ATXMEGA8E5 datasheet(95/153 Pages) MICROCHIP

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Data Sheet Complete

DS40002059A-page 95

ATxmega32E5/16E5/8E5

Note:

Numbers for negative impedance are not tested in production but guaranteed from design and characterization.

36.13.8

External 32.768kHz Crystal Oscillator and TOSC Characteristics

Table 36-28. External 32.768kHz Crystal Oscillator and TOSC Characteristics

Note:

See Figure 36-4 for definition.

Figure 36-4. TOSC Input Capacitance

The parasitic capacitance between the TOSC pins is CL1 + CL2 in series as seen from the crystal when oscillating without

external capacitors.

CXTAL1

Parasitic capacitance

XTAL1 pin

5.4

CXTAL2

Parasitic capacitance

XTAL2 pin

7.1

CLOAD

Parasitic capacitance

load

3.07

Symbol

Parameter

Condition

Min.

Typ.

Max.

Units

ESR/R1

Recommended crystal equivalent

series resistance (ESR)

Crystal load capacitance 6.5pF



Crystal load capacitance 9.0pF

CTOSC1

Parasitic capacitance TOSC1 pin

5.3

CTOSC2

Parasitic capacitance TOSC2 pin

7.4

Recommended safety factor

capacitance load matched to crystal

specification

3.0

Symbol

Parameter

Condition

Min.

Typ.

Max.

Units

CL1

CL2

Device internal

External

32.768kHz crystal

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