SI4731-DEMO Datasheet, PDF (8/14 Pages) Silicon Laboratories – Si4731 DEMO BOARD USERS GUIDE

Si4731-DEMO
Table 1. Key Function Description (Continued)
Button/Mode
Calendar Mode
Tuner Off
Radio AM/FM Mode
Tuner On
M+/ M–
In setup menu, select
next calendar item.
In setup menu, select next adjustable item.
In radio mode, tune to the next preset station.
Vol+ /
Vol–
< 3s
>3s
FUNC/DIGIT
Combination
keying
None
None
None
Increase or decrease volume 1 step.
Quickly increase or decrease volume.
Shift the keyboard between normal function and digital input mode.
A: Radio IC version
B: Firmware version
C: Varactor reading
D: AGC status
Note: Combination keying is entered and exited from Radio Mode by pressing and holding the SET key then pressing the
BANDS key. A combination of the SET and the MSCAN keys will cycle through the available display items.
The FM and AM radio parameters which can be configured from setup menu are listed below in Table 2.
Table 2. Radio Configuration Parameters
FM Parameter
Spacing: 50/100/200 kHz
Default: 100 kHz
RSSI Seek: 0–127 dBµV
Default: 20 dBµV
SNR Seek: 0–127 dB
Default: 03 dB
Pre-emphasis: 50 or 75 µs
Default: 75 µs
Band High Threshold: Max 108 MHz
Default:107.90 MHz
Band Low Threshold: min 76 MHz
Default: 87.50 MHz
Channel Filter: 00/40/60/80/100 kHz
Default: 00 (Auto)
RClock: 0: AFC disable
32763~32773
Default: 32768
Smute Rate: 0–255
Default: 64
Smute SNR: 0–15 dB
Default: 4 dB
Smute Attenuation: (0–31 dB)
Default: 16 dB
AM Parameter
Spacing: 1/9/10 kHz
Default: 9 kHz
RSSI Seek: (0–63 dBµV
Default: 25 dBµV
SNR Seek: 0–63 dB
Default: 05 dB
Pre-emphasis: 00 disable, 50 µs
Default: 00
Band High Threshold: Max 1710 kHz
Default:1710 kHz
Band Low Threshold: min 520 kHz
Default: 522 kHz
Channel Filter: 1/2/3/4/6 kHz
Default: 2 kHz
RClock: 0 AFC disable
32763~32773
Default: 32768
Smute Rate: 0–255
Default: 64
Smute SNR: 0–63 dB
Default: 10 dB
Smute Attenuation: 0–63 dB
Default: 16 dB
8
Rev. 0.1