ADT7488A(2012) データシートの表示（PDF） - ON Semiconductor
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ADT7488A Datasheet PDF : 13 Pages
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ADT7488A
Table 7. 16-BYTE DIB DETAILS
Byte
0
Name
Device
Capabilities
Value
0xc0
1
Version/Revision 0x10
2, 3 Vendor ID
00x11d4
4, 5 Device ID
0x7488
6
Device Interface 0x01
7
Function
Interface
0x00
8
Reserved
0x00
9
Reserved
0x00
10 Reserved
0x00
11 Reserved
0x00
12 Reserved
0x00
13 Reserved
0x00
14 Revision ID
0x05
15 Client Device
Address
0x48 to
0x4a
Description
Fixed Address
Device
Meets Version 1 of
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 Address
Pin
Ping()
The Ping() command verifies if a device is responding at
a particular address. The ADT7488A shows a valid non-zero
FCS in response to the Ping() command when correctly
addressed.
Table 8. PING() COMMAND
Target Address
(Not Necessary)
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 ADT7488A.
Table 9. RESETDEVICE() COMMAND
Target Address
Device Address
Write
Length
0x01
Read
Length
0x00
Reset
Command
0xf6
FCS
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 128C with +0.25C 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.
Voltage Measurement
The ADT7488A has two external voltage measurement
channels. It can also measure its own supply voltage, VCC.
Pins 7 and 8 measure the supplies of the processor core
voltage (VCCP), and 2.5 V pins, respectively. The VCC
supply voltage measurement is carried out through the VCC
pin (Pin 1). The 2.5 V pin can be used to monitor a chip-set
supply voltage in a computer system.
Analog-to-Digital Converter
All analog inputs are multiplexed into the on-chip,
successive approximation, analog-to-digital converter
(ADC). This has a resolution of 10 bits. The basic input
range is 0 V to 2.25 V, but the inputs have built-in
attenuators to allow measurement of 2.5 V, 3.3 V, 5.0 V,
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