ADT7461A_13 Datasheet, PDF (1/19 Pages) ON Semiconductor – Temperature Monitor with Series Resistance Cancellation

ADT7461A
+15C Temperature Monitor
with Series Resistance
Cancellation
The ADT7461A is a dual-channel digital thermometer and
undertemperature/overtemperature alarm, intended for use in PCs and
thermal management systems. It is pin- and register-compatible with the
ADM1032 and ADT7461. A feature of the ADT7461A is series
resistance cancellation, where up to 1.5 kW (typical) of resistance in
series with the temperature monitoring diode can be automatically
cancelled from the temperature result, allowing noise filtering. The
ADT7461A has a configurable ALERT output and an extended,
switchable temperature measurement range.
The ADT7461A can measure the temperature of a remote thermal
diode accurate to ±1°C and the ambient temperature accurate to ±3°C.
The temperature measurement range defaults to 0°C to +127°C,
compatible with the ADM1032, but it can be switched to a wider
measurement range of −64°C to +191°C.
The ADT7461A communicates over a 2-wire serial interface,
compatible with system management bus (SMBus) standards. The
default SMBus address of the ADT7461A is 0x4C. An ADT7461A−2 is
available with an SMBus address of 0x4D. This is useful if more than one
ADT7461A is used on the same SMBus.
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.
Features
• On-Chip and Remote Temperature Sensor
• 0.25°C Resolution/1°C Accuracy on Remote Channel
• 1°C Resolution/1°C Accuracy on Local Channel
• Automatically Cancels Up to 1.5 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 –64°C to +191°C
• Pin- and Register-Compatible with ADM1032 and ADT7461
• 2-wire SMBus Serial Interface with SMBus Alert Support
• Programmable Over/Undertemperature Limits
• Offset Registers for System Calibration
• Up to Two Overtemperature Fail-Safe THERM Outputs
• Small 8-lead MSOP
• 240 mA Operating Current, 5 mA Standby Current
• These are Pb-Free Devices*
http://onsemi.com
MSOP−8
CASE 846AB
PIN ASSIGNMENT
V_DD 1
D+ 2
D− 3
THERM 4
8 SCLK
7 SDATA
6 ALERT/THERM2
5 GND
(Top View)
MARKING DIAGRAM
8
T1x
AYWG
G
1
T1x = Refer to Ordering Information 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.
Applications
• Desktop and Notebook Computers
• Industrial Controllers
• Smart Batteries
• Automotive
• Embedded Systems
• Burn-In Applications
• Instrumentation
* 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, 2013
1
April, 2013 − Rev. 8
Publication Order Number:
ADT7461A/D