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Si4840/44-DEMO
Human Interface:
There are 8 keys for controlling the demo board as shown below.
TREBLE/AL
SETTING
BASS/TMR
MONO/ST
DE/SPC
DOWN/VOL-
POWER/BAND
UP/VOL+
Each key can have a different function under each operating condition:
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Time mode: Radio function is disabled. LCD displays time. Buttons can be used to set time, alarm, etc.
FM/AM/SW Radio mode: Tuner IC works in power up mode. Radio function is enabled. LCD displays the radio
station parameters. Buttons are used to adjust radio settings.The functions of the buttons are summarized in
Table 1. The FM/AM/SW radio parameters which can be configured are listed in Table 2.
Table 1. Key Function Description
Button
Hold Time < 1s
POWER/BAND
Hold Time > 1s
DE/SPC
BASS/TMR
TREBLE/AL
Hold Time < 1s
UP/VOL+
Hold Time > 1s
Time Mode
Tuner Off
None
Enable radio
None
Enter or quit setting
menu.
Enable or disable the
alarm function; enter or
quit alarm setting menu.
In setting menu, change
the current time/alarm
parameter by one unit per
each press.
In setting menu, change
the current time/alarm
parameter automatically.
FM/AM/SW Radio Mode
Tuner On
Change between FM, AM, and SW (there are 1 FM
band, 1 AM band and 8 SW bands)
Disable radio function and enter Time mode.
(Radio parameters will be saved to MCU.)
FM mode: Change De-emphasis, between 50 and
75 us.
AM mode: Change channel space, between 9 kHz
and 10 kHz.
Decrease Bass/Treble level by 1 step.
Increase Bass/Treble level by 1 step.
In radio setting menu, change the current parameter
by one unit per each press. In radio working mode,
increase volume 1 step per each press.
In radio setting menu, change the current parameter
automatically.
In radio working mode, increase volume level auto-
matically until to maximum.
6
DOWN/VOL-
Hold Time < 1s
In setting menu, change
the current time/alarm
parameter by one unit per
each press.
Rev 0.1
In radio setting menu, change the current parameter
by one unit per each press. In radio working mode,
decrease volume 1 step per each press.
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