Intel Desktop Board DP55WB Technical Product Specification

1.7 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 3.3 VSB 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.

1.8 Audio Subsystem

The board supports the Intel High Definition Audio subsystem based on the Realtek

ALC888-VC2-GR audio codec. The audio subsystem supports the following features:

• Advanced jack sense for the back panel audio jacks that enables the audio codec to

recognize the device that is connected to an audio port. The back panel audio

jacks are capable of retasking according to the user’s definition, or can be

automatically switched depending on the recognized device type.

• 3-port analog audio out stack

• Internal S/PDIF out

• Windows Vista Premium and Windows 7 certification

Table 4 lists the supported functions of the front panel and back panel audio jacks.

Table 4. Audio Jack Support

Audio Jack

Micro-

phone

Head-

phones

Front

Speaker

(Main

Stereo)

Line In

Rear

Surround

(Stereo 2)

Center/Sub

(Stereo 3)

Front panel – Green Default Ctrl panel

Front panel – Pink Default

Back panel – Blue Default Ctrl panel

Back panel – Green Ctrl panel Default

Back panel – Pink Default Ctrl panel