MC1066

    The MC1066 is a serially programmable temperature sensor optimized for monitoring modern high performance CPUs with onboard integrated temperature sensing diodes. Temperature data is converted from the CPU's diode outputs and made available as an 8bit 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 MC1066. Additionally, an interrupt is generated on the ALERT/COMP pin when temperature moves outside the preset threshold windows in either direction. A separate CRITICAL setpoint 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 lowpower Standby mode. Registers MC1066 can be accessed while in Standby mode. Address selection inputs allow up to nine MC1066s to share the same 2wire SMBus for multizone 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 implementing sophisticated system management schemes, such as ACPI.