Datasheet

Table 57. Oscillator frequency specifications (continued)
Symbol Description Min. Typ. Max. Unit Notes
f
osc_hi_1
Oscillator crystal or resonator frequency —
high-frequency mode (low range)
(MCG_C2[RANGE]=01)
3 — 8 MHz
f
osc_hi_2
Oscillator crystal or resonator frequency —
high frequency mode (high range)
(MCG_C2[RANGE]=1x)
8 — 32 MHz
t
dc_extal
Input clock duty cycle (external clock mode) 40 50 60 %
t
cst
Crystal startup time — 32 kHz low-frequency,
low-power mode (HGO=0)
— 750 — ms 1, 2
Crystal startup time — 32 kHz low-frequency,
high-gain mode (HGO=1)
— 250 — ms
Crystal startup time — 8 MHz high-frequency
(MCG_C2[RANGE]=01), low-power mode
(HGO=0)
— 0.6 — ms
Crystal startup time — 8 MHz high-frequency
(MCG_C2[RANGE]=01), high-gain mode
(HGO=1)
— 1 — ms
1. Proper PC board layout procedures must be followed to achieve specifications.
2. Crystal startup time is defined as the time between the oscillator being enabled and the OSCINIT bit in the MCG_S
register being set.
NOTE
The 32 kHz oscillator works in low power mode by default
and cannot be moved into high power/gain mode.
5.4.2.4
32 kHz oscillator electrical characteristics
5.4.2.4.1 32 kHz oscillator DC electrical specifications
Table 58. 32kHz oscillator DC electrical specifications
Symbol Description Min. Typ. Max. Unit
V
BAT
Supply voltage 1.71 — 3.6 V
R
F
Internal feedback resistor — 100 — MΩ
C
para
Parasitical capacitance of EXTAL32 and
XTAL32
— 5 7 pF
V
pp
1
Peak-to-peak amplitude of oscillation — 0.6 — V
1. When a crystal is being used with the 32 kHz oscillator, the EXTAL32 and XTAL32 pins should only be connected to
required oscillator components and must not be connected to any other devices.
Electrical characteristics
94
Kinetis KL82 Microcontroller, Rev. 3, 08/2016
NXP Semiconductors