38.5.1.1 Internal Oscillators

Table 38-10. Internal Oscillators Specifications(1)
SymbolDescriptionMin.Typ. ✝Max.UnitConditions
fOSCHFOSCHF frequency—

1(2)
2(2)
3(2)

—MHz
Precision calibrated OSCHF frequency—

4
8
12
16
20
24

—
%CALOSCHF tune step size—0.4—%
tOSCHF_ST(3)OSCHF wake-up from sleep start-up time—2430μs

Device in Idle or Standby sleep mode,
VREGCTRL.PMODE = FULL

—115180μs

Device in Power-Down sleep mode,
VREGCTRL.PMODE = AUTO

fOSC32KInternal OSC32K frequency—32.768—kHz
tOSC32K_ST(3)OSC32K wake-up from sleep start-up time—9501000μs

Device in Power-Down sleep mode,
VREGCTRL.PMODE = AUTO

✝ Data in the “Typ.” column is at TA = 25°C and VDD = 3.0V unless otherwise specified. These parameters are not tested and are for design guidance only.

Note:
  1. To ensure these oscillator frequency tolerances, VDD and GND must be capacitively decoupled as close to the device as possible. 100 nF and 0.1 μF values in parallel are recommended.
  2. These parameters are not calibrated.
  3. Wake-up times are measured from the wake-up event to code execution.
Figure 38-2. Precision Calibrated OSCHF (4 MHz) Frequency Accuracy Over Device VDD and Temperature