Si484x-Demo Board User Guide
Si4840/44-DEMO
Si4840/44 D EMO B OARD U SER ’ S G UIDE
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
FM2
FM3
FM4
FM5

Worldwide AM band support from 504 to 1750 kHz with 5 default sub-bands:
AM1
AM2
AM3
AM4
AM5

SW2
SW3
SW4
SW5
SW6
SW7
SW8
SW9
SW10
SW11
SW12
SW13
SW14
SW15
SW16










520–1710 kHz (Demo Board Default)
522–1620 kHz(Demo Board Default)
504–1665 kHz
520–1730 kHz
510–1750 kHz
Worldwide SW band support from 2.3 MHz to 28.5 MHz with 16 default sub-bands:
SW1

87–108 MHz (Demo Board Default)
86.5–109 MHz
87.3–108.25 MHz
76–90 MHz
64–87 MHz (Demo Board Default)
5.6–6.4 MHz (Demo Board Default, for Si4844 only)
5.95–6.2 MHz
6.8–7.6 MHz (Demo Board Default, for Si4844 only)
7.1–7.6 MHz
9.2–10 MHz (Demo Board Default, for Si4844 only)
9.2–9.9 MHz
11.45–12.25 MHz (Demo Board Default, for Si4844 only)
11.6–12.2 MHz
13.4–14.2 MHz (Demo Board Default, for Si4844 only)
13.57–13.87 MHz
15–15.9 MHz (Demo Board Default, for Si4844 only)
15.1–15.8 MHz
17.1–18 MHz (Demo Board Default, for Si4844 only)
17.48–17.9 MHz
21.2–22 MHz (Demo Board Default, for Si4844 only)
21.45–21.85 MHz
Twelve-position slide switch or one push button for selecting different bands 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
FM stereo indication threshold 6 dB separation at 20 dBµv RF input (default) or 12 dB separation at 28 dBµv RF
input
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
2x4 matrix keypad
The frequency range of each band, the ST indication threshold, de-emphasis and AM channel space can be
reconfigured by host MCU.
Rev 0.1 8/11
Copyright © 2011 by Silicon Laboratories
Si4840/44-DEMO
Si4840/44-DEMO
2. Overview
This manual describes the operation of the Silicon Labs Si4840/44-DEMO board, Rev 1.3, June 30, 2011. The
Silicon Laboratories Si4840/44 DEMO board is designed with the 24-pin SSOP-packaged Si4840/44 chip, the
revolutionary single chip AM/FM/SW receiver that integrates everything from antenna output to audio input 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 Si4840/44DEMO 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.
3. Description
Figure 1 and Figure 2 show the physical layout of the board with key components indicated.
Figure 1. Si4840/44-DEMO Board Top Side in Time Mode
2
Rev 0.1
Si4840/44-DEMO
Figure 2. Si4840/44-DEMO Board Bottom Side
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 test
S11: AM antenna selection
1
2
3
1-2: SMA for AM Conductive Test (J6)
2-3: AM ferrite antenna
J1: BNC connector for FM/SW conductive test or FM whip antenna
Rev 0.1
3
Si4840/44-DEMO
S12: FM antenna selection
1
2
3
1-2 BNC (J1)
2-3 HP ANT (J5)
Radio Band selection:
The Demo board provides 2 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.
S14:
3
2
1
2-3: Use slide switch to select band
1-2: Use push button to select band
Radio Band Property setting:
S13:
1
2
3
1-2: Use the keypad to set the band property via MCU
2-3: Use the tuner default band setting values
4
Rev 0.1
Si4840/44-DEMO
Audio output test point:
For 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.
TP3:
1
GND
2
Lout
3
Rout
Main components:
U1: Silicon Laboratories Si484x FM/AM/SW ATDD tuner
U2: Audio amplifier
U3: MCU
LCD: The digital display of tuning information
Control interface:
VR1: Frequency tuning wheel
VR2: Volume control wheel
S3~S10: The keypad for human interface
S2: Band slide switch for FM, AM, and SW
1
2
3
4
5
6
7
8
9
10
11
12
Band definition:
1: FM1 (87–108 MHz), De-emphasis=75 us, ST indication=6 dB [email protected] dBµV
2: FM5 (64–87 MHz), De-emphasis=75 us, ST indication=6 dB [email protected] dBµV
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)
Rev 0.1
5
Si4840/44-DEMO
Human Interface:
There are 8 keys for controlling the demo board as shown below.
TREBLE/AL
BASS/TMR
DE/SPC
POWER/BAND
SETTING
MONO/ST
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 in Table 2.
Table 1. Key Function Description
Time Mode
Tuner Off
FM/AM/SW Radio Mode
Tuner On
Hold Time < 1s
None
Change between FM, AM, and SW (there are 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.)
Button
POWER/BAND
FM mode: Change De-emphasis, between 50 and
75 us.
AM mode: Change channel space, between 9 kHz
and 10 kHz.
DE/SPC
None
BASS/TMR
Enter or quit 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.
In setting menu, change
In radio setting menu, change the current parameter
the current time/alarm
by one unit per each press. In radio working mode,
Hold Time < 1s
parameter by one unit per
increase volume 1 step per each press.
each press.
UP/VOL+
Hold Time > 1s
DOWN/VOL-
6
In radio setting menu, change the current parameter
In setting menu, change
automatically.
the current time/alarm
In radio working mode, increase volume level autoparameter automatically.
matically until to maximum.
In setting menu, change
In radio setting menu, change the current parameter
the current time/alarm
by one unit per each press. In radio working mode,
Hold Time < 1s
parameter by one unit per
decrease volume 1 step per each press.
each press.
Rev 0.1
Si4840/44-DEMO
Table 1. Key Function Description (Continued)
Button
Hold Time > 1s
Time Mode
Tuner Off
FM/AM/SW Radio Mode
Tuner On
In radio setting menu, change the current parameter
automatically.
In setting menu, change
the current time/alarm In radio working mode, decrease volume level automatically until to
parameter automatically.
minimum.
None
FM mode: change between forced mono audio and
ST audio.
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.
MONO/ST
SETTING
Rev 0.1
7
Si4840/44-DEMO
Table 2. Radio Configuration Parameters
FM parameter
AM 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:
6.4/7.6/10/12.25/14.2/1
5.9/18/22 MHz for
SW1 to SW8
respectively.
Band Bottom: Min 64 MHz
Default: 87.5 MHz
Band Bottom: Min 504 MHz Band Bottom: Min 2.3
MHz
Default: 522 MHz
Default:
5.6/6.8/9.2/11.45/13.4/
15/17.1/21.2 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 s
Channel space: 9 or 10 kHz
Default: 9 kHz
Blend mono: 0-127 dBµV
Default: 8 dBµV
Blend stereo: 0-127 dBµV
Default: 49 dBµV
Blend separation: 0-100%
Default: 50%
Tone/VOL mode: a-d
Default: d
Tuning preference: a-d
Default: a
8
SW Parameter
Rev 0.1
Si4840/44-DEMO
Notes:
Tone/VOL mode has 4 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 mode has 4 selections:

Preference 1: When tuning to adjacent channels, allow stereo separation and stereo indicator is on, volume
level decreases by 2 dB.
 Preference 2: When tuning to adjacent channels, allow stereo separation and stereo indicator is on, volume
level is unchanged.
 Preference 3: When tuning to adjacent channels, disable stereo separation and stereo indicator is off, volume
level decreases by 2 dB.
 Preference 4: When tuning to adjacent channels, disable stereo separation and stereo indicator is off, volume
level is unchanged.
The tuning preference of SW mode has 2 selections:

Preference 1: When tuning to adjacent channels, the volume level decreases by 2 dB.
Preference 2: When tuning to adjacent channels, the volume level remains unchanged.
There is no tuning preference selection for AM mode.

Rev 0.1
9
Si4840/44-DEMO
4. Operation
The Si4840/44-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
Put 2 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 the BASS/TMR button to quit the setting menu. The MCU
automatically quits 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 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. 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 the alarm setting, press the TREBLE/AL button to quit the setting menu. The MCU
automatically quits 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 buttons within 15 minutes; if there is any operation on the buttons, the auto-sleep function will be disabled.
The radio keeps working throughout this time.
4.2. FM/AM/SW Radio Mode
In Time Mode, long press (hold time >1s) the POWER/BAND button or when the alarm time is reached, the device
will enter FM/AM/SW mode. The LCD displays the following information: band indicator, band frequency indicator,
stereo indicator, and sleep indicator in case radio is automatically turned on by the alarm.
The demo board display in FM/AM/SW Mode is illustrated in Figure 3.
10
Rev 0.1
Si4840/44-DEMO
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 the tuner default values; the
other is to use the keypad to reconfigure the 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 reconfigured. 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 Radio 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 turning 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.
Rev 0.1
11
Si4840/44-DEMO
4.2.1. MCU Setting Band Property
The demo board provides the function that the band property can be set by MCU. The band property includes:

Band top
Band bottom
 Blend mono (only for FM)
 Blend stereo (only for FM)
 Blend separation (only for FM)
 De-emphasis (only for FM)
 Channel Space (only for AM)
The setting menu is illustrated in Figure 4.

To set the band properties, follow these steps:
1. Press the SETTING button to enter the setting menu and select the item to be set. The selected item flashes for
1 second, then automatically switches to its current value.
2. While the value is flashing, press the DOWN/VOL- or UP/VOL+ button to set the desired value within 3
seconds.
3. Repeat steps 1 and 2 to finish setting the band properties.
4. When the band properties are set, the MCU automatically quits the setting menu if there is no operation within 3
seconds.
5. In FM working mode, press the DE/SPC button to set the De-emphasis to 50 or 75 µs.
6. IN AM working mode, press the DE/SPC button to set the Channel Space to 9 kHz or 10 kHz.
SETTING MENU:
1 BAND TOP
2 BAND BOTTOM
3 BLEND MONO
4 BLEND STEREO
5 BLEND SEPARATION
6 TONE/VOL MODE
a Bass/Treble MODE
7 Tuning preference
b Dig-Vol MODE
c MIX MODE1
d MIX MODE2
a preference1
b preference2
c preference3
d preference4
Figure 4. Setting Menu
12
Rev 0.1
Si4840/44-DEMO
4.2.2. MCU Setting Radio Working Mode
The host MCU can set the radio working mode. The working mode includes:

Tone/volume mode (only for FM mode), item 6 in the setting menu
Tuning preference (only for the FM and SW), item 7 in the setting menu
 Forced mono audio/ST audio (only for FM)
To set the radio working mode, follow these steps:

1. Press the SETTING button to enter item 6. The LCD displays the item number st6 for 1 second, then
automatically switches to its mode indication.
2. Press the DOWN/VOL– or UP/VOL+ button to select the desired mode within 3 seconds.
3. Repeat steps 1 and 2 to set the tuning preference by setting item 7.
4. When the radio working mode is set, the MCU automatically quits the setting menu if there is no operation
within 3 seconds.
5. Press the MONO/ST button to select forced mono audio or ST audio in FM mode when necessary.
Rev 0.1
13
Si4840/44-DEMO
5. Bill of Materials

ATDD AM/FM/SW receiver IC Si484x with external 32.768 kHz crystal oscillator support
 LM4910MA Audio Amplifier IC
 TM8795 MCU
See Table 3 for details.
Table 3. Si4840/44-DEMO Board Bill of Materials Rev. 1.3
Item Qty
Reference
Description
Value
1
12
C1-2, C6, C19, C24, C37-42, C44
CAP,SM,0603,X7R
0.1u
2
2
C5, C36
CAP,SM,0603,X7R
0.47u
3
3
C8-10
CAP,SM,0603,COG
100p
4
1
C33
CAP,SM,0603,COG
10p
5
4
C4, C7, C12, C21
CAP,SM,0603,X7R
10u
6
4
C28-29, C32, C35
CAP,SM,0603,COG
22p
7
2
C11, C20
CAP,SM,0603,COG
330p
8
2
C30-31
CAP,SM,0603,COG
33n
9
1
C34
CAP,SM,0603,COG
33p
10
1
C15
CAP,SM,0603,X7R
4.7u
11
1
C13
CAP,SM,1210,X7R
47u
12
2
C18, C22
CAP,SM,0603,COG
820p
13
3
C23, C26, C27
CAP,SM,1210,X7R
220u
14
2
C14, C25
Electrolytic capacitor
100u/4V
15
1
C3
Electrolytic capacitor
220u/4V
16
1
R27
RES,SM,0603
100R
17
1
R34
RES,SM,0603
100k
18
1
R32
RES,SM,0603
10R
19
2
R3, R42
RES,SM,0603
10k
20
1
R41
RES,SM,0603
120k
21
2
R17, R22
RES,SM,0603
12k
22
2
R1-2
RES,SM,0603
1M
23
2
R4, R31
RES,SM,0603
1k
24
1
R24
RES,SM,0603
200R
14
Rev 0.1
Si4840/44-DEMO
Table 3. Si4840/44-DEMO Board Bill of Materials Rev. 1.3 (Continued)
Item Qty
Reference
Description
Value
25
1
R13
RES,SM,0603
22R
26
2
R5-6
RES,SM,0603
2k
27
2
R16, R18
RES,SM,0603
2.2k
28
1
R46
RES,SM,0603
4.7M
29
2
R19-20
RES,SM,0603
6.8k
30
1
R21
RES,SM,0603
NP
31
1
R7
RES,SM,0603,Tolerance ±1%
10k 1%
32
1
R29
RES,SM,0603,Tolerance ±1%
160k 1%
33
9
R9-12, R14-15, R28, R33, R35
RES,SM,0603,Tolerance ±1%
20k 1%
34
1
R43
RES,SM,0603,Tolerance ±1%
30k 1%
35
1
R36
RES,SM,0603,Tolerance ±1%
33k 1%
36
1
R8
RES,SM,0603,Tolerance ±1%
40k 1%
37
1
R44
RES,SM,0603,Tolerance ±1%
47k 1%
38
1
U1
SI484x-A SSOP24
39
1
U2
LM4910MA,SO8
LM4910MA
40
1
U3
TM8795 44 PIN
TM8795 44 PIN
41
1
Q2
TRANSISTOR NPN SOT23
2N3904
42
1
Q1
TRANSISTOR NPN SOT23
2SC9018
43
1
Q3
TRANSISTOR NPN SOT23
2N3906
44
2
D2 D4
DIODE,SM,ESD,SOT23
BAV99
45
4
B4, B5, B6, B7
FERRITE BEAD,SM,0603
2.5k/100M
46
1
B1
FERRITE BEAD,SM,0603
NP
47
1
BZ1
BUZZER
BUZZER
48
2
Y1-2
CRYSTAL
32.768KHz
49
1
D1
LED
50
1
D6
1N4148
1N4148
51
1
J5
Stereo earphone jack with switch
3.5mm
52
1
L1
RES,SM,0603
0R
53
1
L2
IND,SM,0603
270nH
Rev 0.1
Si4844-A
LED
15
Si4840/44-DEMO
Table 3. Si4840/44-DEMO Board Bill of Materials Rev. 1.3 (Continued)
Item Qty
Reference
Description
Value
54
2
L3, L4
IND,SM,0603
55
1
LCD1
LCD
56
1
J1
BNC VERTICAL
BNC for FM testing
57
1
J6
SMA VERTICAL
SMA for AM testing
58
1
ANT1
AW ferrite stick antenna
59
1
BAT1
BATTERY BOX ,AAA*2 SIZE
60
4
S11-14
One pole two throw switch
61
1
S2
Single pole twelve throw switch
62
8
S3-10
Push button DIP
Push button
63
1
S1
Push button SM
Push button
64
1
TP3
CONN,TH,1x3,HDR
65
1
VR1
100k,±10%,Variable resistor(POT)
100k
66
1
VR2
10k,±20%,Variable resistor(POT)
10k
16
Rev 0.1
120nH
LCD
220uH
CONN,TH,1x3,HDR
Rev 0.1
2.5k/100M
B6
LNA_EN
[1]
R34
100k
33n
C30
R41
120k
C31
33n
R32
10R
10p
R31
1k
C33
S11
Q1
2SC9018
VCC
3
2
RESET [2]
12
10k
R3
C19
0.1u
11
2k
R6
C34
33p
L2
270nH
47u
100R
R27
0.1u
VR1
100k 10%
C28
22p
32.768KHz
Y1
R46
4.7M
C6
C15
C29
22p
R21
NC
0.1u 4.7u
2
U1
1
3
Si4840/44-A
S13
[1] TUNE1
[2]
IRQ
[1] LNA_EN
10k
R42
[2] XTALI
C4
10u
C7
10u
VCC
C39
0.1u
VCC
L4
120nH
L3
120nH
C14
100u/4V
10u
C21
10u
C12
2-1 MCU Setting
2-3 Tuner default
S13: Band property
BAT1
AAA*2
R18
2k2
R16
2k2
820p
C22
820p
C18
12k
R17
12k
R22
R5
2k
4
3
2
1
U2
C11
LM4910MA
GND
SHUTDOWN
IN2
IN1
R20
C20
6k8
R19
330p
C25
100u/6.3V
VDD
VO3
VO2
VO1
330p
6k8
5
6
7
8
C24
0.1u
C27
220u
C26
220u
C23
220u
TP3
C8
100p
C9
100p
C10
100p
3
2
1
B4 2k5/100M
B7 2k5/100M
B5 2k5/100M
Rout
GND
Lout
1
2
3
[1] FMI
Audio output
J5
BAND [1]
2-1 push button
2-3 slide switch
S14
2
S14: Band Selection
Figure 5. Si4840/44 DEMO Board Rev 1.3 Schematic–Radio and Audio Portions
D2
BAV99
C5
0.47u
1
S12
9
C36
0.47u
[1] FMI
10
AMI
GND
13
NC
GND
14
8
FMI
RFGND
6
SDIO
17
SCLK [2]
NC
[1] BAND
5
SCLK
16
SDIO [2]
RST
15
7
18
NC
4
NC
XTALO
19
XTALI
3
BAND
VDD1
20
1
LNA_EN
2
TUNE2
VDD2
21
IRQ
TUNE1
DBYP
22
ROUT
23
LOUT
24
C1
TP2
C13
TP1
L1
0R/120nH
VCC
J6
VCC
VR2-A
VR2-B
MW
Test point
ANT1
MW ferrite antenna
[2]
SHUTDOWN
VCC
J1
B1
D4
BAV99
NC
FM/SW
3
1
VCC
1
S2
2
3
4
5
6
7
8
9
10
11
12
13
TUNE1 [1]
R44
47k 1%
R33
20k 1%
R29
160k 1%
20k 1%
R28
10k 1%
R7
40k 1%
R8
R9
20k 1%
R14
20k 1%
R11
20k 1%
R12
20k 1%
R10
20k 1%
R15
20k 1%
R35
20k 1%
R43
30k 1%
R36
33k 1%
FM1 (87MHz - 108MHz)
FM5 (64MHz - 87MHz)
AM1 (520kHz - 1710kHz)
AM2 (522kHz - 1620kHz)
SW1 (5.6MHz - 6.4MHz)
SW3(6.8MHz - 7.6MHz)
SW5(9.2MHz - 10.0MHz)
SW7(11.45MHz - 12.25MHz)
SW9 (13.4MHz - 14.2MHz)
SW11 (15MHz - 15.9MHz)
SW13 (17.1MHz - 18MHz)
SW15 (21.2MHz - 22MHz)
Si4840/44-DEMO
6. Schematics and Gerbers
17
18
FM
MW SW
Rev 0.1
XIN
SEG27/IOA4
SEG26/IOA3
XOUT
SEG25/IOA2
GND
SEG24/IOA1
SEG23
SEG22
VDD3
SEG21
CUP1
SEG12(K12)
CUP2
SEG11(K11)
COM1
SEG10(K10)
SEG9(K9)
SLEEP
[2] LCD_S13
SEG28/IOB1/ELC
SEG29/IOB2/ELP
SEG30/IOB3/BZB
SEG31/IOB4/BZ
SEG32/IOC1/KI1
34
35
36
37
38
39
40
41
[2] LCD_S13
[1] SHUTDOWN
[2] BZ
[2] KEY_C0
[2] KEY_C1
[2] KEY_C2
[2] KEY_C3
R24
VCC
Q3
2N3906
17
[2] LCD_S12
SEG8(K8)
SEG7(K7)
SEG6(K6)
SEG5(K5)
VDD2
16
[2] LCD_S11
22
21
20
19
SEG4(K4)
SEG33/IOC2/KI2
SEG34/IOC3/KI3
D1
Tuning indicator
SEG13
15
[2] LCD_S10
[2]
[2]
LCD_S4
LCD_S5
[2]
[2]
LCD_S3
LCD_S2
18
VDD1
SEG12
14
[2] LCD_S9
[2] LCD_S8
[2]
LCD_S1
SEG3(K3)
SEG2(K2)
COM2
SEG11
SEG10
13
12
11
[2] LCD_S7
[2]
LCD_S0
17
16
42
S1
SEG9
SEG8
SEG7
[2] LCD_S6
[2]
BAK
SEG35/IOC4/KI4
C32
22p
KEY_R1
SEG1(K1)
C42
0.1u
10
[2] LCD_S5
15
43
44
RESET
9
[2]
RESET
INT
TEST
VCC
SEG6
SEG5
KEY_R0
11
COM5
10
14
LCD_C1 [2]
LCD_C2 [2]
COM4
9
[2] LCD_S4
VCC
COM3
C38
0.1u
13
12
8
8
[2]
7
SEG4
LCD_C3
C44
0.1u
[2] LCD_S3
XTALI [1]
7
6
[2] LCD_S2
5
6
U3
SEG3
4
[2] LCD_S1
R1
1M
SEG2
3
[2] LCD_S0
2
5
1
4
Y2
32.768KHz
SEG1
3
C35
22p
SEG0
COM3
[2] LCD_C3
[2] LCD_C2
[2] LCD_C1
C37
0.1u
VCC
2
1
C41
0.1u
COM2
COM1
Si4840/44-DEMO
R2
1M
200R
IRQ [1]
33
32
[1]
SCLK
31
[1]
RESET
30
[1]
SDIO
29
[2]
LCD_S12
28
[2]
LCD_S11
27
[2]
LCD_S10
26
[2]
LCD_S9
25
[2]
LCD_S8
24
[2]
LCD_S7
23
[2]
LCD_S6
C40
0.1u
MCU
LCD1
PM
MHz
KHz
MHz
Figure 6. Si4840/44 DEMO Board Rev. 1.3 Schematic – MCU Portion (1 of 2)
Si4840/44-DEMO
S7
S3
UP/VOL+
KEY_C0
[2]
KEY_C1
[2]
KEY_C2
[2]
S8
S4
DOWN/VOL-
DE/SPC
S9
S5
MONO/ST
BASS/TMR
S10
S6
SETTING
KEY_C3
[2]
KEY_R0
[2]
KEY_R1
[2]
SETTING MENU:
POWER/BAND
1 BAND TOP
2 BAND BOTTOM
3 BLEND MONO
4 BLEND STEREO
5 BLEND SEPARATION
6 TONE/VOL MODE
7 Tuning preference
TREBLE/AL
a Bass/Treble MODE
b Dig-Vol MODE
c MIX MODE1
d MIX MODE2
a preference1
b preference2
c preference3
d preference4
KEY
VCC
R13
22R
C2
0.1u
C3
220u/4V
D6
1N4148
R4
BZ
BZ1
Q2
2N3904
[2]
1k
BUZZER
Figure 7. Si4840/44 DEMO Board Rev. 1.3 Schematic – MCU Portion (2 of 2)
Rev 0.1
19
Si4840/44-DEMO
Figure 8. Si4840/44-DEMO Board Gerber Rev 1.3
20
Rev 0.1
Si4840/44-DEMO
NOTES:
Rev 0.1
21
Smart.
Connected.
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Quality
Support and Community
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Disclaimer
Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers
using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific
device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories
reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy
or completeness of the included information. Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein. This document does not imply
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