Silicon Laboratories Si4311-DB User Manual page 2

Si 43 11- DB
Power Supply Connector
J1: Jumper to select external 3.3 V supply. This is a solderable jumper and should be shorted when used.
J7: External 3.3 V supply connector: +3.3 V with the jumper on the right side and GND on the left side.
J3: 9 V battery supply connector: Power on with the jumper on the right side and power off with the jumper on the
left side.
J8: Jumper used to measure Si4311 current consumption.
 Jumper connected (shorted) is normal operation.
 Jumper connected with an ammeter in series to measure current.
D3: Power-on indicator. LED lights up when powered on.
RF Input
J4: SMA connector for an external RF input. Ensure inductor L3 is open to remove the PCB antenna when using
the SMA input.
Demodulated Data Output
J5: SMA connector for demodulated data output.
External Clock Driver
J9/J17: These solder jumpers should be shorted when an external clock driver is used.
J10: External clock connection point.
Automatic Frequency Centering (AFC)
J11: Jumper used to select AFC function.
 Logic High (left side connection) to enable AFC.
 Logic Low (right side connection) to disable AFC.
Carrier Frequency Selection
J12: Jumper used to select 315 or 433.92 MHz carrier frequency.
 Logic High (left side connection) for 315 MHz.
 Logic Low (right side connection) for 433.92 MHz.
2
Figure 2. Si4311 DEMO Board Bottom Side with 9 V Battery
Rev. 0.3