SI4844-B-DEMO Datasheet, PDF (10/18 Pages) Silicon Laboratories – Si4844-B DEMO BOARD USERS GUIDE

Si4844-B-DEMO
4.2. FM/AM/SW Radio Mode
In Time mode, after a long press (hold time > 1s) of the POWER/BAND button or when the alarm time is reached,
the device will enter FM/AM/SW Mode. The LCD displays the following information: band indicator, band frequency
indicator, and sleep indicator in case the radio is automatically turned on by the alarm.
The demo board display in FM/AM/SW Mode is illustrated in Figure 3.
Figure 3. LCD Display in FM Radio Mode
The demo board provides two methods for selecting the radio band. One is to use the slide switch S2. The other is
to use the POWER/BAND push button. S14 determines which method is in use.
The demo board also provides two methods for setting the band property. One is to use the tuner default values.
The other method is to use the keypad to reconfigure the band property value via the MCU. S13 determines which
method is in use. If you use the tuner default values, the band property is fixed and cannot be reconfigured. Refer
to Section "4.2.1. MCU Setting Band Property” for the operation details for setting the band property using the
keypad.
To operate the demo board, follow these procedures:
1. According to the desired radio band selection method, set S14 to use slide switch or push button.
2. According to the desired radio band property, set S13 to use tuner default values or reconfigure the band
property via MCU.
3. Hold the POWER/BAND button (hold time > 1s) or when the alarm time is reached, the device will enter
FM/AM/SW Mode.
4. Use slide switch S2 or press the POWER/BAND push button to select the desired band.
5. Refer to Section "4.2.1. MCU Setting Band Property” or section "4.2.2. MCU Setting Radio Working Mode”
to reconfigure the band property or radio working mode if necessary.
6. Rotate the tuning wheel and find the desired radio station with the help of the LCD display and/or tuning
indicator D1.
7. Rotate the volume control wheel VR2 and/or press the DOWN/VOL– or UP/VOL+ button to get a
comfortable volume. Press the BASS/TMR or TREBLE/AL button to get the desired bass/treble level.
Note: For FM listening, the earphone cable must be connected to the board when S12 is set to HP ANT or an external antenna
must be connected to the BNC connector when S12 is set to BNC.
For AM listening, the ferrite antenna must be connected to the board and the S11 is set to Ferrite before turning on the
radio or switching the band to AM.
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