
74 JN-DS-JN5148-001 1v9 © NXP Laboratories UK 2013
22.3.12 32kHz Crystal Oscillator
VDD = 2.0 to 3.6V, -40 to +85ºC
Parameter Min Typ Max Unit Notes
Current consumption of cell
and counter logic
This is sensitive to the ESR
of the crystal,Vdd and total
capacitance at each pin
Start – up time 0.8 s Assuming xtal with ESR of
less than 40kohms and
CL= 9pF External caps =
15pF
(Vdd/2mV pk-pk) see
Appendix B
External Capacitors
(CL=9pF)
15 pF Total external capacitance
needs to be 2*CL, allowing
for stray capacitance from
22.3.13 32MHz Crystal Oscillator
VDD = 2.0 to 3.6V, -40 to +85ºC
Parameter Min Typ Max Unit Notes
Start – up time 0.84 ms Assuming xtal with ESR of
less than 40ohms and CL=
9pF External caps = 15pF
see Appendix B
Input capacitance 1.4 pF Bondpad and package
DC voltages, XTALIN /
XTALOUT
External Capacitors
(CL=9pF)
15 pF Total external capacitance
needs to be 2*CL, allowing
for stray capacitance from
Amplitude detect threshold 320 mVp-p Threshold detection
accessible via API
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