UPD17073 NEC, UPD17073 Datasheet - Page 220
UPD17073
Manufacturer Part Number
UPD17073
Description
4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
Manufacturer
NEC
Datasheet
1.UPD17073.pdf
(226 pages)
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APPENDIX A. NOTES ON CONNECTING CRYSTAL RESONATOR
as follows to avoid adverse influence of wiring capacitance:
220
(1) If the values of C1 and C2 are too high, the oscillation characteristics may be degraded or the current
(2) A trimmer capacitor for oscillation frequency adjustment is generally connected to the X
(3) Adjust the oscillation frequency while measuring the LCD drive waveform (62.5 Hz) or VCO oscillation
When connecting a crystal resonator to the PD17073, connect the part enclosed by dotted line in Figure A-1 below
• Keep the wiring length as short as possible.
• Do not cross the wiring with any other signal lines. Do not route the wiring in the vicinity of lines through which
• The ground of the capacitors of the oscillation circuit must be always at the same potential as GND. Do not
• Do not extract signals from the oscillation circuit.
To connect the capacitors or to adjust the oscillation frequency, keep in mind the following points (1) through (3):
a high current flows.
ground to a ground pattern through which a high current flows.
consumption increases.
the crystal resonator to be used, however, the oscillation stability may be degraded as a result of connecting
a trimmer capacitor to the X
evaluate oscillation by using the crystal resonator to be actually used.
frequency. If a probe is connected to the X
capacitance of the probe.
Figure A-1. Connecting Crystal Resonator
IN
C2
pin (in this case, connect the trimmer capacitor to the X
X
OUT
PD17073
OUT
or X
X
IN
IN
pin, accurate adjustment cannot be made due to the
C1
75 kHz crystal resonator
IN
OUT
pin. Depending on
PD17072,17073
pin). Therefore,
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