PIC17C44-08SLASHP datasheet(101/240 Pages) MICROCHIP

101 / 240 page

DS30412C-page 101

PIC17C4X

FIGURE 14-3: CRYSTAL OPERATION,

OVERTONE CRYSTALS (XT

OSC CONFIGURATION)

TABLE 14-2:

CAPACITOR SELECTION

FOR CERAMIC

RESONATORS

Oscillator

Type

Resonator

Frequency

Capacitor Range

C1 = C2

455 kHz

2.0 MHz

15 - 68 pF

10 - 33 pF

4.0 MHz

8.0 MHz

16.0 MHz

22 - 68 pF

33 - 100 pF

Higher capacitance increases the stability of the

oscillator but also increases the start-up time. These

values are for design guidance only. Since each reso-

nator has its own characteristics, the user should

consult the resonator manufacturer for appropriate

values of external components.

Resonators Used:

455 kHz

Panasonic EFO-A455K04B

± 0.3%

2.0 MHz

Murata Erie CSA2.00MG

± 0.5%

4.0 MHz

Murata Erie CSA4.00MG

± 0.5%

8.0 MHz

Murata Erie CSA8.00MT

± 0.5%

16.0 MHz

Murata Erie CSA16.00MX

± 0.5%

Resonators used did not have built-in capacitors.

0.1

µF

SLEEP

OSC2

OSC1

PIC17C42

To ﬁlter the fundamental frequency

LC2

= (2

πf)2

Where f = tank circuit resonant frequency. This should be

midway between the fundamental and the 3rd overtone

frequencies of the crystal.

TABLE 14-3:

CAPACITOR SELECTION

FOR CRYSTAL OSCILLATOR

14.2.3

EXTERNAL CLOCK OSCILLATOR

In the EC oscillator mode, the OSC1 input can be

driven

CMOS

drivers.

this

mode,

the

OSC1/CLKIN pin is hi-impedance and the OSC2/CLK-

OUT pin is the CLKOUT output (4 TOSC).

FIGURE 14-4: EXTERNAL CLOCK INPUT

OPERATION (EC OSC

CONFIGURATION)

Osc

Type

Freq

32 kHz(1)

1 MHz

2 MHz

100-150 pF

10-33 pF

100-150 pF

10-33 pF

2 MHz

4 MHz

8 MHz (2)

16 MHz

25 MHz

32 MHz (3)

47-100 pF

15-68 pF

15-47 pF

TBD

15-47 pF

0 (3)

47-100 pF

15-68 pF

15-47 pF

TBD

15-47 pF

0 (3)

Higher capacitance increases the stability of the

oscillator but also increases the start-up time and the

oscillator current. These values are for design guid-

ance only. RS may be required in XT mode to avoid

overdriving the crystals with low drive level speciﬁca-

tion. Since each crystal has its own characteristics,

the user should consult the crystal manufacturer for

appropriate values for external components.

Note 1: For VDD > 4.5V, C1 = C2

≈ 30 pF is recom-

mended.

2: RS of 330

Ω is required for a capacitor com-

bination of 15/15 pF.

Only the capacitance of the board was present.

Crystals Used:

32.768 kHz

Epson C-001R32.768K-A

± 20 PPM

1.0 MHz

ECS-10-13-1

± 50 PPM

2.0 MHz

ECS-20-20-1

± 50 PPM

4.0 MHz

ECS-40-20-1

± 50 PPM

8.0 MHz

ECS ECS-80-S-4

ECS-80-18-1

± 50 PPM

16.0 MHz

ECS-160-20-1

TBD

25 MHz

CTS CTS25M

± 50 PPM

32 MHz

CRYSTEK HF-2

± 50 PPM

Clock from

ext. system

OSC1

OSC2

PIC17CXX

CLKOUT

(FOSC/4)

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