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23.7
Subclock Oscillator
(1) Connecting 32.768kHz Quartz Oscillator
To supply a clock to the subclock oscillator, connect a 32.768kHz quartz oscillator, as shown in
Figure 23-8. See Section 23.3.1, Notes on Board Design for notes on connecting crystal
oscillators.
Figure 23-8 Example Connection of 32.768kHz Crystal Oscillator
Figure 23-9 shows the equivalence circuit for a 32.768kHz oscillator.
OSC1
Figure 23-9 Equivalence Circuit for 32.768kHz Oscillator
850
OSC1
OSC2
L
C
s
s
C
1
C
2
R
C
o
C
=C
=15pF (typ)
1
2
s
OSC2
C
=1.5pF (typ.)
o
R
=14kΩ (typ.)
s
f
=32.768kHz
w
Type No.: MX38T (Nihon Dempa Kogyo)
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