HD404818 Datasheet, PDF (41/100 Pages) Hitachi Semiconductor – 16-digit LCD driver

Table 18 Examples of Oscillator Circuits (cont)
Crystal oscillator
Circuit Configuration
C₁
X1
Crystal
X2
C₂
GND
HD404818 Series
Circuit Constants
Crystal: 32.768 kHz: MX38T
(Nippon Denpa Kogyo)
C₁: = 20 pF ± 20%
C₂: = 20 pF ± 20%
R_S: = 14 kΩ
C₀: = 1.5 pF
L C_S R_S
C₀
Notes: 1.
The circuit parameters above are recommended by the crystal or ceramic oscillator
manufacturer. The circuit parameters are affected by the crystal or ceramic oscillator and floating
capacitance when designing the board. When using the oscillator, consult with the crystal or
ceramic oscillator manufacturer to determine the circuit parameters.
2. Writing among OSC₁ and OSC₂ or X1 and X2, and other elements should be as short as
possible, and should not cross other wires. Refer to figure 21.
3. When the 32.768-kHz crystal oscillator is not used, pin X1 must be fixed to V_cc and pin X2 must
be left open.
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