ATXMEGA32D4-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATXMEGA32D4-CU

8/16-bit Atmel XMEGA D4 Microcontroller

Atmel Corporation 

XMEGA D4

32.13.8 External 32.768kHz crystal oscillator and TOSC characteristics

Table 32-27. External 32.768kHz crystal oscillator and TOSC characteristics.

Symbol Parameter

Condition

ESR/R1

Recommended crystal equivalent

series resistance (ESR)

Crystal load capacitance 6.5pF

Crystal load capacitance 9.0pF

CTOSC1 Parasitic capacitance TOSC1 pin

Alternate TOSC

CTOSC2 Parasitic capacitance TOSC2 pin

Recommended safety factor

Alternate TOSC

capacitance load matched to

crystal specification

Note: 1. See Figure 32-4 for definition.

Figure 32-4. TOSC input capacitance.

Min.

3

Typ.

5.4

4.0

7.1

4.0

Max.

60

35

Units

kΩ

pF

pF

TOSC1

CL1

CL2

Device internal

External

TOSC2

32.768KHz crystal

The parasitic capacitance between the TOSC pins is CL1 + CL2 in series as seen from the crystal

when oscillating without external capacitors.

80

8135L–AVR–06/12

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