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ADT7482ARMZ-RL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
Semiconductor Components Industries, LLC, 2012
July, 2012 − Rev. 4
1 Publication Order Number:
ADT7482/D
ADT7482
Dual Channel Temperature
Sensor and Overtemperature
Alarm
The ADT7482 is a three-channel digital thermometer and
under/overtemperature alarm for PCs and thermal management
systems. It can measure the temperature in two remote locations, such
as in the remote thermal diode in a CPU or GPU, or using a discrete
diode connected transistor. This device also measures its own ambient
temperature.
One feature of the ADT7482 is series resistance cancellation where
up to 1.5 kW (typical) of resistance in series with each of the
temperature monitoring diodes can be automatically cancelled from
the temperature result, allowing noise filtering. The temperature of the
remote thermal diodes and ambient temperature can be measured
accurate to 1C. The temperature measurement range, which defaults
to 0C to 127C, can be switched to a wider measurement range of
from −55C to +150C.
The ADT7482 communicates over a 2-wire serial interface
compatible with System Management Bus (SMBus) standards. The
default address of the ADT7482 is 0x4C. 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 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
0.25C Resolution/1C Accuracy on Remote Channels
1C Resolution/1C Accuracy on Local Channel
Automatically Cancels Up to 1.5 kW (Typ) of Resistance in Series
with the Remote Sensors
Extended, Switchable Temperature Measurement Range
0C to +127C (Default) or −55C to +150C
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
240ĂmA Operating Current, 5ĂmA Standby Current
This Device is Pb-Free, Halogen Free and is RoHS Compliant
Applications
Desktop and Notebook Computers
Industrial Controllers
Smart Batteries
Automotive
Embedded Systems
Burn-in Applications
Instrumentation
MARKING DIAGRAM
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 19 of this data sheet.
ORDERING INFORMATION
MSOP−10
CASE 846AC
T0A
AYWG
G
1
10
PIN ASSIGNMENT
T0A = Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb-Free Package
(Note: Microdot may be in either location)
ALERT/THERM2
SCLK
SDATA
D2+
D2−
V
DD
D1+
D1−
THERM
GND
10
9
8
7
6
5
4
3
2
1
ADT7482
ADT7482
http://onsemi.com
2
Figure 1. Functional Block Diagram
ON-CHIP
TEMPERATURE
SENSOR
ANALOG
MUX
BUSY
11-BIT ADC
LOCAL TEMPERATURE
VALUE REGISTER
REMOTE 1 AND 2 TEMP
OFFSET REGISTER
RUN/STANDBY
EXTERNAL DIODE OPEN-CIRCUIT
STATUS REGISTERS
SMBus INTERFACE
LIMIT COMPARATOR
DIGITAL MUX
INTERRUPT
MASKING
SDATA SCLK
109
ONE-SHOT
REGISTER
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
THERM
LIMIT REGISTER
LOCAL TEMPERATURE
LOW LIMIT REGISTER
LOCAL TEMPERATURE
HIGH LIMIT REGISTER
REMOTE 1 & 2 TEMP.
THERM
LIMIT REG.
REMOTE 1 & 2 TEMP.
LOW LIMIT REGISTERS
REMOTE 1 & 2 TEMP.
HIGH LIMIT REGISTERS
CONFIGURATION
REGISTER
4
8
GND
5
V
DD
1
ADT7482
D1+
ALERT
/THERM2THERM
2
D1−
3
D2+
7
D2−
6
REMOTE 1 AND 2 TEMP
VALUE REGISTER
ADDRESS POINTER
REGISTER
SRC
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter Rating Unit
Positive Supply Voltage (V
DD
) to GND −0.3 to +3.6 V
D+ −0.3 to V
DD
+ 0.3 V
D− to GND −0.3 to +0.6 V
SCLK, SDATA, ALERT, THERM
−0.3 to +3.6
V
Input Current, SDATA, THERM −1 to +50 mA
Input Current, D− 1 mA
ESD Rating, All Pins (Human Body Model) 2,000 V
Maximum Junction Temperature (T
J
MAX
) 150 C
Storage Temperature Range −65 to +150 C
IR Reflow Peak Temperature 220 C
IR Reflow Peak Temperature for Pb-Free 260 C
Lead Temperature, Soldering (10 sec) 300 C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
NOTE: This device is ESD sensitive. Use standard ESD precautions when handling.
Table 2. THERMAL CHARACTERISTICS (Note 1)
Package Type
q
JA
q
JC
Unit
10-lead MSOP 142 43.7 C/W
1. q
JA
is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages.
ADT7482
http://onsemi.com
3
Table 3. PIN ASSIGNMENT
Pin No. Mnemonic Description
1 V
DD
Positive Supply, 3.0 V to 3.6 V.
2 D1+ Positive Connection to the First Remote (Remote 1) Temperature Sensor.
3 D1− Negative Connection to the First Remote (Remote 1) Temperature Sensor.
4 THERM Open-Drain Output. This pin can be used to turn a fan on/off or throttle a CPU clock in the event of an
overtemperature condition. Requires pullup resistor.
5 GND Supply Ground Connection.
6 D2− Negative Connection to the Second Remote (Remote 2) Temperature Sensor.
7 D2+ Positive Connection to the Second Remote (Remote 2) Temperature Sensor.
8 ALERT/THERM2 Open-Drain Logic Output. This pin is used as interrupt or SMBus alert. May also be configured as a
second THERM
output. Requires pullup resistor.
9 SDATA Logic Input/Output, SMBus Serial Data. Open-Drain Output. Requires pullup resistor.
10 SCLK Logic Input, SMBus Serial Clock. Requires pullup resistor.
Table 4. TIMING SPECIFICATIONS (Note 1)
Parameter
Limit at T
MIN
and T
MAX
Unit Description
f
SCLK
400 kHz max
t
LOW
1.3
ms min
Clock Low Period, between 10% Points
t
HIGH
0.6
ms min
Clock High Period, between 90% Points
t
R
300
ms max
Clock/Data Rise Time
t
F
300 ns max Clock/Data Fall Time
t
SU;
STA
600
ms min
Start Condition Setup Time
t
HD;
STA
(Note 2)
600
ms min
Start Condition Hold Time
t
SU;
DAT
(Note 3)
100 ns min Data Setup Time
t
SU;
STO
(Note 4)
600
ms min
Stop Condition Setup Time
t
BUF
1.3
ms min
Bus Free Time between Stop and Start Conditions
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.
Figure 2. Serial Bus Timing
STOPSTART
t
SU; DAT
t
HIGH
t
F
t
HD; DAT
t
R
t
LOW
t
SU; STO
STOP START
SCLK
SDATA
t
BUF
t
HD; STA
t
HD; STA
t
SU; STA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

ADT7482ARMZ-RL7

Mfr. #:
Buy ADT7482ARMZ-RL7
Manufacturer:
ON Semiconductor
Description:
SENSOR DIGITAL 0C-127C 10MSOP
Lifecycle:
New from this manufacturer.
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