User guide

Si471x-EVB
Preliminary Rev. 0.4 21
6.2. Si47xx GUI - Analog Property Window
This Analog Property Window controls the various analog audio input properties on the Si471x. Clicking on
Windows
→Properties when in Analog Mode will launch the Analog Property Window as shown in Figure 21.
Figure 21. Si471x Analog Property Window
Table 3. Analog Property Window Explanations
Item Explanation Range
GUI Update Rate
(Sec)
Set the GUI update rate between the computer and the EVB.
0.2–10 Sec
Reference Clock
Frequency
This is the internal Reference Clock Frequency on the chip and it is calcu-
lated by dividing RCLK by the prescaler.
31130–34406 Hz
Reference Clock
Prescaler
Reference Clock Prescaler allow the user to have an RCLK from 32 kHz to
40 MHz. Any RCLK that the user supplies should be divided by this pres-
caler to get as close to 32.768 kHz as possible.
1–4095
Varactor Capaci-
tor Overwrite
This field allows the user to manually overwrite the tuning capacitance. 0
indicates that the tuning cap is automatically adjusted. Any number other
than 0 (1 to 191) will indicate that the tuning cap is manually adjusted.
automatic: 0,
manual: 1–191
Audio Level Low
Threshold (dBFS)
Set the threshold in which an interrupt will be generated when the audio
input level falls below this threshold for the duration greater than the Audio
Level Low Distortion setting. This may be called silence detection indicator
–70 to 0
Audio Level Low
Duration (mSec)
Set the duration for the audio level low before an interrupt is generated.
0–65535