Z8F082A28100KIT ZILOG [Zilog, Inc.], Z8F082A28100KIT Datasheet - Page 185
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Z8F082A28100KIT
Manufacturer Part Number
Z8F082A28100KIT
Description
Z8 Encore XP-R F08xA Series with eXtended Peripherals
Manufacturer
ZILOG [Zilog, Inc.]
Datasheet
1.Z8F082A28100KIT.pdf
(244 pages)
- Current page: 185 of 244
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Oscillator Operation with an External RC Network
PS024705-0405
Figure 26.Connecting the On-Chip Oscillator to an External RC Network
Oscillator Frequency (kHz)
Figure 26 illustrates a recommended configuration for connection with an external resis-
tor-capacitor (RC) network.
An external resistance value of 45KΩ is recommended for oscillator operation with an
external RC network. The minimum resistance value to ensure operation is 40KΩ. The
typical oscillator frequency can be estimated from the values of the resistor (R in KΩ) and
capacitor (C in pF) elements using the following equation:
Figure 27 illustrates the typical (3.3V and 25
capacitor (C in pF) employed in the RC network assuming a 45KΩ external resistor. For
very small values of C, the parasitic capacitance of the oscillator XIN pin and the printed
circuit board should be included in the estimation of the oscillator frequency.
It is possible to operate the RC oscillator using only the parasitic capacitance of the pack-
age and printed circuit board. To minimize sensitivity to external parasitics, external
capacitance values in excess of 20pF are recommended.
VDD
P R E L I M I N A R Y
=
R
C
--------------------------------------------------------- -
(
0.4 R C
×
X
IN
1
×
×10
0
C) oscillator frequency as a function of the
)
6
+
(
4 C
×
Z8 Encore! XP
)
Product Specification
®
F08xA Series
Crystal Oscillator
167
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