SI4827-DEMO Datasheet, PDF (10/16 Pages) Silicon Laboratories – Si4827 DEMO BOARD USERS GUIDE

Si4827-DEMO
4.2.1. MCU Setting Band Property
The DEMO board enables the band property to be set by the MCU. The band property includes:
Band top
Band bottom
De-emphasis (only for FM)
Channel Space (only for AM)
The setting menu is illustrated in Figure 4.
To set the band properties, follow these steps:
1. Press the SETTING button to enter the setting menu and select the item to be set. The selected item
flashes for 1 second, then automatically switches to its current value.
2. While the value is flashing, press the DOWN/VOL- or UP/VOL+ button to set the desired value within 3
seconds.
3. Repeat step 1 and 2 to finish setting the band properties.
4. When the Band properties are set, the MCU automatically quits setting the menu if there is no operation
within 3 seconds.
5. In FM working mode, press the DE/SPC button to set the De-emphasis 50 µs or 75 µs.
6. In AM working mode, press the DE/SPC button to set the Channel Space 9 kHz or 10 kHz.
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Figure 4. Setting Menu
4.2.2. MCU Setting Radio Working Mode
The host MCU can set the radio working mode
The working modes include:
Tone/volume mode, item 3 in setting menu
Tuning preference (only for FM and SW), item 4 in setting menu
To set radio working mode, follow these procedures:
1. Press the SETTING button to enter item 3. The LCD displays the item number st3 for 1 second, then
automatically switches to its mode indication.
2. Press the DOWN/VOL- or UP/VOL+ button to select the desired mode within 3 seconds.
3. Repeat steps 1 and 2 to set the tuning preference by setting the item 4.
4. When the radio working mode is set, the MCU automatically quits setting the menu if there is no operation
within 3 seconds.
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