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PDF ADT7485A Data sheet ( Hoja de datos )
| Número de pieza | ADT7485A | |
| Descripción | SST Digital Temperature Sensor and Voltage Monitor | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
1 on-chip temperature sensor
1 remote temperature sensor
Monitors up to 5 voltages
Simple Serial Transport™ (SST™) interface
APPLICATIONS
Personal computers
Portable personal devices
Industrial sensor nets
SST Digital Temperature Sensor
and Voltage Monitor
ADT7485A
GENERAL DESCRIPTION
The ADT7485A is a digital temperature sensor and voltage
monitor for use in PC applications with a Simple Serial Transport
(SST) interface. It can monitor its own temperature as well as
the temperature of a remote sensor diode. It can also monitor
four external voltage channels and its own supply voltage. The
ADT7485A is controlled by a single SST bidirectional data line.
This device is a fixed-address SST client where the target address
is chosen by the state of the address pin, ADD.
FUNCTIONAL BLOCK DIAGRAM
VCC
12V
5V
VCCP
2.5V
D1+
D1–
ON-CHIP
TEMPERATURE
SENSOR
ADT7485A
INPUT
ATTENUATORS
AND
ANALOG
MULTIPLEXER
TEMPERATURE
VALUE REGISTERS
A/D
CONVERTER
VOLTAGE
VALUE REGISTERS
GND
Figure 1.
OFFSET REGISTERS
SST INTERFACE
SST
ADDRESS
SELECTION
ADD
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
1 page  
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ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage (VCC)
Voltage on 12V Pin
Voltage on 5V Pin
Voltage on 2.5V and VCCP Pins
Voltage on Any Other Pin (Including SST Pin)
Input Current at Any Pin
Package Input Current
Maximum Junction Temperature (TJ max)
Storage Temperature Range
Lead Temperature, Soldering
IR Peak Reflow Temperature
Lead Temperature (10 sec)
ESD Rating
Rating
4V
16 V
7V
3.6 V
−0.3 V to +3.6 V
±5 mA
±20 mA
150°C
−65°C to +150°C
260°C
300°C
1500 V
ADT7485A
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type
θJA
10-Lead MSOP
206
θJC Unit
44 °C/W
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. 0 | Page 5 of 16
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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.
Table 7. 16-Byte DIB Details
Byte Name
Value
0 Device Capabilities 0xc0
1 Version/Revision 0x10
2, 3 Vendor ID
00x11d4
4, 5 Device ID
0x7485
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 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 pin
Ping()
The Ping() command verifies if a device is responding at a
particular address. The ADT7485A shows a valid nonzero FCS
in response to the Ping() command when correctly addressed.
Table 8. Ping() Command
Target Address Write Length
(Not necessary)
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 ADT7485A.
Table 9. ResetDevice() Command
Write
Target Address Length
Read
Length
Device Address 0x01
0x00
Reset
command
0xf6
FCS
ADT7485A
GetIntTemp()
The ADT7485A shows 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 ADT7485A shows
the temperature of the remote diode in little endian, 16-bit, twos
complement format. The ADT7485A shows 0x8000 in response
to this command if the external diode is an open or short circuit.
GetAllTemps()
The ADT7485A shows the local and remote temperatures in a
4-byte block of data (internal temperature first, followed by external
temperature) in response to a GetAllTemps() command.
SetExtOffset()
This command sets the offset that the ADT7485A 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 ADT7485A 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.
ADT7485A Response to Unsupported Commands
A full list of command codes supported by the ADT7485A 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 ADT7485A. The ADT7485A 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.
Rev. 0 | Page 11 of 16
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADT7485A.PDF ] | |
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