PIC17C752-08SLASHCL datasheet(16/328 Pages) MICROCHIP

16 / 328 page

PIC17C7XX

DS30289A-page 16

FIGURE 4-2:

CRYSTAL OR CERAMIC

RESONATOR OPERATION (XT

OR LF OSC CONFIGURATION)

TABLE 4-1:

CAPACITOR SELECTION

FOR CERAMIC

RESONATORS

Oscillator

Type

Resonator

Frequency

Capacitor Range

C1 = C2 (1)

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 resonator has its own

characteristics, the user should consult the resonator manu-

facturer for appropriate values of external components.

Note 1: These values include all board capacitances

on this pin. Actual capacitor value depends

on board capacitance

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.

See Table 4-1 and Table 4-2 for recommended values of

C1 and C2.

Note 1: A series resistor (Rs) may be required for

AT strip cut crystals.

XTAL

OSC2

Note1

OSC1

SLEEP

PIC17CXXX

To internal

logic

FIGURE 4-3:

CRYSTAL OPERATION,

OVERTONE CRYSTALS (XT

OSC CONFIGURATION)

TABLE 4-2:

CAPACITOR SELECTION FOR

CRYSTAL OSCILLATOR

Osc

Type

Freq

C1 (3)

C2 (3)

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

10 pF

47-100 pF

15-68 pF

15-47 pF

TBD

15-47 pF

10 pF

Higher capacitance increases the stability of the oscillator

but also increases the start-up time and the oscillator cur-

rent. These values are for design guidance only. RS may be

required in XT mode to avoid overdriving the crystals with

low drive level speciﬁcation. Since each crystal has its own

characteristics, the user should consult the crystal manufac-

turer 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.

3: These values include all board capacitances

on this pin. Actual capacitor value depends

on board capacitance

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

0.1

µF

SLEEP

OSC2

OSC1

PIC17CXXX

To ﬁlter the fundamental frequency

L*C2

= (2

πf)2

Where f = tank circuit resonant frequency. This should be

midway between the fundamental and the 3rd overtone

frequencies of the crystal.

C3 handles current during charging of tank circuit.

PIC17C752-08/CL Datasheet(PDF) 16 Page - Microchip Technology

PIC17C752-08/CL Datasheet(HTML) 16 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL