Skyworks Si4731-DEMO User Manual Download Page 12 | Manualshive

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Si4731-DEMO

12

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com

Rev. 0.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 4, 2021

7. Schematics

Figure

8.

S

i4731

-DEMO Board Sch

ematic

—

Radi

o and

Audio Portion

s

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Summary of Contents for Si4731-DEMO

Page 1: ...and limits De emphasis 50 or 75 µs AM channel spacing detection threshold Stereo mono indicator Volume control with mute function AM FM band and signal quality indicator display Battery voltage indicator Calendar display 3x4 matrix keypad interface Direct input of station frequencies 2 Overview The Skyworks Solutions Si4731 DEMO board provides a complete portable AM FM radio design with numerous e...

Page 2: ...1 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice October 4 2021 3 Description Figure 1 and Figure 2 shows the physical layout of the board with key components indicated Figure 1 Si4731 DEMO Board Top Side in Calendar Mode Figure 2 Si4731 DEMO Board Bottom Side U3 J5 ...

Page 3: ...wire connector J5 JTAG connector T1 Transformer for AM air loop operation not shown JP1 FM antenna input selection JP2 AM signal input selection JP3 AM antenna type selection Open AM ferrite loop stick antenna Short AM air loop antenna JP4 FM PCB antenna selection Short Embedded PCB trace as FM short antenna for Si4704 05 1x 2x Open No PCB short antenna Main components LCD 79x101 dot matrix LCD U1...

Page 4: ... SET 9 key is used to enter the setup menu The M 3 and M 7 keys are used to select different adjustable items hour minutes year day month The UP 4 and DOWN 8 keys are used to set the value for each selected item The Calendar Mode date and time can also be set automatically with RDS Current Time CT information from a broadcast radio station as described in the following section 4 2 AM FM Radio Mode...

Page 5: ...lternative frequency information is received the AF indicator will be displayed If the signal quality of the currently tuned station degrades the radio will automatically change to one of the alternative frequency stations 4 2 4 Tune Seek In Radio Mode pressing the UP 4 or DOWN 8 button for less than 0 5 s will tune the frequency by the preset step size Holding the button for longer than 0 5 s but...

Page 6: ...a channel frequency A frequency is considered valid if it lies within the band limits If a non valid frequency is entered the closest band limit will be entered and displayed 4 2 8 Volume The VOL 2 or VOL 6 keys are used to adjust the volume up or down The board audio output will be muted when volume is at the lowest setting 4 2 9 AM Channel Spacing Auto Set In AM Mode the MEM AL 1 key will automa...

Page 7: ...ode FM or AM Radio function is enabled LCD displays the radio station parameters The buttons are used for direct digit input of station frequencies The functions of the buttons are summarized in Table 1 Table 1 Key Function Description Button Mode Calendar Mode Tuner Off Radio AM FM Mode Tuner On MEM AL 1 None FM Mode Used to adjust calendar using received RDS CT AM Mode Used to automatically dete...

Page 8: ... None Increase or decrease volume 1 step 3 s Quickly increase or decrease volume FUNC DIGIT None Shift the keyboard between normal function and digital input mode Combination keying None A Radio IC version B Firmware version C Varactor reading D AGC status Table 2 Radio Configuration Parameters FM Parameter AM Parameter Spacing 50 100 200 kHz Default 100 kHz Spacing 1 9 10 kHz Default 9 kHz RSSI S...

Page 9: ...sable 32763 32773 Default 32768 RClock 0 AFC disable 32763 32773 Default 32768 Smute Rate 0 255 Default 64 Smute Rate 0 255 Default 64 Smute SNR 0 15 dB Default 4 dB Smute SNR 0 63 dB Default 10 dB Smute Attenuation 0 31 dB Default 16 dB Smute Attenuation 0 63 dB Default 16 dB Blend Mono 0 127 dBµV Default 30 dBµV Smute Slop 1 5 Default 2 Blend Stereo 0 127 dBuV Default 49dBuV Set Factory Default ...

Page 10: ...C15 C23 28 C41 CAP SM 0603 X7R 1 µF 4 6 C10 C14 C19 C37 C39 40 CAP SM 0603 X7R 0 1 µF 5 4 C2 C3 C21 22 CAP SM 0603 X7R 22 pF 6 2 C8 C12 CAP SM 0603 X7R 220 pF 7 2 C11 C18 CAP SM 0603 X7R 820 pF 8 3 C5 7 CAP SM 0603 X7R 100 pF 9 4 C17 C38 C44 C46 CAP SM 0603 X7R 1 nF 10 8 C32 36 C54 C55 C43 CAP SM 0603 X7R NP 11 3 C30 C45 C53 RES SM 0603 0R 12 1 C9 CAP SM 1210 tantalum 100 µF 6 3 V 13 1 C31 CAP SM ...

Page 11: ...RANS FORMER SLMWTF01 37 1 J5 CONN TH 2X10 HDR 38 1 J4 Wire holder 39 2 Y1 2 Crystal 32 768 kHz 40 2 J14 15 Stereo earphone jack 3 5 mm 41 2 JP3 4 CONN TH 1X2 HDR CONN TH 1X2 HDR 42 2 JP1 2 CONN TH 1X4 HDR CONN TH 1X4 HDR 43 4 J10 13 CONN TH 1X5 HDR CONN TH 1X5 HDR 44 1 J1 BNC_VERTICAL BNC for whip 45 2 J2 3 SMA_VERTICAL SMA for FM AM 46 1 S14 SLIDE SWITCH With 3 Double Pole Double Throw Switches i...

Page 12: ...Fax 781 376 3100 sales skyworksinc com www skyworksinc com Rev 0 1 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice October 4 2021 7 Schematics Figure 8 Si4731 DEMO Board Schematic Radio and Audio Portions ...

Page 13: ... 376 3000 Fax 781 376 3100 sales skyworksinc com www skyworksinc com 13 Rev 0 1 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice October 4 2021 Figure 9 Si4731 DEMO Board Schematic MCU Portion ...

Page 14: ...CLUDING WITHOUT LIMITATION LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE Skyworks products are not intended for use in medical lifesaving or life sustaining applications or other equipment in which the failure of the Skyworks products could lead to personal inju...

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