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PDF ADT7486A Data sheet ( Hoja de datos )
| Número de pieza | ADT7486A | |
| Descripción | (ADT7484A / ADT7486A) Digital Temperature Sensor | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
1 on-chip temperature sensor
1 or 2 remote temperature sensors
Simple Serial Transport™ (SST™) interface Rev 1 compliant
APPLICATIONS
Personal computers
Portable personal devices
Industrial sensor nets
Digital Temperature Sensor
with SST Interface
ADT7484A/ADT7486A
GENERAL DESCRIPTION
The ADT7484A/ADT7486A are simple digital temperature sensors
for use in PC applications with a Simple Serial Transport (SST)
interface. These devices can monitor their own temperature as
well as the temperature of one (ADT7484A) or two (ADT7486A)
remote sensor diodes. The ADT7484A/ADT7486A are controlled
by a single SST bidirectional data line. The devices are fixed-
address SST clients where the target address is chosen by the
state of the two address pins, ADD0 and ADD1.
FUNCTIONAL BLOCK DIAGRAM
(ADT7486A ONLY)
D1+
D1–
D2+
D2–
ON-CHIP
TEMPERATURE
SENSOR
LOCAL TEMPERATURE
VALUE REGISTER
ANALOG MUX
A/D
CONVERTER
REMOTE TEMPERATURE
VALUE REGISTER
ADT7484A/
ADT7486A
OFFSET REGISTERS
VDD GND
Figure 1.
RESERVED
SST INTERFACE
SST
ADDRESS
SELECTION
ADD1
ADD0
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 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
3.6 V
3.6 V
±5 mA
±20 mA
150°C
−65°C to +150°C
260°C
300°C
1500 V
ADT7484A/ADT7486A
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
8-Lead MSOP (ADT7484A) 206
10-Lead MSOP (ADT7486A) 206
θJC Unit
44 °C/W
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
ADT7484A/ADT7486A Device Identifier Block
The GetDIB() command retrieves the device identifier block
(DIB), which provides information to identify the capabilities of
the ADT7484A/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 Name
Value
0 Device Capabilities 0xc0
1 Version/Revision 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 Write Length
Device Address
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. ResetDevice() Command
Write
Target Address Length
Read
Length
Device Address 0x01
0x00
Reset
command
0xf6
FCS
ADT7484A/ADT7486A
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 tem-
peratures 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 ±128°C with +0.25°C 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.
Rev. 0 | Page 11 of 16
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADT7486A.PDF ] | |
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