Intel DH55TC DH55TC Technical Product Specification - Page 25
Real-Time Clock Subsystem, Hardware Management Subsystem - cpu compatibility
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Product Description 1.13 Real-Time Clock Subsystem A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the computer is not plugged into a wall socket, the battery has an estimated life of three years. When the computer is plugged in, the standby current from the power supply extends the life of the battery. The clock is accurate to ± 13 minutes/year at 25 ºC with power applied via the power supply 5V STBY rail. NOTE If the battery and AC power fail date and time values will be reset and the user will be notified during POST. When the voltage drops below a certain level, the BIOS Setup program settings stored in CMOS RAM (for example, the date and time) might not be accurate. Replace the battery with an equivalent one. Figure 1 on page 11 shows the location of the battery. 1.14 Hardware Management Subsystem The hardware management features enable the board to be compatible with the Wired for Management (WfM) specification. The board has several hardware management features, including the following: • Fan monitoring and control • Thermal and voltage monitoring 1.14.1 Hardware Monitoring and Fan Control The features of the hardware monitoring and fan control include: • Intel Quiet System Technology, delivering acoustically-optimized thermal management • Thermal sensors in the processor and PCH, as well as near the CPU voltage regulators and system memory • Monitoring of five system voltages (+5 V, +12 V, +3.3 V, Memory V-SM and +VCCP) to detect levels above or below acceptable values • Thermally monitored closed-loop fan control for all three fans that can adjust fan speed as needed 1.14.2 Fan Monitoring Fan monitoring can be observed via the BIOS setup user interface, Intel® Desktop Utilities or third-party software. For information about The functions of the fan headers Refer to Section 1.15.2.2, page 31 25