Hitachi SH7032 - Page 131

96
XTAL
EXTAL
C
L1
= C
L2
=10–22 pF
C
L1
Rd
C
L2
Figure 7.2 Connection of Crystal Resonator (Example)
Table 7.1 Damping Resistance
Frequency [MHz] 2 4 8 12 16 20
Rd [Ω] 1k 500 200 0 0 0
Crystal Resonator: Figure 7.3 shows an equivalent circuit of the crystal resonator. Use a crystal
resonator with the characteristics listed in table 7.2.
C
0
XTAL EXTAL
C
L
LRs
Figure 7.3 Crystal Resonator Equivalent Circuit
Table 7.2 Crystal Resonator Parameters
Frequency (MHz)
Parameter 2 4 8 12 16 20
Rs max [Ω] 500 120 80 60 50 40
Co max [pF] 7 7 7 7 7 7