Wiring Diagram

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Picture 13-11
Forteen、FAQ
1、How to troubleshoot the SPI/I2C interface
a、First check whether the power supply of the chip is normal, whether the VDD33 foot has
voltage (3.3 V) input, and the RF VDD foot has 1.8V or so voltage output;
b、Check the vibration of the chip. The default is IDLE state after the power is reset on the chip,
and the crystal is switched on, and the power consumption is about 0.6 mA.XI and XO leg voltage
by the multimeter at this time should be around 0.9 V, with an oscilloscope probe on the XOUT feet
should be able to see 12 MHZ sine wave (if the oscilloscope probe capacitance is too large, low
impedance vibration may cause crystals，The probe is recommended to be hit on the X10 slot）；
c、When the program runs, check whether there is a signal on the digital interface；
d、If the above conditions are normal, the time order of the interface is fine, and you should be
able to read and write the register normally。