ELANSC310 datasheet(85/119 Pages) AMD

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Élan™SC310 Microcontroller Data Sheet

PREL IMINARY

frequency. It is therefore required that the load capaci-

tance in the oscillator circuit is duplicated as closely as

possible to the manufacturer’s load capacitance speci-

fication.

The crystal load capacitance in the circuit consists of

the capacitor network C

O, CSTRAY, CD, and CG. This net-

work reduces to (C

O + CSTRAY) in parallel with the series

combination of C

D and CG. Therefore, the desired se-

ries combination of C

D and CG is equal to CL – (CO +

CSTRAY), where CL is the crystal manufacturer’s load ca-

pacitance specification.

STRAY is typically difficult to determine. Some value

can be assumed and experimentation will determine

the optimal value for CD and CG. In determining the ex-

ternal component values to provide the optimal operat-

ing frequency, there are some recommended limits to

ensure a reasonable start-up time for the oscillator cir-

cuit. These limits are shown in Table 43.

The series combination of CD and CG =

(

×)

G )

(

---------------------------







Table 43.

Recommended Oscillator Component

Value Limits

Minimum

Maximum

14 M

Ω

18 M

Ω

10 k

Ω

10 pF

30 pF

10 pF

30 pF

ÉlanSC310 Microcontroller

X32IN (201)

X32OUT (202)

XTAL

CSTRAY

Notes:

For board layout suggestions, refer to the ÉlanSC310 Microcontroller Evaluation Board User’s Manual available in PDF format

on the AMD web site.

Figure 29.

X32 Oscillator Circuit

ELANSC310 Datasheet(PDF) 85 Page - Advanced Micro Devices

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