SI4731-DEMO Datasheet, PDF (4/14 Pages) Silicon Laboratories – Si4731 DEMO BOARD USERS GUIDE

Si4731-DEMO
4. Operation
This section describes the operating modes of the Si4731-DEMO board. The board provides two major modes of
operation: Calendar and AM/FM radio.
4.1. Calendar Mode
Upon power on, the board automatically enters the Calendar Mode and displays the following information:
 Year-month-day
 Hour-minute
 Day of the week
 Battery voltage
The demo board display in Calendar Mode is illustrated in Figure 1.
In Calendar Mode, the SET/9 key is used to enter the setup menu. The M+/3 and M-/7 keys are used to select
different adjustable items (hour, minutes, year, day, month). The UP/4 and DOWN/8 keys are used to set the value
for each selected item.
The Calendar Mode date and time can also be set automatically with RDS Current Time (CT) information from a
broadcast radio station as described in the following section.
4.2. AM/FM Radio Mode
From Calendar Mode, the POWER button is used to enter AM/FM Radio Mode which displays the following
information:
1. Signal SNR indicator
2. Signal RSSI indicator
3. Band frequency indicator
4. Battery voltage indicator
5. Band frequency unit indicator
6. Stereo/mono indicator
7. Volume indicator
8. Band indicator
9. RDS information
The demo board display in AM/FM Radio Mode is illustrated in Figure 3 and Figure 4:
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1
3
2
4
7
5
8
9
Figure 3. LCD Display in FM Radio Mode
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Rev. 0.1