Silicon Labs Si4844-B-Demo Board User guide

Brand: Silicon Labs

Model: Si4844-B-Demo Board

Type: User guide

Silicon Labs Si4844-B-Demo Board is an ATDD (analog tune and digital display) FM/AM/SW radio that integrates everything from antenna input to audio output. It supports a wide range of FM/SW bands, and allows selection of different bands using a slide switch or push button. The board operates with two AAA batteries and has a working voltage down to 2.0 V. It features a 2x4 matrix keypad, a built-in speaker, and an LCD display that shows tuning information. Additionally, it has bass/treble controls and the ability to set alarm and time functions.

Si4844-B-DEMO

Si4844-B 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 kHz 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 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.

Si4844-B-DEMO

2 Rev. 0.1

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

Si4844-B-DEMO

Rev. 0.1 3

Figure 2. Si4844-DEMO Board Bottom Side

Si4844-B-DEMO

4 Rev. 0.1

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

J1: BNC connector for FM/ SW conductive test 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; the other is

to use the POWER/BAND push button. S14 determines which method is in use.

S14:

1-2: SMA for AM Conductive Test (J6)

2-3: AM Ferrite Antenna

1-2: FM HP ANT (J5)

2-3: FM BNC (J1)

2-3: Use slide switch to select band

1-2: Use push button to select band

Si4844-B-DEMO

Rev. 0.1 5

Radio Band Property Setting

S13:

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:

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.

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

2-3: Use the keypad to set the band property via MCU

1-2: Use the tuner default band setting values

Lout

Rout

GND

Lout

Rout

GND

Si4844-B-DEMO

6 Rev. 0.1

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

Band definition for the slide switch is as follows:

1: FM1 (W 64–108 MHz) (N 87–108 MHz), ST indication = 6 dB separation@20 dBµV

2: FM5 (W 76–108 MHz) (N 64–87 MHz), 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 (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.

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 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

The FM/AM/SW radio parameters that can be configured are listed below in Table 2.

1 456

789

10 12

TREBLE/AL BASS/TMR

DE/SPC POWER/BAND

SETTING

MONO/ST

W/N BAND

DOWN/VOL- UP/VOL+

Si4844-B-DEMO

Rev. 0.1 7

Table 1. Key Function Description

Button/Mode Time Mode FM/AM/SW Radio Mode

Tuner Off Tuner On

POWER/BAND 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)

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 at 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 at minimum.

MONO/ST

W/N BAND

Hold Time

<1s

None FM/SW mode: Change band range between

wideband and narrow-band.

Hold Time

>1s

None FM mode: Change between forced mono

audio and ST audio

SETTING Hold Time

<1s

None In radio setting menu, change the current

item by one step per each press

Hold Time

>1s

None Quickly return to FM working mode.

Si4844-B-DEMO

8 Rev. 0.1

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 respec-

tively.

Band bottom: min 64 MHz Band bottom: min 504 kHz Band bottom: min 2.3 MHz

Default: 87.5 MHz for narrow-

band and 64 MHz for wide-

band.

Default: 522 kHz 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.

Si4844-B-DEMO

Rev. 0.1 9

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.

Si4844-B-DEMO

10 Rev. 0.1

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.

Si4844-B-DEMO

Rev. 0.1 11

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

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 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.

Figure 4. Setting Menu

SETTING MENU:

1 Band Top

2 Band Bottom

3 TONE/VOL MODE

4 Tuning preference

a preference1

b preference2

a Bass/Treble MODE

b Dig-Vol MODE

c MIX MODE1

d MIX MODE2

c preference3

d preference4

Si4844-B-DEMO

12 Rev. 0.1

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.

Si4844-B-DEMO

Rev. 0.1 13

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%

Si4844-B-DEMO

14 Rev. 0.1

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 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

Table 3. Si4844-DEMO Board Bill of Materials REV 1.4 (Continued)

Item Qty Reference Description Value

Si4844-B-DEMO

Rev. 0.1 15

6. Schematics

FM/SW

Si4844

Audio output

S13: Band property

2-3 Tuner default

2-1 MCU Setting

S14: Band Selection

2-3 slide switch

2-1 push button

Test point

Lout

Rout

GND

Test point

Lout

Rout

GND

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)

C39

0.1u

BAT 1

AAA*2

R15

20k 1%

R10

20k 1%

R12

20k 1%

R11

20k 1%

R14

20k 1%

10k 1%

40k 1%

R28

20k 1%

R29

160k 1%

270nH

C19

0.1u

C15

4.7u

VR1

100k 10%

0.1u

BAV 99

0.47u

2SC9018

R31

R32

10R

C30

33n

C33

10p

R41

120k

C31

33n

2.5k/100M

C36

0.47u

ANT1

MW ferrite antenna

BAV 99

R34

100k

C34

33p

LNA_EN

IRQ

TUNE1

TUNE2

BAN D

FMI

RFGND

AMI

GND

RST

SDIO

SCLK

XTA LO

XTA LI

VDD1

VDD2

DBYP

ROUT

LOUT

0.1u

R27

100R

R33

20k 1%

R35

20k 1%

R36

33k 1%

C13

47u

R43

30k 1%

R44

47k 1%

C14

100u/4V

0R/120nH

10u

C12

10u

C21

10u

VR2-A

VR2-B

C24

0.1u

R20

6k8

R22

12k

2k5/100M

IN1

IN2

SHUTDOWN

GND

VDD

VO3

VO2

VO1

LM4910MA

C10

100p

C11 150p

R16

2k2

C18

330p

C20 150p

R17

12k

R18

2k2

C22

330p

R19

6k8

C23

220u

C26

220u

C27

220u

100p

C25

100u/6.3V

32.768KHz

C28

22p

C29

22p

R46

4.7M

10k

R21

R42

10k

S11

S13

S14

120nH

S12

TP3

TP1

VCC

BAN D

[1]

LNA_EN[1]

LNA_EN

[1]

BAN D

[1]

TUNE1

[1]

TUNE1

[1]

RESET

[2]

VCC

FMI

[1]

IRQ[2]

SCLK [2]

SDIO [2]

VCC

XTA LI

[2]

FMI

[1]

VCC

SHUTDOWN [2]

VCC

Figure 5. Si4844-DEMO Board Schematic REV1.4

Si4844-B-DEMO

16 Rev. 0.1

MCU

LCD

KEY

BUZZER

1 Band Top

2 Band Bottom

3 Tone/Vol MODE

d MIX MODE2

c MIX MODE1

b Dig-Vol MODE

a Bass/Treble MODE

SETTING MENU:

d preference4

c preference3

b preference2

a preference1

4 Tuning Preference

W/N Band

W=Wi de, N= Narr ow

BAS S/TMR

POWER/BAND

DE/SPC

TREBLE/AL

MONO/S T

UP/VOL+

DOWN/VOL-

S10

SETTING

BZ1

2N3904

1N4148

0.1u

220u/4V

R13

22R

MHz

KHz

SLEEP

MW SW

MHz

1MOC

2MOC

3MOC

0GES

1GES

2GES

3GES

4GES

5GES

6GES

7GES

8GES

9GES

01GES

11GES

21GES

31GES

LCD1

BAK

XIN

XOUT

GND

VDD1

VDD2

VDD3

CUP1

CUP2

COM1

COM2

3MOC

4MOC

5MOC

)

1K(1

)2K(2GES

)3K(3GES

)

4K(4

)5K(5GES

)

6K(6

)7K(7GES

)8K(8GES

SEG9(K9)

SEG10(K10)

SEG11(K11)

SEG12(K12)

SEG21

SEG22

SEG23

SEG24/IOA1

SEG25/IOA2

SEG26/IOA3

SEG27/IOA4

CLE/1BOI/82GES

PLE/2BOI/92GES

ZB/3BOI/03GES

ZB/4BOI/13GES

1IK/1COI/23GES

2IK/2COI/33GES

3IK/

3COI/43GES

K/4

COI/53GES

TESER

TNI

TSET

32.768KHz

C32

22p

C35

22p

C37

0.1u

C38

0.1u

C40

0.1u

2N3906

C41

0.1u

RESET

C42

0.1u

C44

0.1u

Tuning indicator

R24

200

KEY_R1

[2]

KEY_C3

[2]

KEY_C1

[2]

KEY_C0

[2]

KEY_C2

[2]

KEY_R0

[2]

VCC

1C_DCL

]2[

2C_DCL

]2[

3C_DCL

]2[

0S_DCL

]2[

1S_DCL

]2[

2S_DCL

]2[

3S_DCL

]2[

4S_DCL]2[

5S_DCL

]2[

6S_DCL

]2[

7S_DCL

]2[

_DCL]2[

9S_DCL

]2[

01S_DCL

]2[

11S_DCL

]2[

21S_DCL

]2[

31S_DCL

]2[

LCD_C1

[2]

LCD_C2

[2]

3C_DCL

]2[

0R_YEK

]2[

1R_

]2[

0S_DCL

]2[

1S_DC

]2[

2S_DCL

]2[

3S_DC

]2[

4S_DCL

]2[

5S_DCL

]2[

LCD_S6

[2]

LCD_S7

[2]

LCD_S8

[2]

LCD_S9

[2]

LCD_S10

[2]

LCD_S11

[2]

LCD_S12

[2]

SDIO

[1]

RESET

[1]

SCLK

[1]

31S_DCL

]2[

0C_YEK]2[

1C_YEK]2[

2C_YEK]2[

3C_YEK]2[

IRQ

[1]

VCC

XTA LI

[1]

CCV

NWODTUHS]1[

Figure 6. Si4844-DEMO Board Schematic REV1.4

Si4844-B-DEMO

Rev. 0.1 17

Figure 7. Si4844-DEMO Board Gerber REV1.4

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

or express copyright licenses granted hereunder to design or fabricate any integrated circuits. The products must not be used within any Life Support System without the specific

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