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