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Numéro de référence ADT7481
Description Dual Channel Temperature Sensor and Overtemperature Alarm
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ADT7481 Datasheet, Description
ADT7481
Dual Channel Temperature
Sensor and Overtemperature
Alarm
The ADT7481 is a 3-channel digital thermometer and under/ over
temperature alarm, intended for use in PCs and thermal management
systems. It can measure its own ambient temperature or the
temperature of two remote thermal diodes. These thermal diodes can
be located in a CPU or GPU, or they can be discrete diode connected
transistors. The ambient temperature, or the temperature of the remote
thermal diode, can be accurately measured to ±1°C. The temperature
measurement range defaults to 0°C to +127°C, compatible with
ADM1032, but can be switched to a wider measurement range from
−64°C to +191°C.
The ADT7481 communicates over a 2-wire serial interface
compatible with System Management Bus (SMBus) standards. The
SMBus address of the ADT7481 is 0x4C. An ADT7481−1 with an
SMBus address of 0x4B is also available.
An ALERT output signals when the on-chip or remote temperature
is outside the programmed limits. The THERM output is a comparator
output that allows, for example, on/off control of a cooling fan. The
ALERT output can be reconfigured as a second THERM output if
required.
Features
1 Local and 2 Remote Temperature Sensors
0.25°C Resolution/1°C Accuracy on Remote Channels
1°C Resolution/1°C Accuracy on Local Channel
Extended, Switchable Temperature Measurement Range
0°C to 127°C (Default) or −64°C to +191°C
2-wire SMBus Serial Interface with SMBus ALERT Support
Programmable Over/Undertemperature Limits
Offset Registers for System Calibration
Up to 2 Overtemperature Fail-Safe THERM Outputs
Small 10-lead MSOP Package
240 mA Operating Current, 5 mA Standby Current
These Devices are Pb-Free, Halogen Free and are RoHS Compliant
Applications
Desktop and Notebook Computers
Industrial Controllers
Smart Batteries
Automotive
Embedded Systems
Burn-In Applications
Instrumentation
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MSOP−10
CASE 846AC
PIN ASSIGNMENT
VDD 1
D1+ 2
D1− 3
THERM 4
GND 5
10 SCLK
9 SDATA
ADT7481 8 ALERT/THERM2
7 D2+
6 D2−
MARKING DIAGRAM
10
T0x
AYWG
G
1
T0x = Refer to Ordering Info Table
A = Assembly Location
Y = Year
W = Work Week
G = Pb-Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 19 of this data sheet.
© Semiconductor Components Industries, LLC, 2014
September, 2014 − Rev. 8
1
Publication Order Number:
ADT7481/D
ADT7481 Fiche technique
ADT7481
Table 3. PIN ASSIGNMENT
Pin No.
1
2
3
4
Mnemonic
VDD
D1+
D1−
THERM
5 GND
6 D2−
7 D2+
8 ALERT/THERM2
9 SDATA
10 SCLK
Description
Positive Supply, 3.0 V to 3.6 V.
Positive Connection to the Remote 1 Temperature Sensor.
Negative Connection to the Remote 1 Temperature Sensor.
Open-Drain Output. Requires pullup resistor. Signals overtemperature events, could be used to turn a
fan on/off, or throttle a CPU clock.
Supply Ground Connection.
Negative Connection to the Remote 2 Temperature Sensor.
Positive Connection to the Remote 2 Temperature Sensor.
Open-Drain Logic Output. Used as interrupt or SMBALERT. This may also be configured as a second
THERM output. Requires pullup resistor.
Logic Input/Output, SMBus Serial Data. Open-Drain Output. Requires pullup resistor.
Logic Input, SMBus Serial Clock. Requires pullup resistor.
Table 4. TIMING SPECIFICATIONS (Note 1)
Parameter
Limit at TMIN and TMAX
fSCLK
400
tLOW
1.3
tHIGH
0.6
tR 300
tF 300
tSU; STA
600
tHD; STA (Note 2)
600
tSU; DAT (Note 3)
100
tHD; DAT
300
tSU; STO (Note 4)
600
tBUF
1.3
1. Guaranteed by design, not production tested.
2. Time from 10% of SDATA to 90% of SCLK.
3. Time for 10% or 90% of SDATA to 10% of SCLK.
4. Time for 90% of SCLK to 10% of SDATA.
Unit
kHz max
ms min
ms min
ns max
ns max
ns min
ns min
ns min
ns min
ns min
ms min
Description
Clock low period, between 10% points.
Clock high period, between 90% points.
Clock/data rise time.
Clock/data fall time.
Start condition setup time.
Start condition hold time.
Data setup time.
Data hold time.
Stop condition setup time.
Bus free time between stop and start conditions.
SCLK
SDATA
tBUF
STOP START
t LOW
tR
tHD; STA
tHD; DAT
tF
tHIGH
tSU; DAT
t HD; STA
tSU; STA
START
Figure 2. Serial Bus Timing
tSU; STO
STOP
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ADT7481 pdf
ADT7481
TYPICAL PERFORMANCE CHARACTERISTICS (Cont’d)
422
420
DEV 2BC
418
416
414
DEV 3BC
DEV 4BC
412
410
408
3.0 3.1 3.2 3.3 3.4 3.5 3.6
VDD (V)
Figure 9. Operating Supply Current vs. Voltage
4.4
DEV 2
4.2
4.0
DEV 3
3.8
DEV 4
3.6
3.4
3.2
3.0
3.0 3.1 3.2 3.3 3.4 3.5 3.6
VDD (V)
Figure 10. Standby Supply Current vs. Voltage
35
DEV 2BC
DEV 3BC
30 DEV 4BC
25
20
15
10
5
0
1 10 100 1000
FSCL (kHz)
Figure 11. Standby Supply Current vs. SCLK
Frequency
25
20
100 mV
15
10 50 mV
5 20 mV
0
0 100 200 300 400 500 600
NOISE FREQUENCY (MHz)
Figure 12. Temperature Error vs. Common-Mode
Noise Frequency
80
70
60 100 mV
50
40
30
50 mV
20
10 20 mV
0
−10
0
100 200 300 400 500
NOISE FREQUENCY (MHz)
600
Figure 13. Temperature Error vs. Differential Mode Noise Frequency
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