ADT7485A
http://onsemi.com
7
Product Description
The ADT7485A is a temperature- and voltage-monitoring
device. The ADT7485A can monitor the temperature of one
remote sensor diode, plus its own internal temperature. It can
also monitor up to five voltage channels, including its own
supply voltage.
SST Interface
SST is a one-wire serial bus and a communications
protocol between components intended for use in personal
computers, personal hand-held devices, or other industrial
sensor nets. The ADT7485A supports SST Rev 1.0.
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 B724.
ADT7485A Client Address
The client address for the ADT7485A is selected using the
address pin. The address pin is connected to a float detection
circuit, which allows the ADT7485A to distinguish between
three input states: high, low (GND), and floating. The
address range for the fixed address, discoverable device is
0x48 to 0x4A.
Table 5. ADT7485A SELECTABLE ADDRESSES
ADD
Address Selected
Low (GND)
0x48
Float
0x49
High
0x4A
Command Summary
Table 6 summarizes the commands supported by the
ADT7485A device when directed at the target address
selected by the fixed address pin. It contains the command
name, command code (CC), write data length (WL), read
data length (RL), and a brief description.
Table 6. COMMAND CODE SUMMARY
Command
Command
Code, CC
Write
Length, WL
Read
Length, RL
Description
Ping()
0x00
0x00
0x00
Shows a nonzero FCS over the header if present.
GetIntTemp()
0x00
0x01
0x02
Shows the temperature of the devices internal thermal diode.
GetExtTemp()
0x01
0x01
0x02
Shows the temperature of External Thermal Diode.
GetAllTemps()
0x00
0x01
0x04
Returns a 4-byte block of data (GetIntTemp, GetExt1Temp).
GetVolt12V()
0x10
0x01
0x02
Shows the voltage attached to 12 V input.
GetVolt5V()
0x11
0x01
0x02
Shows the voltage attached to 5.0 V input.
GetVoltVCC()
0x12
0x01
0x02
Shows the voltage attached to V
CC
input.
GetVolt2.5V()
0x13
0x01
0x02
Shows the voltage attached to 2.5 V input.
GetVoltVCCP()
0x14
0x01
0x02
Shows the voltage attached to V
CCP
input.
GetAllVolts()
0x10
0x01
0x10
Shows all voltage measurement values.
SetExtOffset()
0xe0
0x02
0x00
Sets the offset used to correct errors in External Diode.
GetExtOffset()
0xe0
0x01
0x01
Shows the offset that the device is using to correct errors in
External Diode.
ResetDevice()
0xf6
0x01
0x00
Functional reset. The ADT7485A also responds to this
command when directed to the Target Address 0x00.
GetDIB()
0xf7
0xf7
0x01
0x01
0x08
0x10
Shows information used by SW to identify the devices
capabilities. Can be in 8- or 16-byte format.
Command Code Details
ADT7485A Device Identifier Block
The GetDIB() command retrieves the device identifier
block (DIB), which provides information to identify the
capabilities of the ADT7485A. 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.
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