Product Description
23
1.10
Real-Time Clock
A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the kit is not
plugged into a wall socket, the battery has an estimated life of three years. When the kit 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 5 V STBY rail.
NOTE
If the battery and AC power fail, date and time values will be reset and the user will be notified
during the 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 12 on page 40 shows the location of the battery.
1.11
Audio
The integrated Realtek ALC700 audio subsystem supports the following features:
•
Digital microphone array (DMICS) connectors (internal)
•
Analog line-out/Analog Headphone/Analog Microphone (front panel jack)
•
Analog stereo line-out/TOSLINK out (back panel jack)
―
Analog Speakers only (Stereo)
―
SPDIF optical output formats up to compressed 5.1/7.1
•
Support for 44.1 kHz/48 kHz/96 kHz/192 kHz sample rates on all analog outputs
•
Support for 44.1 kHz/48 kHz/96 kHz sample rates on all analog inputs
•
Front Panel Audio Jack Support (see Figure 3 for 3.5 mm audio jack pin out):
―
Speakers only (Stereo)
―
Headphones only (Stereo)
―
Microphone only (mono)
―
Combo Headphone (Stereo)/Microphone (mono)
Pin Number
Pin Name
Description
1
Tip
Left Audio Out
2
Ring
Right Audio Out
3
Ring
Common/Ground
4
Sleeve
Audio In/MIC
Figure 3. 4-Pin 3.5 mm (1/8 inch) Audio Jack Pin Out
NOTE
The analog circuit of the front panel audio connector is designed to power headphones or
amplified speakers only. Poor audio quality occurs if passive (non-amplified) speakers are
connected to this output.
