Datasheet

89XMEGA E5 [DATASHEET]
Atmel-8153H–AVR-ATxmega8E5-ATxmega16E5-ATxmega32E5_Datasheet–07/2014
Note: 1. 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: 1. See Figure 36-4 for definition.
Figure 36-4. TOSC input capacitance.
The parasitic capacitance between the TOSC pins is C
L1
+ C
L2
in series as seen from the crystal when oscillating without
external capacitors.
C
XTAL1
Parasitic capacitance
XTAL1 pin
5.4
pF
C
XTAL2
Parasitic capacitance
XTAL2 pin
7.1
C
LOAD
Parasitic capacitance load 3.07
Symbol Parameter Condition Min. Typ. Max. Units
Symbol Parameter Condition Min. Typ. Max. Units
ESR/R1
Recommended crystal equivalent
series resistance (ESR)
Crystal load capacitance 6.5pF 60
kΩ
Crystal load capacitance 9.0pF 35
C
TOSC1
Parasitic capacitance TOSC1 pin 5.3 pF
C
TOSC2
Parasitic capacitance TOSC2 pin 7.4 pF
Recommended safety factor
capacitance load matched to
crystal specification
3.0
C
L1
C
L2
2CS
O
T
1
CS
O
T
Device internal
External
32.768kHz crystal