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PDF ADT7484A Data sheet ( Hoja de datos )
| Número de pieza | ADT7484A | |
| Descripción | Digital Temperature Sensor | |
| Fabricantes | ON Semiconductor | |
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ADT7484A/ADT7486A
Digital Temperature Sensor
with SST Interface
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.
Features
• 1 On-Chip Temperature Sensor
• 1 or 2 Remote Temperature Sensors
• Simple Serial Transportt (SSTt) Interface Rev 1 Compliant
• These are Pb−Free Devices
Applications
• Personal Computers
• Portable Personal Devices
• Industrial Sensor Nets
© Semiconductor Components Industries, LLC, 2009
December, 2009 − Rev. 4
1
http://onsemi.com
SOIC−8
1 CASE 751
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
MSOP−8
1 CASE 846AB
MARKING
DIAGRAMS
8
T7484A
ALYWG
G
1
8
T20
AYWG
G
1
10
MSOP−10
1 CASE 846AC
T2x = Specific Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
T22
AYWG
G
1
(Note: Microdot may be in either location)
PIN ASSIGNMENTS
VCC 1
8 SST
GND 2 ADT7484A 7 ADD0
D1+ 3
6 RESERVED
D1– 4
5 ADD1
(Top View)
VCC 1
10 SST
GND 2
9 ADD0
D1+ 3 ADT7486A 8 RESERVED
D1– 4
7 ADD1
D2+ 5
6 D2–
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
Publication Order Number:
ADT7484A−86A/D
1 page  
ADT7484A/ADT7486A
TYPICAL CHARACTERISTICS
1.55
1.50
1.45
750Ω (~2mA)
1.40
1.35
270Ω (~5.2mA)
1.30
1.25
120Ω (~10.6mA)
1.20
2.6 2.8 3.0 3.2 3.4 3.6
VCC (V)
Figure 2. SST O/P Level vs. Supply Voltage
3.56
3.55
3.54
3.53
3.52
3.51
3.50
3.49
3.48
3.47
3.46
3.45
–45
–25
–5
DEV3
DEV2
DEV1
15 35 55 75
TEMPERATURE (5C)
95 115
Figure 3. Supply Current vs. Temperature
7
6
5
4
3 HI SPEC (VCC = 3V)
2 MEAN (VCC = 3.3V)
1
0
–1 LO SPEC (VCC = 3.6V)
–60 –40 –20 0 20 40 60 80
TEMPERATURE (5C)
100 120 140
Figure 4. Local Temperature Error
1.55
1.50
750Ω (~2mA)
1.45
1.40
1.35
1.30
1.25
1.20
–50
270Ω (~5.2mA)
120Ω (~10.6mA)
0 50 100
TEMPERATURE (5C)
150
Figure 5. SST O/P Level vs. Temperature
3.9
3.7
DEV2
DEV3
3.5
DEV1
3.3
3.1
2.9
2.65
2.85
3.05
3.25
VCC (V)
3.45
Figure 6. Supply Current vs. Voltage
3.65
7
6
5
4
3
2 HI SPEC (VCC = 3V)
1
MEAN (VCC = 3.3V)
–2
–60 –40 –20
LO SPEC (VCC = 3.6V)
0 20 40 60 80 100 120 140
TEMPERATURE (5C)
Figure 7. Remote Temperature Error
http://onsemi.com
5
5 Page 
ADT7484A/ADT7486A
Temperature Offset
As CPUs run faster, it is more difficult to avoid high
frequency clocks when running the D1+ and D1− tracks
around a system board. Even when the recommended layout
guidelines are followed, there may still be temperature
errors, attributed to noise being coupled on to the D1+ and
D1− lines. High frequency noise generally has the effect of
producing temperature measurements that are consistently
too high by a specific amount. The ADT7484A/
ADT87486A have a temperature offset command code of
0xe0 through which a desired offset can be set. By doing a
one−time calibration of the system, the offset caused by
system board noise can be calculated and nulled by
specifying it in the ADT7484A/ADT7486A. The offset is
automatically added to every temperature measurement.
The maximum offset is ±128°C with 0.25°C resolution. The
offset format is the same as the temperature data format;
16−bit, twos complement notation, as shown in Table 8. The
offset should be programmed in little endian format, that is,
LSB before MSB. The offset value is also returned in little
endian format when read.
Application Schematics
2N3904 OR CPU
THERMAL DIODE
VCC ADT7484A
1 VCC
2 GND
SST 8
ADD0 7
3 D1+ RESERVED 6
4 D1–
ADD1 5
SST
Figure 17. ADT7484A Typical Application Schematic
2N3904
NPN
VCC ADT7486A
1 VCC
2 GND
SST
ADD0
10
9
3 D1+ RESERVED 8
4 D1–
ADD1 7
5 D2+
D2– 6
SST
CPU
THERMAL
DIODE
Figure 18. ADT7486A Typical Application Schematic
ORDERING INFORMATION
Device Order Number*
Branding
Package Option
Package Type
Shipping†
ADT7484AARZ-REEL
−
R−8
SOIC−8 NB
2500 Tape & Reel
ADT7484AARZ-RL7
−
R−8
SOIC−8 NB
1000 Tape & Reel
ADT7484AARMZ-RL
T20
RM−8
8-Lead MSOP
3000 Tape & Reel
ADT7484AARMZ-R7
T20
RM−8
8-Lead MSOP
1000 Tape & Reel
ADT7486AARMZ-RL
T22
RM−10
10-Lead MSOP
3000 Tape & Reel
ADT7486AARMZ-R7
T22
RM−10
10-Lead MSOP
1000 Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*These are Pb−Free packages.
http://onsemi.com
11
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