SI4827-DEMO Datasheet, PDF (5/16 Pages) Silicon Laboratories – Si4827 DEMO BOARD USERS GUIDE

Human Interface:
There are 8 keys for controlling the DEMO board as shown below.
Si4827-DEMO
TREBLE/AL
BASS/TMR
DE/SPC
POWER/BAND
SETTING
W/N BAND
DOWN/VOL-
UP/VOL+
Each key can have a different function under each operating condition:
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 below in Table 2.
Table 1. Key Function Description
Button/Mode
Time Mode
FM/AM/SW Radio Mode
POWER/BAND Hold Time:
< 1s
Hold Time:
> 1s
Tuner Off
None
Enable radio
Tuner On
Change between FM, AM, and SW
(2 FM band, 2 AM band, and 8 SW bands)
Disable radio function and enter time mode.
(Radio parameters will be saved to MCU)
DE/SPC
BASS/TMR
None
Enter or quit time setting menu.
FM mode: Change De-emphasis, between
50 µs and 75 µs.
AM mode: Change channel space,
between 9 kHz and 10 kHz.
Decrease Bass/Treble level by 1 step.
TREBLE/AL
Enable or disable the alarm function;
enter or quit alarm setting menu.
Increase Bass/Treble level by 1 step.
UP/VOL+
Hold Time:
< 1s
Hold Time:
> 1s
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.
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 automatically until to maximum.
Rev. 0.1
5