ADT7484A(2012) データシートの表示（PDF） - ON Semiconductor
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ADT7484A Datasheet PDF : 14 Pages
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ADT7484A/ADT7486A
Command Code Details
ADT7484A/ADT7486A Device Identifier Block
The GetDIB() command retrieves the device identifier
block (DIB), which provides information to identify the
capabilities of the ADP7484A/ADT7486A. The data
returned can be in 8- or 16-byte format. The full 16-bytes of
DIB is detailed in Table 8. 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 8.
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 8. DIB BYTE DETAILS
Byte
0
1
Name
Device
Capabilities
Version/
Revision
Value
0xc0
0x10
2, 3 Vendor ID
00x11d4
4, 5 Device ID
6 Device
Interface
7 Function
Interface
8 Reserved
9 Reserved
10 Reserved
11 Reserved
12 Reserved
13 Reserved
14 Revision ID
15 Client Device
Address
0x7484
or
0x7486
0x01
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x05
0x48 to
0x50
Description
Fixed Address Device
Meets Version 1 of
the SST Specification
Contains Company ID
Number in Little
Endian Format
Contains Device ID
Number in Little
Endian Format
SST Device
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Contains Revision ID
Dependent on the
State of the Address
Pins
Ping()
The Ping() command verifies if a device is responding at
a particular address. The ADT7484A/ADT7486A show a
valid nonzero FCS in response to the Ping() command when
correctly addressed.
Table 9. PING() COMMAND
Target Address
Device Address
Write Length
0x00
Read Length
0x00
FCS
ResetDevice()
This command resets the register map and conversion
controller. The reset command can be global or directed at
the client address of the ADT7484A/ADT7486A.
Table 10. RESET DEVICE() COMMAND
Target Address
Device Address
Write
Length
0x01
Read
Length
0x00
Reset
Command
0xf6
FCS
GetIntTemp()
The ADT7484A/ADT7486A show the local temperature
of the device in response to the GetIntTemp() command. The
data has a little endian, 16-bit, twos complement format.
GetExtTemp()
Prompted by the GetExtTemp() command, the
ADT7484A/ADT7486A show the temperature of the
remote diode in little endian, 16-bit, twos complement
format. The ADT7484A/ADT7486A show 0x8000 in
response to this command if the external diode is an open or
short circuit.
GetAllTemps()
The ADT7484A shows the local and remote temperatures
in a 4-byte block of data (internal temperature first, followed
by External Temperature 1) in response to a GetAllTemps()
command. The ADT7486A shows the local and remote
temperatures in a 6-byte block of data (internal temperature
first, followed by External Temperature 1 and External
Temperature 2) in response to this command.
SetExtOffset()
This command sets the offset that the ADT7484A/
ADT7486A 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 128C with +0.25C
resolution.
GetExtOffset()
This command causes the ADT7484A/ADT7486A to
show the offset that they are using to correct errors in the
external diode. The offset value is returned in little endian
format, that is, LSB before MSB.
ADT7484A/ADT7486A Response to Unsupported
Commands
A full list of command codes supported by the
ADT7484A/ADT7486A is given in Table 7. The offset
registers (Command Codes 0xe0 and 0xe1) are the only
registers that the user can write to. The other defined
registers are read only. Writing to Register Addresses 0x03
to 0xdf shows a valid FSC, but no action is taken by the
ADT7484A/ADT7486A. The ADT7484A/ADT7486A
show an invalid FSC if the user attempts to write to the
devices between Command Codes 0xe2 to 0xee and no data
is written to the device. These registers are reserved for the
manufacturer’s use only, and no data can be written to the
device via these addresses.
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