User Manual

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74 JN-DS-JN5139 v1.5 © Jennic 2008
B.2 16MHz Oscillator
The JN5139 contains the necessary on-chip components to build a 16 MHz reference oscillator with the addition of
an external crystal resonator and two tuning capacitors. The schematic of these components are shown in Figure 49.
The two capacitors, C1 and C2, should be 15pF ±5% and use a COG dielectric. For a detailed specification of the
crystal required see Appendix B.1.
XTALOUT
C2
C1
R1
XTALIN
JN5139
Figure 49: Crystal oscillator connections
The clock generated by this oscillator provides the reference for most of the JN5139 subsystems, including the
transceiver, processor, memory and digital and analogue peripherals.