SI4731-DEMO Datasheet, PDF (3/14 Pages) Silicon Laboratories – Si4731 DEMO BOARD USERS GUIDE

Power:
S14: 3 cell / 1 cell selection
S15: Power on / off
Audio connectors:
J14: Audio input (unused)
J15: Audio headphone output
Antenna selections:
J1: FM whip antenna connector
J2: FM SMA connector for FM conductive testing
J3: AM SMA connector for AM conductive testing
J4: AM air loop antenna wire connector
J5: JTAG connector
T1: Transformer for AM air loop operation (not shown)
JP1: FM antenna input selection
3
1-2: FM SMA (J2)
1-3: FM whip antenna (J1)
2
4
1-4: FM headphone (J15)
1
JP2: AM signal input selection
4
1-2: AM ferrite loop stick
3
1
1-3: AM air loop (J4)
1-4: AM SMA (J3)
2
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: Silicon Laboratories Si4731 AM/FM/RDS tuner
U2: Audio amplifier
U3: Silicon Laboratories C8051F930 MCU
U4: LDO
Control interface:
Reset Key: Reset button
KeyPad: 3x4 matrix buttons for human interface
Rev. 0.1
Si4731-DEMO
3