SI4735-D60 and external reference clock test.

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Using external RCLK (crystal oscillator disabled setup). The PU2CLR SI4735 Arduino Library has support for external reference clock. See


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It is DSP receiver based on SI4735-D60 device made by Silicon Labs. The SI4735-D60 and SI4732-A10 devices can be used to listen to AM and SSB from 150 to 30000 kHZ and FM from 64 to 108 MHz.

// Sets the reference clock (REFCLK). A value between 31130 and 34406
si4735.setRefClock(clock_value);
// Sets the number used by the prescaler to divide the external RCLK down to the internal REFCLK
si4735.setRefClockPrescaler(prescaler);
// Startup the device with external clock setup. Where XOSCEN_RCLK set the system to use the external clock
si4735.setup(RESET_PIN, -1, POWER_UP_FM, SI473X_ANALOG_AUDIO, XOSCEN_RCLK);
See Si47XX PROGRAMMING GUIDE; AN332 (REV 1.0) pages 34 and 35.


#si4732 #si4735 #arduino #si4730 #shortwave #ssb #receiver #radio