reserved

13

Reserved

0x00

Reserved

14

Revision ID

0x05

Contains revision ID

15

Client Device

Address

0x48 to

0x4a

Dependent on the state

of the address pin

Ping()

The Ping() command verifies if a device is responding at a

particular address. The ADT7488A shows a valid nonzero FCS

in response to the Ping() command when correctly addressed.

Table 8. Ping() Command

Target Address

Write Length

Read Length

FCS

(Not necessary)

0x00

0x00

ResetDevice()

This command resets the register map and conversion

controller. The reset command can be global or directed at the

client address of the ADT7488A.

Table 9. ResetDevice() Command

Target Address

Write

Length

Read

Length

Reset

command

FCS

Device Address

0x01

0x00

0xf6

GetIntTemp()

The ADT7488A shows the local temperature of the device in

response to the GetIntTemp() command. The data has a little

endian, 16-bit, twos complement format.

GetExt1Temp()

Prompted by the GetExt1Temp() command, the ADT7488A shows

the temperature of Remote Diode 1 in little endian, 16-bit, twos

complement format. The ADT7488A shows 0x8000 in response

to this command if the external diode is an open or short circuit.

GetExt2Temp()

Prompted by the GetExt2Temp() command, ADT7488A shows

the temperature of Remote Diode 2 in little endian, 16-bit, twos

complement format. The ADT7488A shows 0x8000 in response

to this command if the external diode is an open or short circuit.

GetAllTemps()

The ADT7488A shows the local and remote temperatures

in a 6-byte block of data (internal temperature first, followed by

External 1 temperature, followed by External 2 temperature) in

response to a GetAllTemps() command.

SetExtOffset()

This command sets the offset that the ADT7488A will use to

correct errors in the external diode. The offset is set in little

endian, 16-bit, twos complement format. The maximum offset

is ±128°C with +0.25°C resolution.

GetExtOffset()

This command causes the ADT7488A to show the offset that it

is using to correct errors in the external diode. The offset value

is returned in little endian format, that is, LSB before MSB.

ADT7488A Response to Unsupported Commands

A full list of command codes supported by the ADT7488A is

given in Table 6. The offset registers (Command Code 0xe0) are

the only registers that the user can write to. The other defined

registers are read only. Writing to Register Addresses 0x02,

0x09, and 0x15 to 0xdf shows a valid FSC, but no action is taken

by the ADT7488A. The ADT7488A shows an invalid FSC if the

user attempts to write to the device between Command Codes

0xe2 to 0xee. These registers are reserved for the manufacturer’s

use only, and no data can be written to the device via these

addresses.