Datasheet

Section 23 Clock Pulse Generator
Rev. 6.00 Mar. 18, 2010 Page 780 of 982
REJ09B0054-0600
23.7 Subclock Oscillator
23.7.1 Connecting 32.768-kHz Crystal Resonator
To supply a clock to the subclock divider, connect a 32.768-kHz crystal resonator, as shown in
figure 23.8. Figure 23.9 shows the equivalence circuit for a 32.768-kHz oscillator.
OSC1
OSC2
C
1
C 2
C 1 = C 2 = 15 pF (typ)
Note: CL1 and CL2 are reference values including the floating
capacitance of the board.
Figure 23.8 Connection Example of 32.768-kHz Quartz Oscillator
OSC1 OSC2
C s L s R s
C o
Co = 1.5 pF (typ)
Rs = 14 kΩ (typ)
fw = 32.768 kHz
Type name = C001R (SEIKO EPSON)
Figure 23.9 Equivalence Circuit for 32.768-kHz Oscillator