Skyworks Si4822-DEMO Manuel utilisateur
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
Rev. 0.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 10, 2021
Si4822/26-DEMO
Si4822/26 DEMO BOARD USER’S GUIDE
1. Features
ATDD (analog tune and digital display) FM/AM/SW radio
Worldwide FM band support from 64 to 109 MHz with 5 default sub-bands:
FM1 87–108 MHz (Demo Board Default)
FM2 86.5–109 MHz
FM3 87.3–108.25 MHz
FM4 76–90 MHz
FM5 64–87 MHz (Demo Board Default)
Worldwide AM band support from 504 to 1750 kHz with 5 default sub-bands:
AM1 520–1710 kHz (Demo Board Default)
AM2 522–1620 kHz (Demo Board Default)
AM3 504–1665 kHz
AM4 520–1730 kHz
AM5 510–1750 kHz
Worldwide SW band support from 2.3 to 28.5 MHz with 16 default sub-bands:
SW1 5.6–6.4 MHz (Demo Board Default, for Si4826 only)
SW2 5.95–6.2 MHz
SW3 6.8–7.6 MHz (Demo Board Default, for Si4826 only)
SW4 7.1–7.6 MHz
SW5 9.2–10 MHz (Demo Board Default, for Si4826 only)
SW6 9.2–9.9 MHz
SW7 11.45–12.25 MHz (Demo Board Default, for Si4826 only)
SW8 11.6–12.2 MHz
SW9 13.4–14.2 MHz (Demo Board Default, for Si4826 only)
SW10 13.57–13.87 MHz
SW11 15–15.9 MHz (Demo Board Default, for Si4826 only)
SW12 15.1–15.8 MHz
SW13 17.1–18 MHz (Demo Board Default, for Si4826 only)
SW14 17.48–17.9 MHz
SW15 21.2–22 MHz (Demo Board Default, for Si4826 only)
SW16 21.45–21.85 MHz
Twelve positions band switch or one push button for selecting different band according to the target
application.
Two AAA battery operations with working voltage down to 2.0 V
Economical potentiometer for frequency tuning replaces more expensive variable capacitor (PVC)
Potentiometer and/or push button volume control
FM 50 µs or 75 µs (default) de-emphasis
9-level Bass/Treble via push button control for FM
7-level Bass/Treble via push button control for AM/SW
FM/AM/SW band indicator and frequency display in LCD
2×4 matrix keypad interface
The frequency range of each band, de-emphasis and AM channel space can be re-configured by host MCU.
Si4822/ 26-DEMO
2 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
Rev. 0.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 10, 2021
2. Overview
This manual describes the operation of the Skyworks Solutions Si4822/26-DEMO Board Rev1.0, October 24,
2011. The Skyworks Solutions Si4822/26-DEMO Board is designed with the 24-pin SSOP-packaged Si4822/26
chip, the revolutionary single chip AM/FM/SW receiver that integrates everything from antenna input to audio
output and allows use of common and economical potentiometers to do the frequency tuning. It provides a
complete portable analog tune digital display AM/FM/SW radio design. The LCD displays the tuning information.
The Si4822/26-DEMO is designed with 1-layer PCB, allowing the lowest cost without sacrificing the RF
performance. The demo board works with two AAA batteries and working voltage down to 2.0 V.
Si4822/26-DEMO
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 3
Rev. 0.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 10, 2021
3. Description
Figure 1 and Figure 2 shows the physical layout of the board with key components indicated.
Figure 1. Si4822/26-DEMO Board Top Side in Time Mode
Figure 2. Si4822/26-DEMO Board Bottom Side
Si4822/ 26-DEMO
4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
Rev. 0.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 10, 2021
Power:
BAT1: 2 cells AAA battery compartment
Audio Connectors:
J5: Stereo audio headphone output
Antenna Selections:
AM antenna: Ferrite stick antenna for AM
J6: SMA connector for AM conductive testing
S11: AM antenna selector
J1: BNC connector for FM/ SW conductive testing or FM whip antenna
S12: FM antenna selector
Radio Band Selection:
The demo board provides two methods for selecting the radio band: one is to use the slide switch S2, another is to
use the POWER/BAND button. S14 determines which method is in use.
S14:
1-2: SMA for AM Conductive Test
2-3: AM Ferrite Antenna
3
2
1
1-2: BNC (J1)
2-3: HP ANT (J5)
3
2
1
1-2: Use slide switch to select band
2-3: Use push button to select band
3
2
1
Si4822/26-DEMO
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 5
Rev. 0.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 10, 2021
Radio Band Property Setting:
S13:
Audio Output Test Point:
For the general specification test, TP3 is the recommended audio signal test point. The audio test instrument
should be connected to TP3 to get more accurate test results. J5 can also be used as an audio test point, but the
test results may not be entirely accurate under some circumstances.
Main Components:
U1: Skyworks Solutions Si4822/26 AM/FM/SW ATDD receiver
U2: Audio amplifier
U3: MCU
LCD: The digital display of tuning frequency
3
2
1
1-2: Use the keypad to set the band propery via MCU
2-3: Use the tuner default band setting values
2
1GND
AOUT
Si4822/ 26-DEMO
6 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
Rev. 0.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 10, 2021
Control Interface:
VR1: Frequency tuning wheel
VR2: Volume control wheel
S3~S8, S10: The keypad
S2: Band slide switch for FM, AM, and SW
Band definition:
1: FM1 (87–108 MHz), De-emphasis = 75 µs
2: FM5 (64–87 MHz), De-emphasis = 75 µs
3: AM1 (520–1710 kHz), 10 kHz spacing
4: AM2 (522–1620 kHz), 9 kHz spacing
5: SW1 (5.6–6.4 MHz)
6: SW3 (6.8–7.6 MHz)
7: SW5 (9.2–10.0 MHz)
8: SW7 (11.45–12.25 MHz)
9: SW9 (13.4–14.2 MHz)
10: SW11 (15–15.9 MHz)
11: SW13 (17.1–18 MHz)
12: SW15 (21.2– 22 MHz)
Human Interface:
There are seven keys for controlling the demo board as shown below:
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 that can be configured
are listed in Table 2.
3
2
145 6
789 11
10 12
TREBLE/AL BASS/TMR DE/SPC
SETTING DOWN/VOL- UP/VOL+ POWER/BAND
Si4822/26-DEMO
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 7
Rev. 0.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 10, 2021
Table 1. Key Function Description
Button/Mode Time Mode
Tuner Off
FM/AM/SW Radio Mode
Tuner On
POWER/BAND hold Time
< 1s
None Change between FM, AM, and SW (1 FM
band, 1 AM band and 8 SW bands)
hold Time
> 1s
Enable radio Disable radio function and enter Time mode
(Radio parameters will be saved to MCU).
DE/SPC None FM mode: Change De-emphasis, between
50 µs and 75 µs.
AM mode: Change channel space, between
9 kHz and 10 kHz.
BASS/TMR Enter or quit time setting menu. 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
In setting menu, change the
current time/alarm parameter
by one unit per each press.
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.
hold Time
> 1s
In setting menu, change the
current time/alarm parameter
automatically.
In radio setting menu, change the current
parameter automatically.
In radio working mode, increase volume
level automatically until to maximum.
DOWN/VOL- hold Time <
1s
In setting menu, change the
current time/alarm parameter
by one unit per each press.
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.
hold Time
> 1s
In setting menu, change the
current time/alarm parameter
automatically.
In radio setting menu, change the current
parameter automatically.
In radio working mode, decrease volume
level automatically until to minimum.
SETTING hold Time <
1s
None In radio setting menu, change the selected
item per each press.
hold Time
> 1s
None Quickly return to FM working mode.
Si4822/ 26-DEMO
8 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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Notes:
Tone/VOL mode has four selections:
Bass/treble mode: no digital volume control, fixed volume level at 59
Digital volume mode: no bass/treble effect, volume levels from 0 to 63
Mixed mode 1: bass/treble and digital volume coexist, volume levels from 0 to 63, scale to 0~59
Mixed mode 2: bass/treble and digital volume coexist, volume levels from 0 to 63
The Tuning preference of FM has two selections:
Preference1: When tuning to adjacent channels, the volume level decreases by 2 dB
Preference2: When tuning to adjacent channels, the volume level remains unchanged
The Tuning preference of SW has two selections:
Preference1: When tuning to adjacent channels, the volume level decreases by 2 dB
Preference2: When tuning to adjacent channels, the volume level remains unchanged
There is no tuning preference selection for AM mode.
Table 2. Radio Configuration Parameters
FM Parameter AM Parameter SW Parameter
Bass/Treble: 0-8
Default: 4
Bass/Treble: 1-7
Default: 3
Bass/Treble: 1-7
Default: 3
Digital volume: 0-63
Default: 63
Digital volume: 0-63
Default: 63
Digital volume: 0-63
Default: 63
Band top: max 109 MHz
Default: 108 MHz
Band top: max 1750 kHz
Default: 1710 kHz
Band top: max 28.5 MHz
Default: 6.4/7.6/10/12.25/14.2/15.9/18/22 MHz
for SW1 to SW8 respectively
Band bottom: min 64 MHz
Default: 87.5 MHz
Band bottom: min 504 kHz
Default: 522 kHz
Band bottom: min 2.3 MHz
Default: 5.6/6.8/9.2/11.45/13.4/15/17.121.2 MHz
for SW1 to SW8 respectively
Band range: max 22 MHz Band range: max 2.2 MHz Band range: max 1.1 MHz
De-emphasis: 50 or 75 µs
Default: 75 µs
Channel space: 9 or 10 kHz
Default: 9 kHz
Tone/VOL mode: a-d
Default: d
Tuning preference: a-d
Default: b
Si4822/26-DEMO
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 9
Rev. 0.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 10, 2021
4. Operation
The Si4822/26-DEMO board, a complete analog tune and digital display radio, provides two major modes of
operation: Time mode and FM/AM/SW Radio mode.
4.1. Time Mode
Place two AAA batteries into the battery compartment. The board will automatically enter Time mode and display
the time.
The demo board display in Time mode is illustrated in Figure 1.
4.1.1. Time Setting
The time default value is 00:00 and can be set to the correct time manually when needed.
1. In Time mode, press the BASS/TMR button to enter the setting menu. The default is to set the minute item
first. Press this button again to select the hour item. The selected item flashes.
2. While the selected item is flashing, press the DOWN/VOL- and UP/VOL+ button to set the desired time.
3. When you have finished setting the time, press BASS/TMR button to quit the setting menu. The MCU will
automatically quit the setting menu if there is no operation within 2 seconds.
4.1.2. Alarm Setting
1. In Time mode, press the TREBLE/AL button to enable or disable the alarm function and to enter the setting
menu automatically when the alarm is enabled. Once you have entered the setting menu, the default is to
set the minute item first. Pressing this button again will select the hour item. The selected item flashes.
2. While the selected item is flashing, press the DOWN/VOL- and UP/VOL+ button to set the desired time.
3. When you have finished the alarm setting, press TREBLE/AL button to quit the set menu. The MCU will
automatically quit the setting menu if there is no operation within 2 seconds.
4. If the alarm is enabled and the alarm setting time is matched, the radio will be automatically turned on after
the buzzer sounds for 5 seconds.
5. The radio will be turned off and the demo board will go into sleep mode automatically if there is no
operation on the push buttons within 15 minutes; if there is any operation on the push buttons, the auto-
sleep function will be disabled. The radio keeps working throughout this time.
Si4822/ 26-DEMO
10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
Rev. 0.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 10, 2021
4.2. FM/AM/SW Radio Mode
In time mode, the device will enter FM/AM/SW mode after a long press (hold time > 1s) of the POWER/BAND
button or when the alarm time is reached. The LCD displays the following information: band indicator, band
frequency indicator, and sleep indicator in case the radio is automatically turned on by the alarm.
The demo board display in FM/AM/SW mode is illustrated in Figure 3.
Figure 3. LCD Display in FM Radio Mode
The demo board provides two methods to select the radio band: one is to use the slide switch (S2), the other is to
use the POWER/BAND push button. S14 determines which method is in use.
The demo board also provides two methods to set the band property: one is to use tuner default values, the other
is to use the keypad to reconfigure band property value via the MCU. S13 determines which method is in use. If
you use the tuner default values, the band property is fixed and cannot be re-configured. Refer to Section "4.2.1.
MCU Setting Band Property” for the operation details for setting the band property using the keypad.
To operate the demo board, follow these procedures:
1. According to the desired radio band selection method, set S14 to use the slide switch or push button.
2. According to the desired radio band property, set S13 to use tuner default values or reconfigure the band
property.
3. Hold the POWER/BAND push button (hold time > 1s) or when the alarm time is reached, the device will
enter FM/AM/SW mode.
4. Use slide switch S2 or press the POWER/BAND push button to select the desired band.
5. Refer to section "4.2.1. MCU Setting Band Property” or section "4.2.2. MCU Setting Radio Working Mode”
to reconfigure the band property or radio working mode if necessary.
6. Rotate the tuning wheel and find the desired radio station with the help of the LCD display and/or tuning
indicator D1.
7. Rotate the volume control wheel VR2 and/or press the DOWN/VOL- or UP/VOL+ button to get a
comfortable volume. Press the BASS/TMR or TREBLE/AL button to get the desired bass/treble level.
Notes:
For FM listening, the earphone cable must be connected to the board when S12 is set to HP ANT or an
external antenna must be connected to the BNC connector when S12 is set to BNC.
For AM listening, the ferrite antenna must be connected to the board and the S11 is set to Ferrite before
turning on the radio or switching the band to AM.
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1
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