Atmel Xplained Evaluation Board AT32UC3L0-XPLD AT32UC3L0-XPLD Datenbogen

32099G–06/2011

Oscillator Connection

 and the equation above also applies to the 32 KHz oscillator connection. The user

must choose a crystal oscillator where the crystal load capacitance C

L

 is within the range given

in the table. The exact value of C

L

 can then be found in the crystal datasheet.

Notes:

1. Nominal crystal cycles.

2. These values are based on simulation and characterization of other AVR microcontrollers manufactured in the same pro-

cess technology. These values are not covered by test limits in production.

XIN

XOUT

C

LEXT

C

LEXT

C

L

C

i

UC3L

32 KHz Crystal Oscillator Characteristics

f

OUT

Crystal oscillator frequency

32 768

Hz

t

STARTUP

Startup time

R

S

 = 60kOhm, C

L

 = 9pF

30 000

cycles

C

L

Crystal load capacitance

6

12.5

pF

C

i

Internal equivalent load 
capacitance

2

I

OSC32

Current consumption

0.9

µA

R

S

Equivalent series resistance

32 768Hz

35

85

kOhm