Functional description
FRDM-
KW36 Minimum BoM Development Board User’s Guide, User’s Guide, Rev. 0, 09/20187
10
NXP Semiconductos.
•
32 MHz Reference Oscillator
o
Figure 10 shows the 32 MHz external crystal Y3. The KW36Z requires the frequency to
be accurate less than
10 ppm. For more details, please refer to the device datasheet.
o
Internal load capacitors provide the crystal load capacitance. The internal load capacitor
is adjustable which allows the center frequency of the crystal to be tuned.
o
To measure the 32 MHz oscillator frequency, program the CLKOUT (PTB0) signal to
provide buffered output clock signal (TP29).
Figure 11. KW36 Minimum BoM Board 32.786 kHz oscillator circuit
•
32.768 kHz Crystal Oscillator (for accurate low-power time base)
o
A secondary 32.768 kHz crystal QZ1 is provided (see Figure 6)
o
Internal load capacitors provide the entire crystal load capacitance
3.5 Power management
There are two different ways to power the KW36 Minimum BoM board. The KW36 Minimum BoM
board power-management circuit is shown in Figure 12:
