Silicon Laboratories Si4844-B Series User Manual Download Page 12

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S i 4 8 4 4 - B - D E M O

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.

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Summary of Contents for Si4844-B Series

Page 1: ... 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 ban...

Page 2: ...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 sh...

Page 3: ...Si4844 B DEMO Rev 0 1 3 Figure 2 Si4844 DEMO Board Bottom Side Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com ...

Page 4: ...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 3 2 1 1 2 FM HP ANT J5 2 3 FM BNC J1 3 2 1 2 3 Use slide switch to select band 1 2 Use push button to select band 1 2...

Page 5: ...int 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 3 2 1 2 3 Use the keypad to set the band property via MCU 1 2 Use the tuner default b...

Page 6: ...Hz 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 di...

Page 7: ...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 pe...

Page 8: ... 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 adja...

Page 9: ... 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 ...

Page 10: ...e 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 s...

Page 11: ... 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...

Page 12: ...ress 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 Downloaded from Arrow com Down...

Page 13: ...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 R...

Page 14: ...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 butt...

Page 15: ...E1 4 TUNE2 5 BAND 6 NC 7 NC 8 FMI 9 RFGND 10 NC 11 NC 12 AMI 13 GND 14 GND 15 RST 16 SDIO 17 SCLK 18 XTALO 19 XTALI 20 VDD1 21 VDD2 22 DBYP 23 ROUT 24 LOUT U1 C1 0 1u R27 100R R33 20k 1 R35 20k 1 R36 33k 1 C13 47u R43 30k 1 R44 47k 1 C14 100u 4V L1 0R 120nH C4 10u C7 10u C12 10u C21 10u VR2 A VR2 B 1 2 3 J5 C24 0 1u R20 6k8 R22 12k B4 2k5 100M B5 2k5 100M B7 2k5 100M 1 IN1 2 IN2 3 SHUTDOWN 4 GND 5...

Page 16: ...S 93 2IK 2COI 33GES 04 3IK 3COI 43GES 14 4IK 4COI 53GES 24 TESER 34 TNI 44 TSET U3 Y2 32 768KHz C32 22p C35 22p C37 0 1u C38 0 1u C40 0 1u Q3 2N3906 R1 1M R2 1M C41 0 1u S1 RESET C42 0 1u C44 0 1u D1 Tuning indicator R24 200R KEY_R1 2 KEY_C3 2 KEY_C1 2 KEY_C0 2 KEY_C2 2 KEY_R0 2 BZ 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 8S_DCL 2 9S_...

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Page 18: ...d for military applications Silicon Laboratories products shall under no circumstances be used in weapons of mass destruction including but not limited to nuclear biological or chemical weapons or missiles capable of delivering such weapons Trademark Information Silicon Laboratories Inc Silicon Laboratories Silicon Labs SiLabs and the Silicon Labs logo CMEMS EFM EFM32 EFR Energy Micro Energy Micro...

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