Si4844-B-Demo Board Users Guide
Si4844-B-DEMO
Si4844-B D EMO B OARD U SER ’ S G U I D E
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)
86.5–109 MHz
FM3 87.3 –108.25 MHz
FM4 76– 90 MHz
FM5 64–87 MHz (Demo Board Default)
FM2
Worldwide
AM band support from 504 kHz to 1750 kHz with 5 default sub-bands:
AM1
520–1710 kHz (Demo Board Default)
522–1620 kHz (Demo Board Default)
AM3 504–1665 kHz
AM4 520–1730 kHz
AM5 510 –1750 kHz
AM2
Worldwide
SW band support from 2.3 to 22 MHz with 16 default sub-bands:
SW1
5.6–6.4 MHz (DEMO Board Default)
SW2 5.95–6.2 MHz
SW3 6.8–7.6 MHz (DEMO Board Default)
SW4 7.1–7.6 MHz
SW5 9.2 –10 MHz (DEMO Board Default)
SW6 9.2–9.9 MHz
SW7 11.45 –12.25 MHz (DEMO Board Default)
SW8 11.6–12.2 MHz
SW9 13.4–14.2 MHz (DEMO Board Default)
SW10 13.57 - 13.87 MHz
SW11 15–15.9 MHz (DEMO Board Default)
SW12 15.1–15.8 MHz
SW13 17.1–18 MHz (DEMO Board Default)
SW14 17.48–17.9 MHz
SW15 21.2–22 MHz (DEMO Board Default)
SW16 21.45–21.85 MHz
Supports
wider FM/SW band range
Twelve positions 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
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
The frequency range of each band, de-emphasis, and AM channel space can be re-configured by host
MCU.
Rev. 0.1 5/13
Copyright © 2016 by Silicon Laboratories
Si4844-B-DEMO
Si4844-B-DEMO
2. Overview
This manual describes the operation of the Silicon Labs Si4844 DEMO board Rev1.4, Mar 12, 2013. The Silicon
Laboratories Si4844-DEMO board is designed with the 24-pin SSOP packaged Si4844-B 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 Si4844-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 shows the physical layout of the board with key components indicated.
Figure 1. Si4844-DEMO Board Top Side in Time Mode
2
Rev. 0.1
Si4844-B-DEMO
Figure 2. Si4844-DEMO Board Bottom Side
Rev. 0.1
3
Si4844-B-DEMO
Power:
BAT1: 2 cells AAA battery holder
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 selector
1-2: SMA for AM Conductive Test (J6)
2-3: AM Ferrite Antenna
1
2
3
J1: BNC connector for FM/ SW conductive test or FM whip antenna
S12: FM antenna selector
1
2
1-2: FM HP ANT (J5)
2-3: FM BNC (J1)
3
Radio Band Selection:
The demo board provides two methods for selecting 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
2-3: Use slide switch to select band
1-2: Use push button to select band
1
4
Rev. 0.1
Si4844-B-DEMO
Radio Band Property Setting
S13:
1
2-3: Use the keypad to set the band property via MCU
2
1-2: Use the tuner default band setting values
3
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
Lout
2
Rout
3
GND
Tuner Output Test Point:
For the tuner specification test, TP1 is the recommended tuner output test point. The audio test instrument should
be connected to TP1 to get accurate test results.
1
2
3
Rout
Lout
GND
TP1:
Main Components:
U1: Silicon Laboratories Si4844-B FM/AM/SW ATDD receiver
U2: Audio amplifier
U3: MCU
LCD: The digital display for tuning information
Rev. 0.1
5
Si4844-B-DEMO
Control Interface:
VR1: Frequency tuning wheel
VR2: Volume control wheel
S3~S10: The keypad for human interface
S2: Band switch for FM, AM, and SW
1
2
3
4
5
6
7
8
9
10
11
12
Band definition for the slide switch is as follows:
1: FM1 (W 64–108 MHz) (N 87–108 MHz), ST indication = 6 dB [email protected] dBµV
2: FM5 (W 76–108 MHz) (N 64–87 MHz), 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 (W 3.2–7.6 MHz) (N 5.6– 6.4 MHz)
6: SW3 (W 3.2–10.0 MHz) (N 6.8–7.6 MHz)
7: SW5 (W 5.9–18.0 MHz) (N 9.2–10.0 MHz)
8: SW7 (W 7.0–16.0 MHz) (N 11.45–12.25 MHz)
9: SW9 (W 7.0–23.0 MHz) (N 13.4–14.2 MHz)
10: SW11 (W 9.0–22.0 MHz) (N 15–15.9 MHz)
11: SW13 (W 9.5–18.0 MHz) (N 17.1–18 MHz)
12: SW15 (W 10.0–22.0 MHz) (N 21.2–22 MHz)
Note: N = Narrow-band, W = Wideband
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
W/N BAND
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.
Radio Mode: Tuner IC works in powerup 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
FM/AM/SW
The FM/AM/SW radio parameters that can be configured are listed below in Table 2.
6
Rev. 0.1
Si4844-B-DEMO
Table 1. Key Function Description
Button/Mode
Time Mode
Tuner Off
POWER/BAND
FM/AM/SW Radio Mode
Tuner On
Hold Time
< 1s
None
Change between FM, AM, and SW (there
are 2 FM bands, 2 AM bands, and 8 SW
bands)
Hold Time
> 1s
Enable radio
Disable radio function and enter Time mode.
(Radio parameters will be saved to MCU)
None
FM mode: Change De-emphasis, between
50 µs and 75 µs.
DE/SPC
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.
UP/VOL+
Hold Time
< 1s
Hold Time
> 1s
DOWN/VOL–
Hold Time
< 1s
Hold Time
> 1s
MONO/ST
W/N BAND
Hold Time
< 1s
Hold Time
> 1s
SETTING
Hold Time
< 1s
Hold Time
> 1s
Increase Bass/Treble level by 1 step.
In setting menu, change the
In radio setting menu, change the current
current time/alarm parameter by parameter by one unit per each press.
In radio working mode, increase volume 1
one unit per each press.
step per each press.
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 at maximum.
In setting menu, change the
In radio setting menu, change the current
current time/alarm parameter by parameter by one unit per each press.
one unit per each press.
In radio working mode, decrease volume 1
step per each press.
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 at minimum.
None
FM/SW mode: Change band range between
wideband and narrow-band.
None
FM mode: Change between forced mono
audio and ST audio
None
In radio setting menu, change the current
item by one step per each press
None
Quickly return to FM working mode.
Rev. 0.1
7
Si4844-B-DEMO
Table 2. Radio Configuration Parameters
FM Parameter
AM Parameter
SW Parameter
Bass/Treble: 0-8
Bass/Treble: 1-7
Bass/Treble: 1-7
Default: 4
Default: 3
Default: 3
Digital volume: 0-63
Digital volume: 0-63
Digital volume: 0-63
Default: 63
Default: 63
Default: 63
Band top: max 109 MHz
Band top: max 1750 kHz
Band top: max 28.5 MHz
Default: 108/108 MHz for
wide band FM1/FM2
Default: 1710 kHz
Default: 7.6/10.0/18.0/16.0/23.0/22.0/18.0/
22.0 MHz for wide band SW1 to SW8 respectively.
Band bottom: min 64 MHz
Band bottom: min 504 kHz
Band bottom: min 2.3 MHz
Default: 87.5 MHz for narrow- Default: 522 kHz
band and 64 MHz for wideband.
Default: 3.2/3.2/5.9/7.0/7.0/9.0/9.5/10.0 MHz for
wideband SW1 to SW8 respectively.
De-emphasis: 50 or 75 µs
Channel space: 9 or 10 kHz
Default: 75 µs
Default: 9 kHz
TONE/VOL mode: a-d
Default: d
Tuning preference: a-d
Tuning preference: a-d
Default: a
Default: a
Notes:
TONE/VOL mode has four modes:
1. Bass/treble mode: no digital volume control, fixed volume level at 59.
2. Digital volume mode: no bass/treble effect, volume levels from 0 to 63.
3. Mixed mode 1: bass/treble & digital volume coexist, volume levels from 0 to 63, scale to 0 ~59.
4. Mixed mode 2: bass/treble & digital volume coexist, volume levels from 0 to 63.
The Tuning preference of FM mode has four selections:
1. preference1: When tuning to adjacent channels, allow stereo separation and stereo indicator is on, the volume level
decreases by2 dB.
2. preference2: When tuning to adjacent channels, allow stereo separation and stereo indicator is on, the volume level
remains unchanged.
3. preference3: When tuning to adjacent channels, disable stereo separation and stereo indicator is off, the volume level
decreases by 2 dB.
4. preference4: When tuning to adjacent channels, disable stereo separation and stereo indicator is off, the volume level
remains unchanged.
The Tuning preference of SW mode has two selections:
1. preference1: When tuning to adjacent channels, the volume level decreases by 2 dB.
2. preference2: When tuning to adjacent channels, the volume level remains unchanged.
There is no tuning preference selection for AM mode.
8
Rev. 0.1
Si4844-B-DEMO
4. Operation
The S4844-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 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 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 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.
Rev. 0.1
9
Si4844-B-DEMO
4.2. FM/AM/SW Radio Mode
In Time mode, after a long press (hold time > 1s) of 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, 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 for selecting 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 for setting the band property. One is to use the tuner default values.
The other method 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 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 via MCU.
3. Hold the POWER/BAND 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.
Note: 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.
10
Rev. 0.1
Si4844-B-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
bottom
De-emphasis (only for FM)
Channel space (only for AM)
The setting menu is illustrated in Figure 4.
Band
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 step 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 50 µs or 75 µs.
6. In AM working mode, press the DE/SPC button to set the Channel Space 9 kHz or 10 kHz.
SETTING MENU:
1 Band Top
2 Band Bottom
3 TONE/VOL MODE
a Bass/Treble MODE
4 Tuning preference
b Dig-Vol MODE
c MIX MODE1
d MIX MODE2
a preference1
b preference2
c preference3
d preference4
Figure 4. Setting Menu
Rev. 0.1
11
Si4844-B-DEMO
4.2.2. MCU Setting Radio Working Mode
The host MCU can set the radio working mode.
The working modes include:
Tone/volume
mode (only for FM), item 3 in setting menu
Tuning preference (only for FM and SW), item 4 in setting menu
Forced mono audio/ST audio (only for FM)
Follow these procedures to set radio working mode:
1. Press the SETTING button to enter item 3. The LCD displays the item number st3 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 the item 4.
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.
12
Rev. 0.1
Si4844-B-DEMO
5. Bill of Materials
ATDD
AM/FM/SW receiver IC Si4844-B with external 32.768 kHz crystal oscillator support
LM4910MA audio amplifier IC
TM8723 MCU
See Table 3 for details
Table 3. Si4844-DEMO Board Bill of Materials REV 1.4
Item
Qty
Reference
Description
Value
1
12
C1-2 C6 C19 C24 C37-42 C44
CAP,SM,0603,X7R
0.1 µ
2
2
C5 C36
CAP,SM,0603,X7R
0.47 µ
3
2
C8 C10
CAP,SM,0603,COG
100p
4
1
C33
CAP,SM,0603,COG
10p
5
4
C28-29 C32 C35
CAP,SM,0603,COG
22p
6
2
C11 C20
CAP,SM,0603,COG
150p
7
2
C30-31
CAP,SM,0603,X7R
33n
8
1
C34
CAP,SM,0603,COG
33p
9
1
C15
CAP,SM,0603,X7R
4.7 µ
10
4
C4 C7 C12 C21
CAP,SM,0603,X7R
10.0 µ
11
1
C13
CAP,SM,1210,X7R
47 µ
12
2
C18 C22
CAP,SM,0603,COG
330p
13
3
C23 C26 C27
CAP,SM,1210,X7R
220 µ
14
2
C14 C25
Electrolytic capacitor
100 µ/4 V
15
1
C3
Electrolytic capacitor
220 µ/4 V
16
1
R34
RES,SM,0603
100k
17
1
R27
RES,SM,0603
100R
18
2
R5 R6
RES,SM,0603
2k
19
1
R32
RES,SM,0603
10R
20
2
R3 R42
RES,SM,0603
10k
21
1
R41
RES,SM,0603
120k
22
2
R17 R22
RES,SM,0603
12k
23
2
R1-2
RES,SM,0603
1M
24
2
R4 R31
RES,SM,0603
1k
25
1
R24
RES,SM,0603
200R
26
1
R13
RES,SM,0603
22R
27
2
R16 R18
RES,SM,0603
2.2k
28
1
R46
RES,SM,0603
4.7M
29
2
R19 R20
RES,SM,0603
6.8k
30
1
R21
RES,SM,0603
NP
31
1
R7
RES,SM,0603,Tolerance ±1%
10k 1%
Rev. 0.1
13
Si4844-B-DEMO
Table 3. Si4844-DEMO Board Bill of Materials REV 1.4 (Continued)
Item
Qty
32
14
Reference
Description
Value
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
SI4844-B SOIC16
Si4844-B
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
2.5 k/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
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
270 nH
54
2
L3 L4
IND,SM,0603
120 nH
55
2
TP1 TP3
CONN,TH,1x3,HDR
CONN,TH,1x3,HDR
56
1
LCD1
LCD
LCD
57
1
J1
BNC VERTICAL
BNC for FM testing
58
1
J6
SMA VERTICAL
SMA for AM testing
59
1
ANT1
AW ferrite stick antenna
220 µH
60
1
BAT1
BATTERY BOX ,AAA*2 SIZE
61
4
S11 S12 S13 S14
One pole two throw switch
62
1
S2
Single pole twelve throw switch
63
9
S1 S3-10
Push button
64
1
VR1
100k,±10%,Variable resistor(POT)
100k
65
1
VR2
10k,±20%,Variable resistor(POT)
10k
Rev. 0.1
Rev. 0.1
2.5k/100M
B6
LNA_EN
[1]
R34
100k
33n
C30
R41
120k
C31
33n
R32
10R
Q1
2SC9018
10p
R31
1k
C33
S11
D2
BAV99
C5
3
2
RESET [2]
0.47u
1
12
10k
R3
C19
0.1u
S12
L2
11
2k
R6
C34
33p
270nH
[1] FMI
9
C36
0.47u
J6
10
AMI
GND
13
NC
GND
14
8
C13
47u
C1
100R
R27
0.1u
VR1
100k 10%
FMI
RFGND
6
SDIO
17
SCLK [2]
NC
[1] BAND
5
SCLK
16
SDIO [2]
RST
15
7
18
NC
4
NC
XTALO
C28
22p
32.768KHz
Y1
R46
4.7M
19
XTALI
3
BAND
VDD1
20
C6
C15
C29
22p
R21
NC
0.1u 4.7u
1
LNA_EN
L1
0R/120nH
2
U1
1
3
Si4844
S13
[2]
IRQ
TP1
C4
10u
C7
10u
VCC
C39
0.1u
VCC
L4
120nH
L3
120nH
GND
Lout
Rout
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
330p
C22
330p
C18
12k
R17
12k
R22
R5
2k
4
3
2
1
U2
C11
LM4910MA
GND
SHUTDOWN
IN2
IN1
R20
C20
6k8
R19
150p
C25
100u/6.3V
VDD
VO3
VO2
VO1
150p
6k8
5
6
7
8
C24
0.1u
C27
220u
C26
220u
C23
220u
C8
100p
C9
100p
C10
100p
3
2
1
TP3
B4 2k5/100M
B7 2k5/100M
B5 2k5/100M
Rout
GND
Lout
Figure 5. Si4844-DEMO Board Schematic REV1.4
3
2
1
[1] LNA_EN
10k
R42
[2] XTALI
[1] TUNE1
VCC
2
TUNE2
VDD2
21
IRQ
TUNE1
DBYP
22
ROUT
23
LOUT
24
Test point
VCC
VCC
VR2-A
VR2-B
MW
Test point
ANT1
MW ferrite antenna
[2]
SHUTDOWN
VCC
J1
B1
D4
BAV99
1
2
3
NC
FM/SW
[1] FMI
Audio output
J5
BAND [1]
2-1 push button
2-3 slide switch
S14
2
S14: Band Selection
3
1
VCC
1
S2
2
3
4
5
6
7
8
9
10
11
12
13
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 (W 64MHz - 108MHz ) (N 87MHz - 108MHz)
FM5 (W 76MHz - 108MHz) (N 64MHz - 87MHz)
AM1 (520kHz - 1710kHz)
AM2 (522kHz - 1620kHz)
SW1 (W 3.2MHz - 7.6MHz) (N 5.6MHz - 6.4MHz)
SW3 (W 3.2MHz - 10.0MHz) (N 6.8MHz - 7.6MHz)
SW5 (W 5.9MHz - 18.0MHz) (N 9.2MHz - 10.0MHz)
SW7 (W 7.0MHz - 16.0MHz) (N 11.45MHz - 12.25MHz)
SW9 (W 7.0MHz - 23.0MHz) (N 13.4MHz - 14.2MHz)
SW11 (W 9.0MHz - 22.0MHz) (N 15MHz - 15.9MHz)
SW13 (W 9.5MHz - 18.0MHz) (N 17.1MHz - 18MHz)
SW15 (W 10.0MHz - 22.0MHz) (N 21.2MHz - 22MHz)
(Note: W= Wide Band, N=Narrow Band)
(Note: Wide band only valid under MCU setting mode)
TUNE1 [1]
Si4844-B-DEMO
6. Schematics
15
Rev. 0.1
[2]
[2]
[2]
[2]
[2]
[2]
KEY_C0
KEY_C1
KEY_C2
KEY_C3
KEY_R0
KEY_R1
XTALI [1]
Y2
32.768KHz
C42
0.1u
RESET
VCC
C40
0.1u
LCD_C1 [2]
LCD_C2 [2]
C37
0.1u
VCC
C35
22p
C32
22p
VCC
S1
R1
1M
11
10
9
8
7
6
5
4
3
2
1
SETTING
S10
W=Wide, N=Narrow
KEY
TREBLE/AL
S6
BASS/TMR
S5
DE/SPC
MONO/ST
W/N Band
S9
DOWN/VOL-
POWER/BAND
S3
[2] KEY_C1
[2] KEY_C2
MCU
S4
COM2
COM1
CUP2
CUP1
VDD3
VDD2
VDD1
GND
XOUT
XIN
BAK
U3
IRQ [1]
Q3
2N3906
S8
UP/VOL+
S7
C38
0.1u
C44
0.1u
R2
1M
44
TEST
43
INT
COM4
13
COM3
12
[2]
LCD_C3
42
RESET
COM5
14
[2] KEY_C3
15
[2] KEY_C0
38
SEG33/IOC2/KI2
41
SEG35/IOC4/KI4
SEG1(K1)
39
SEG32/IOC1/KI1
SEG4(K4)
SEG3(K3)
40
SEG34/IOC3/KI3
SEG2(K2)
16
[2]
[2]
18
[2]
LCD_S1
17
[2]
LCD_S0
KEY_R1
KEY_R0
[2] BZ
36
SEG30/IOB3/BZB
SEG6(K6)
[1] SHUTDOWN
35
SEG29/IOB2/ELP
SEG7(K7)
R24
23
24
25
26
27
28
29
30
31
32
VCC
[1]
SCLK
LCD_S6
LCD_S7
LCD_S8
LCD_S9
LCD_S10
LCD_S11
LCD_S12
SDIO
RESET
a preference1
b preference2
c preference3
d preference4
a Bass/Treble MODE
b Dig-Vol MODE
c MIX MODE1
d MIX MODE2
[2]
[2]
[2]
[2]
[2]
[2]
[2]
[1]
[1]
BZ
[2]
C2
0.1u
1k
R4
C3
220u/4V
Q2
2N3904
BZ1
BUZZER
D6
1N4148
R13
22R
VCC
Figure 6. Si4844-DEMO Board Schematic REV1.4
1 Band Top
2 Band Bottom
3 Tone/Vol MODE
4 Tuning Preference
SETTING MENU:
SEG9(K9)
SEG10(K10)
SEG11(K11)
SEG12(K12)
SEG21
SEG22
SEG23
SEG24/IOA1
SEG25/IOA2
SEG26/IOA3
33
200R
SEG27/IOA4
D1
Tuning indicator
[2] LCD_S13
34
SEG28/IOB1/ELC
SEG8(K8)
37
SEG31/IOB4/BZ
SEG5(K5)
19
[2]
21
[2]
22
[2]
LCD_S5
20
[2]
LCD_S3
LCD_S2
[2] LCD_C1
1
COM1
[2] LCD_C2
[2] LCD_S1
FM
MW SW
2
COM2
[2] LCD_C3
3
COM3
[2] LCD_S0
4
SEG0
[2] LCD_S2
6
SEG2
5
SEG1
[2] LCD_S3
7
SEG3
[2] LCD_S4
8
SEG4
[2] LCD_S5
9
LCD
SEG5
[2] LCD_S6
10
SEG6
[2] LCD_S7
11
SEG7
[2] LCD_S8
[2] LCD_S10
SLEEP
12
SEG8
[2] LCD_S9
13
SEG9
[2] LCD_S11
15
[2] LCD_S12
MHz
KHz
MHz
PM
SEG11
14
SEG10
[2] LCD_S13
17
SEG13
16
SEG12
16
LCD_S4
C41
0.1u
LCD1
Si4844-B-DEMO
Figure 7. Si4844-DEMO Board Gerber REV1.4
Si4844-B-DEMO
Rev. 0.1
17
Smart.
Connected.
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Products
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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