ADT7482 Datasheet, PDF (1/20 Pages) Analog Devices – Dual Channel Temperature Sensor and Overtemperature Alarm

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 ±1°C. The temperature measurement range, which defaults
to 0°C to 127°C, can be switched to a wider measurement range of
from −55°C to +150°C.
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
• 0.25°C Resolution/1°C Accuracy on Remote Channels
• 1°C Resolution/1°C 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
0°C to +127°C (Default) or −55°C to +150°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 are Pb−Free Devices
Applications
• Desktop and Notebook Computers
• Industrial Controllers
• Smart Batteries
• Automotive
• Embedded Systems
• Burn−in Applications
• Instrumentation
© Semiconductor Components Industries, LLC, 2009
1
December, 2009 − Rev. 3
http://onsemi.com
MSOP−10
CASE 846AC
1
MARKING DIAGRAM
10
T0A
AYWG
G
1
T0A = Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN ASSIGNMENT
V_DD 1
D1+ 2
D1– 3
THERM 4
GND 5
ADT7482
10 SCLK
9 SDATA
8 ALERT/THERM2
7 D2+
6 D2–
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 19 of this data sheet.
Publication Order Number:
ADT7482/D