MC1066 Datasheet, PDF (1/16 Pages) ON Semiconductor – ACPI-Compliant SMBus Temperature Sensor with Internal and External Diode Input

MC1066
ACPI-Compliant SMBus
Temperature Sensor with
Internal and External Diode Input
The MC1066 is a serially programmable temperature sensor
optimized for monitoring modern high performance CPUs with
on–board integrated temperature sensing diodes. Temperature data is
http://onsemi.com
converted from the CPU’s diode outputs and made available as an
8–bit digital word.
Communication with the MC1066 is accomplished via the standard
System Management Bus (SMBus) commonly used in modern
computer systems. This permits reading the current internal/external
temperature, programming the threshold setpoints, and configuring
the device. Additionally, an interrupt is generated on the
16–Pin QSOP
DB SUFFIX
ALERT/COMP pin when temperature moves outside the preset
threshold windows in either direction. A separate CRITICAL setpoint
CASE TBD
PRELIMINARY INFORMATION
is provided through external hardwiring for “fail safe” operation per
ACPI guidelines.
A Standby command may be sent via the SMBus or by signaling the
STBY input pin to activate the low–power Standby mode. Registers
PIN CONFIGURATION
(Top View)
can be accessed while in Standby mode. Address selection inputs
allow up to nine MC1066s to share the same 2–wire SMBus for
multi–zone monitoring.
All registers can be read by the host, and both polled and interrupt
driven systems are easily accommodated. Small size, low installed
cost, and ease of use make the MC1066 an ideal choice for
CRIT1 ₁
16 NC
VDD 2
15 STBY
D+ 3
14 SCL
D– ₄
13 INT_SEL
CRIT0 ₅ ^MC1066 ₁₂ SDA
implementing sophisticated system management schemes, such as
ADD1 6
11 ALERT/COMP
ACPI.
GND 7
10 ADD0
Features
• Specifically ACPI–Compliant
GND ₈
9 OS
• Backward Compliant to Older APM Systems
• Includes Internal and External Sensing Capability
• Outputs Temperature As 8–Bit Digital Word
• Solid State Temperature Sensing; 1°C Resolution
• 3.0 — 5.5V Operating Range
• Independent Internal and External Threshold Set–Points With
ALERT/COMP Interrupt Output
ORDERING INFORMATION
Device
Package
Shipping
• SMBus 2–Wire Serial Interface
MC1066DBR2 16–Pin QSOP 2500 Tape/Reel
• Optional CRITICAL Set–Point for Full ACPI Compliant
Implementation
• Up To Nine MC1066s May Share the Same Bus
• Low Standby Power Mode
• Low Power: 70 µA (max) Operating, 10 µA (max) Standby Mode
• 16–Pin Plastic QSOP Package
Typical Applications
• Thermal Protection For Intel “Deschutes” Pentium™ II and Other High Performance
CPUs with Integrated On–Board Diode - No Sensor Mounting Problems!
• Accurate Temperature Sensing From Any Silicon Junction Diode
• Thermal Management in Electronic Systems: Computers, Network Equipment, Power Supplies
© Semiconductor Components Industries, LLC, 1999
1
February, 2000 – Rev. 0
Publication Order Number:
MC1066/D