RXB0D2 datasheet(56/92 Pages) MICROCHIP

56 / 92 page

MCP2515

DS21801G-page 56

 2003-2012 Microchip Technology Inc.

FIGURE 8-3:

EXTERNAL SERIES RESONANT CRYSTAL OSCILLATOR CIRCUIT(1)

TABLE 8-1:

CAPACITOR SELECTION FOR

CERAMIC RESONATORS

TABLE 8-2:

CAPACITOR SELECTION FOR

CRYSTAL OSCILLATOR

330 k



74AS04

MCP2510

OSC1

To Other

Devices

XTAL

330 k



74AS04

0.1 mF

Note 1: Duty cycle restrictions must be observed (see Table 12-1).

Typical Capacitor Values Used:

Mode

Freq.

OSC1

OSC2

8.0 MHz

27 pF

16.0 MHz

22 pF

Capacitor values are for design guidance only:

These capacitors were tested with the resonators

listed below for basic start-up and operation. These

values are not optimized.

Different capacitor values may be required to

produce acceptable oscillator operation. The user

should test the performance of the oscillator over the

expected VDD and temperature range for the

application.

See the notes following Table 8-2 for additional

information.

Resonators Used:

4.0 MHz

8.0 MHz

16.0 MHz

Osc

Type(1)(4)

Crystal

Freq.(2)

Typical Capacitor

Values Tested:

4 MHz

27 pF

8 MHz

22 pF

20 MHz

15pF

Capacitor values are for design guidance only:

These capacitors were tested with the crystals listed

below for basic start-up and operation. These values

are not optimized.

Different capacitor values may be required to

produce acceptable oscillator operation. The user

should test the performance of the oscillator over the

expected VDD and temperature range for the

application.

See the notes following this Table for additional

information.

Crystals Used(3):

4.0 MHz

8.0 MHz

20.0 MHz

Note 1:

While higher capacitance increases the

stability of the oscillator, it also increases

the start-up time.

Since each resonator/crystal has its own

characteristics, the user should consult

the resonator/crystal manufacturer for

appropriate values of external

components.

RS may be required to avoid overdriving

crystals with low drive level specification.

Always verify oscillator performance over

the VDD and temperature range that is

expected for the application.

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