Data Sheet

© NXP Laboratories UK 2012 JN-DS-JN5142 1v0 67
19.3.9 32kHz Crystal Oscillator
VDD = 2.0 to 3.6V, -40 to +125ºC, italic +85 ºC Bold +125 ºC
Parameter
Min
Typ
Max
Unit
Notes
Current consumption of cell
and counter logic
1.5
1.75, 2.0
µA
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
Input capacitance
1.4
pF
Bondpad and package
Transconductance
17
µA/V
External Capacitors
(CL=9pF)
15
pF
Total external capacitance
needs to be 2*CL, allowing
for stray capacitance from
chip, package and PCB
Amplitude at Xout
Vdd-0.2
Vp-p
19.3.10 32MHz Crystal Oscillator
VDD = 2.0 to 3.6V, -40 to +125ºC, italic +85 ºC Bold +125 ºC
Parameter
Min
Typ
Max
Unit
Notes
Current consumption
300
375
450, 500
µA
Excluding bandgap ref.
Start – up time
0.74
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
Transconductance
3.65, 3.55
4.30
5.16
mA/V
DC voltages,
XTALIN/XTALOUT
390/425
375/405
425/465
470/520
mV
External Capacitors
(CL=9pF)
15
pF
Total external
capacitance needs to
be 2*CL, allowing for
stray capacitance from
chip, package and
PCB
Amplitude detect threshold
320
mVp-p
Threshold detection
accessible via API