Overview: 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 http://onsemi.com on–board integrated temperature sensing diodes. Temperature data is 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 16–Pin QSOP the device. Additionally, an interrupt is generated on the DB SUFFIX CASE TBD ALERT/COMP pin when temperature moves outside the preset PRELIMINARY INFORMATION threshold windows in either direction. A separate CRITICAL setpoint is provided through external hardwiring for “fail safe” operation per ACPI guidelines. PIN CONFIGURATION A Standby command may be sent via the SMBus or by signaling the (Top View) STBY input pin to activate the low–power Standby mode. Registers can be accessed while in Standby mode. Address selection inputs CRIT1 1 16 NC allow up to nine MC1066s to share the same 2–wire SMBus for VDD 2 15 STBY multi–zone monitoring. + 3 D 14 SCL All registers can be read by the host, and both polled and interrupt – 4 D 13 INT_SEL driven systems are easily accommodated. Small size, low installed MC1066 CRIT0 12 SDA 5 cost, and ease of use make the MC1066 an ideal choice for ADD1 6 11 ALERT/COMP implementing sophisticated system management schemes, such as GND 7 ACPI.
