Datasheet

 2018 Microchip Technology Inc. Data Sheet Complete DS40002059A-page 95
ATxmega32E5/16E5/8E5
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
pFC
XTAL2
Parasitic capacitance
XTAL2 pin
7.1
C
LOAD
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 60
k
Crystal load capacitance 9.0pF 35
C
TOSC1
Parasitic capacitance TOSC1 pin 5.3
pF
C
TOSC2
Parasitic capacitance TOSC2 pin 7.4
Recommended safety factor
capacitance load matched to crystal
specification
3.0
Symbol Parameter Condition Min. Typ. Max. Units
C
L1
C
L2
2CS
O
T
1
CS
O
T
Device internal
External
32.768kHz crystal