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PDF ADT7461 Fiche technique - ON Semiconductor

Numéro de référence ADT7461
Description Temperature Monitor
Fabricant ON Semiconductor 
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ADT7461 Datasheet, Description
ADT7461
+15C Temperature Monitor
with Series Resistance
Cancellation
The ADT7461 is a dual-channel digital thermometer and under/over
temperature alarm intended for use in PCs and thermal management
systems. It is pin- and register-compatible with the ADM1032. The
ADT7461 has three additional features: series resistance cancellation
(where up to 3 kW (typical) of resistance in series with the temperature
monitoring diode may be automatically cancelled from the temperature
result, allowing noise filtering); configurable ALERT output; and an
extended, switchable temperature measurement range. The ADT7461
can accurately measure the temperature of a remote thermal diode to
±1°C and the ambient temperature to ±3°C. The temperature
measurement range defaults to 0°C to +127°C, compatible with the
ADM1032, but can be switched to a wider measurement range of 55°C
to +150°C. The ADT7461 communicates over a 2-wire serial interface
compatible with system management bus (SMBus) standards. An
ALERT output signals when the on-chip or remote temperature is out of
range. The THERM output is a comparator output that allows on/off
control of a cooling fan. The ALERT output can be reconfigured as a
second THERM output, if required.
The SMBus address of the ADT7461 is 0x4C. An ADT7461-2 is also
available, which uses SMBus Address 0x4D.
Features
On-Chip and Remote Temperature Sensor
0.25°C Resolution/1°C Accuracy on Remote Channel
1°C Resolution/3°C Accuracy on Local Channel
Automatically Cancels Up to 3 kW (Typ) of Resistance in Series with
Remote Diode to Allow Noise Filtering
Extended, Switchable Temperature Measurement Range
0°C to +127°C (Default) or –55°C to +150°C
Pin- and Register-Compatible with the ADM1032
2-wire SMBus Serial Interface with SMBus Alert Support
Two SMBus Address Versions Available:
ADT7461 SMBus Address is 0x4C
ADT7461-2 SMBus Address is 0x4D
Programmable Over/Undertemperature Limits
Offset Registers for System Calibration
Up to Two Overtemperature FailSafe THERM Outputs
Small 8-lead SOIC NB or 8-lead MSOP Packages
170 mA Operating Current, 5.5 mA Standby Current
These are Pb-Free Devices*
Applications
Desktop and Notebook Computers
Industrial Controllers
Smart Batteries
Embedded Systems
Instrumentation
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SOIC8 NB
CASE 751
MSOP8
CASE 846AB
PIN ASSIGNMENT
VDD 1
D+ 2
D3
THERM 4
8 SCLK
7 SDATA
6 ALERT/THERM2
5 GND
(Top View)
MARKING DIAGRAMS
8
ADT74
61A
#YWW
1
SOIC8
ADT7461A
#
Y
W
= Specific Device Code
= Pb-Free Package
= Year
= Work Week
8
T1x
AYWG
G
1
MSOP8
T1x = Refer to Order 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 18 of this data sheet.
* For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2014
March, 2014 Rev. 8
1
Publication Order Number:
ADT7461/D
ADT7461 Fiche technique
ADT7461
Table 3. PIN ASSIGNMENT
Pin No.
Mnemonic
1 VDD
2 D+
3 D
4 THERM
5 GND
6 ALERT/THERM2
7 SDATA
8 SCLK
Description
Positive Supply, 3.0 V to 5.5 V.
Positive Connection to Remote Temperature Sensor.
Negative Connection to Remote Temperature Sensor.
Open-Drain output that can be used to turn a fan on/off or throttle a CPU clock in the event of an
overtemperature condition. Requires pullup to VDD.
Supply Ground Connection.
Open-Drain Logic Output Used as Interrupt or SMBus Alert. 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. SMBus 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, but 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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ADT7461 pdf
ADT7461
TYPICAL PERFORMANCE CHARACTERISTICS (Cont’d)
4
40mV NO FILTER
60mV NO FILTER
3 40mV WITH FILTER
60mV WITH FILTER
2
1
0
1
2
0
100 200 300 400 500 600
FREQUENCY (MHz)
Figure 9. Temperature Error vs. Common-Mode
Noise Frequency (With and Without R-C-R Filter
of 100 W Ć 2.2 nF - 100 W)
7
6
5
4
3
2
1
0
3.0 3.4 3.8 4.2 4.6 5.0 5.4
VDD (V)
Figure 11. Standby Current vs. Supply Voltage
800
700
600 5.5 V
500
400
300
200
100 3 V
0
0.01
0.1
1
10 100
CONVERSION RATE (Hz)
Figure 13. Operating Supply Current vs.
Conversion Rate
40
35
30
5.5 V
25
20
15
10 3 V
5
0
0 50 100 150 200 250 300 350 400
SCL CLOCK FREQUENCY (kHz)
Figure 10. Standby Supply Current vs. Clock
Frequency
55
45
100 mV
NO FILTER
35
25
15
5
5
0
100 mV WITH FILTER
100 200 300 400 500 600
FREQUENCY (MHz)
Figure 12. Temperature Error vs. 100 mV
Common-Mode Noise Frequency (With and
Without R-C-R Filter of 100 W - 2.2 nF - 100 W)
50
45
40
35
30
25
20
15
10
5
0
5 0
3.3 V T = 30
3.3 V T = +25
3.3 V T = +120
5.5 V T = 30
5.5 V T = +25
5.5 V T = +120
2 10 200 1k 2k 3k 4k
SERIES RESISTANCE (W)
Figure 14. Temperature Error vs. Series
Resistance
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