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PDF ADT7488A Data sheet ( Hoja de datos )
| Número de pieza | ADT7488A | |
| Descripción | SST Digital Temperature Sensor and Voltage Monitor | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
1 on-chip temperature sensor
2 remote temperature sensors
Monitors 3 voltage inputs, including VCC
Simple Serial Transport™ (SST™) interface
APPLICATIONS
Personal computers
Portable personal devices
Industrial sensor nets
SST Digital Temperature Sensor
and Voltage Monitor
ADT7488A
GENERAL DESCRIPTION
The ADT7488A is a simple digital temperature sensor for use in
PC applications with Simple Serial Transport (SST) interface. It
can monitor its own temperature as well as the temperature of
two remote sensor diodes. It also measures the processor core
voltage, VCCP; a 2.5 V supply voltage; and its own supply voltage,
VCC. The ADT7488A is controlled by an SST single
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
ON-CHIP
TEMPERATURE
SENSOR
ADT7488A
OFFSET REGISTERS
VCC
D1+
D1–
D2+
D2–
VCCP
2.5V
INPUT
ATTENUATORS
AND
ANALOG
MULTIPLEXER
TEMPERATURE
VALUE REGISTERS
A/D
CONVERTER
VOLTAGE
VALUE REGISTERS
GND
Figure 1.
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  
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage (VCC)
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
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
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.
ADT7488A
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
44
Unit
°C/W
ESD CAUTION
Rev. 0 | Page 5 of 16
5 Page 
Command Code Details
ADT7488A Device Identifier Block
The GetDIB() command retrieves the device identifier block
(DIB), which provides information to identify the capabilities of
the ADT7488A. 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
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 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 ADT7488A 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 ADT7488A.
ADT7488A
Table 9. ResetDevice() Command
Write
Read
Target Address Length Length
Device Address 0x01
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 ±128°C with +0.25°C 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.
Rev. 0 | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADT7488A.PDF ] | |
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