SI4844-DEMO [SILICON]
Si4840/44 DEMO BOARD USERS GUIDE;
| 型号： | SI4844-DEMO |
| 厂家： | 
SILICON |
| 描述： | Si4840/44 DEMO BOARD USERS GUIDE |
| 文件： | 总22页 (文件大小：1612K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Si4840/44-DEMO
Si4840/44 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
FM2
FM3
FM4
FM5
87–108 MHz (Demo Board Default)
86.5–109 MHz
87.3–108.25 MHz
76–90 MHz
64–87 MHz (Demo Board Default)
Worldwide AM band support from 504 to 1750 kHz with 5 default sub-bands:
AM1
AM2
AM3
AM4
AM5
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
SW2
SW3
SW4
SW5
SW6
SW7
SW8
SW9
SW10
SW11
SW12
SW13
SW14
SW15
SW16
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 Si4840/44-
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.
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
3
Lout
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
5
6
7
1
2
3
4
8
9
10 11 12
Band definition:
1: FM1 (87–108 MHz), De-emphasis=75 us, ST indication=6 dB separation@20 dBµV
2: FM5 (64–87 MHz), De-emphasis=75 us, ST indication=6 dB separation@20 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.
DE/SPC
POWER/BAND
UP/VOL+
TREBLE/AL
SETTING
BASS/TMR
MONO/ST
DOWN/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
Button
Hold Time < 1s
Change between FM, AM, and SW (there are 1 FM
band, 1 AM band and 8 SW bands)
None
POWER/BAND
Disable radio function and enter Time mode.
(Radio parameters will be saved to MCU.)
Hold Time > 1s
Enable radio
FM mode: Change De-emphasis, between 50 and
75 us.
DE/SPC
None
AM mode: Change channel space, between 9 kHz
and 10 kHz.
Enter or quit setting
menu.
BASS/TMR
TREBLE/AL
Decrease Bass/Treble level by 1 step.
Increase Bass/Treble level by 1 step.
Enable or disable the
alarm function; enter or
quit alarm setting menu.
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
UP/VOL+
In radio setting menu, change the current parameter
automatically.
In radio working mode, increase volume level auto-
matically until to maximum.
In setting menu, change
the current time/alarm
parameter automatically.
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.
DOWN/VOL- Hold Time < 1s
6
Rev 0.1
Si4840/44-DEMO
Table 1. Key Function Description (Continued)
Time Mode
Tuner Off
FM/AM/SW Radio Mode
Tuner On
Button
In radio setting menu, change the current parameter
automatically.
In setting menu, change
Hold Time > 1s
the current time/alarm In radio working mode, decrease volume level auto-
parameter automatically.
matically until to
minimum.
FM mode: change between forced mono audio and
ST audio.
MONO/ST
Hold Time < 1s
Hold Time > 1s
None
In radio setting menu, change the selected item per
each press.
None
None
SETTING
Quickly return to FM working mode.
Rev 0.1
7
Si4840/44-DEMO
Table 2. Radio Configuration Parameters
FM parameter
Bass/Treble: 0-8
AM Parameter
Bass/Treble: 1-7
SW Parameter
Bass/Treble: 1-7
Default: 3
Default: 4
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
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
7 Tuning preference
a Bass/Treble MODE
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
0.1u
0.47u
100p
10p
1
2
12 C1-2, C6, C19, C24, C37-42, C44 CAP,SM,0603,X7R
2
3
1
4
4
2
2
1
1
1
2
3
2
1
1
1
1
2
1
2
2
2
1
C5, C36
C8-10
CAP,SM,0603,X7R
CAP,SM,0603,COG
CAP,SM,0603,COG
CAP,SM,0603,X7R
CAP,SM,0603,COG
CAP,SM,0603,COG
CAP,SM,0603,COG
CAP,SM,0603,COG
CAP,SM,0603,X7R
CAP,SM,1210,X7R
CAP,SM,0603,COG
CAP,SM,1210,X7R
Electrolytic capacitor
Electrolytic capacitor
RES,SM,0603
3
4
C33
5
C4, C7, C12, C21
C28-29, C32, C35
C11, C20
C30-31
C34
10u
6
22p
7
330p
33n
8
9
33p
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
C15
4.7u
47u
C13
C18, C22
C23, C26, C27
C14, C25
C3
820p
220u
100u/4V
220u/4V
100R
100k
10R
R27
R34
RES,SM,0603
R32
RES,SM,0603
R3, R42
R41
RES,SM,0603
10k
RES,SM,0603
120k
12k
R17, R22
R1-2
RES,SM,0603
RES,SM,0603
1M
R4, R31
R24
RES,SM,0603
1k
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
22R
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
1
2
2
1
2
1
1
1
9
1
1
1
1
1
1
1
1
1
1
2
4
1
1
2
1
1
1
1
1
R13
RES,SM,0603
RES,SM,0603
RES,SM,0603
RES,SM,0603
RES,SM,0603
RES,SM,0603
R5-6
R16, R18
R46
2k
2.2k
4.7M
R19-20
R21
6.8k
NP
R7
RES,SM,0603,Tolerance ±1%
RES,SM,0603,Tolerance ±1%
RES,SM,0603,Tolerance ±1%
RES,SM,0603,Tolerance ±1%
RES,SM,0603,Tolerance ±1%
RES,SM,0603,Tolerance ±1%
RES,SM,0603,Tolerance ±1%
SI484x-A SSOP24
10k 1%
160k 1%
20k 1%
30k 1%
33k 1%
40k 1%
47k 1%
Si4844-A
LM4910MA
TM8795 44 PIN
2N3904
2SC9018
2N3906
BAV99
2.5k/100M
NP
R29
R9-12, R14-15, R28, R33, R35
R43
R36
R8
R44
U1
U2
LM4910MA,SO8
U3
TM8795 44 PIN
Q2
TRANSISTOR NPN SOT23
TRANSISTOR NPN SOT23
TRANSISTOR NPN SOT23
DIODE,SM,ESD,SOT23
FERRITE BEAD,SM,0603
FERRITE BEAD,SM,0603
BUZZER
Q1
Q3
D2 D4
B4, B5, B6, B7
B1
BZ1
Y1-2
D1
D6
J5
BUZZER
32.768KHz
LED
CRYSTAL
LED
1N4148
1N4148
3.5mm
0R
Stereo earphone jack with switch
RES,SM,0603
L1
L2
IND,SM,0603
270nH
Rev 0.1
15
Si4840/44-DEMO
Table 3. Si4840/44-DEMO Board Bill of Materials Rev. 1.3 (Continued)
Item Qty
Reference
Description
Value
120nH
54
55
56
57
58
59
60
61
62
63
64
65
66
2
1
1
1
1
1
4
1
8
1
1
1
1
L3, L4
LCD1
J1
IND,SM,0603
LCD
LCD
BNC VERTICAL
BNC for FM testing
SMA for AM testing
220uH
J6
SMA VERTICAL
ANT1
BAT1
S11-14
S2
AW ferrite stick antenna
BATTERY BOX ,AAA*2 SIZE
One pole two throw switch
Single pole twelve throw switch
Push button DIP
S3-10
S1
Push button
Push button
CONN,TH,1x3,HDR
100k
Push button SM
TP3
CONN,TH,1x3,HDR
VR1
VR2
100k,±10%,Variable resistor(POT)
10k,±20%,Variable resistor(POT)
10k
16
Rev 0.1
Si4840/44-DEMO
6. Schematics and Gerbers
N C
B 1
t
i n o t p s e T
V C C
]
[ 2 N W O D T S H U
B - 2 V R
A - 2 V R
V C C
2
1
T P
T P
V C C
U 1
E _ N L N A
Q I R
T U L O
T U R O
P Y D B
D V D 2
1
2 4
2 3
2 2
2 1
2 0
1 9
1 8
1 7
1 6
1 5
1 4
1 3
2
1 E N T U
2 E N T U
D N B A
N C
3
4
D V D 1
D N B A ] [ 1
5
I L A X T
6
N C
O L A X T
7
I
F M
G F N R D
L K S C
]
[ 2 L K S C
[ 2 O I S D
8
O I S D
]
9
N C
N C
T
R S
1 0
1 1
1 2
G N D
G N D
I
A M
1
3
2
V C C
Rev 0.1
17
Si4840/44-DEMO
R2
1M
D1
C41
0.1u
Tuning indicator
R1
R24
1M
Q3
2N3906
200R
S1
VCC
RESET
C42
0.1u
IRQ
[1]
U3
[1]
XTALI
C32
22p
1
2
33
Y2
BAK
SEG27/IOA4
SEG26/IOA3
SEG25/IOA2
SEG24/IOA1
SEG23
32.768KHz
32
31
30
29
28
27
26
25
24
23
[1]
[1]
[1]
[2]
[2]
[2]
[2]
[2]
[2]
[2]
C35
22p
XIN
SCLK
3
XOUT
GND
RESET
4
SDIO
C37
0.1u
VCC
5
VDD1
VDD2
VDD3
CUP1
CUP2
COM1
COM2
LCD_S12
LCD_S11
LCD_S10
LCD_S9
LCD_S8
LCD_S7
LCD_S6
6
SEG22
C44
7
SEG21
0.1u
8
SEG12(K12)
SEG11(K11)
SEG10(K10)
SEG9(K9)
C38
0.1u
9
10
11
[2]
[2]
LCD_C1
LCD_C2
VCC
C40
0.1u
MCU
FM
LCD1
SLEEP
MW SW
PM
MHz
KHz
MHz
Figure 6. Si4840/44 DEMO Board Rev. 1.3 Schematic – MCU Portion (1 of 2)
18
Rev 0.1
Si4840/44-DEMO
S7
S3
SETTING MENU:
UP/VOL+
S8
POWER/BAND
S4
[2]
[2]
[2]
[2]
KEY_C0
KEY_C1
KEY_C2
KEY_C3
1 BAND TOP
2 BAND BOTTOM
3 BLEND MONO
4 BLEND STEREO
5 BLEND SEPARATION
6 TONE/VOL MODE
7 Tuning preference
DOWN/VOL-
S9
DE/SPC
S5
MONO/ST
S10
BASS/TMR
S6
a Bass/Treble MODE
b Dig-Vol MODE
c MIX MODE1
SETTING
TREBLE/AL
d MIX MODE2
[2]
[2]
KEY_R0
KEY_R1
a preference1
b preference2
c preference3
d preference4
KEY
VCC
R13
22R
C2
0.1u
C3
220u/4V
BZ1
D6
1N4148
R4
1k
Q2
2N3904
[2]
BZ
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
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