SI4840-DEMO Datasheet, PDF (12/22 Pages) Silicon Laboratories – Si4840/44 DEMO BOARD USERS GUIDE

Si4840/44-DEMO
4.2.1. MCU Setting Band Property
The demo board provides the function that the band property can be set by MCU. The band property includes:
 Band top
 Band bottom
 Blend mono (only for FM)
 Blend stereo (only for FM)
 Blend separation (only for FM)
 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 steps 1 and 2 to finish setting the band properties.
4. When the band properties are set, the MCU automatically quits the setting menu if there is no operation within 3
seconds.
5. In FM working mode, press the DE/SPC button to set the De-emphasis to 50 or 75 µs.
6. IN AM working mode, press the DE/SPC button to set the Channel Space to 9 kHz or 10 kHz.
SETTING MENU:
1 BAND TOP
2 BAND BOTTOM
3 BLEND MONO
4 BLEND STEREO
5 BLEND SEPARATION
6 TONE/VOL MODE
7 Tuning preference
a Bass/Treble MODE
b Dig-Vol MODE
c MIX MODE1
d MIX MODE2
a preference1
b preference2
c preference3
d preference4
Figure 4. Setting Menu
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