35.10.1 Internal Oscillators

Table 35-10. Internal Oscillators Specifications⁽¹⁾
Symbol	Description	Min.	Typ. ✝	Max.	Unit	Conditions
f_OSCHF	Precision calibrated OSCHF frequency	—	16	—	MHz	OSCHFFRQ = `0x01`
f_OSCHF	Precision calibrated OSCHF frequency	—	20	—	MHz	OSCHFFRQ = `0x00`
f_CAL	Frequency tune range	—	—	—	MHz	OSCHFFRQ = `0x01`
f_CAL	Frequency tune range	—	—	—	MHz	OSCHFFRQ = `0x00`
%_CAL	OSCHF tune step size	—	0.2	—	%
E_{OSCHF_TOTAL}	Total error with 16 MHz and 20 MHz frequency selection	—	<1	—	%	T_A = 25°C, V_DD = 3.0V
E_{OSCHF_TOTAL}	Total error with 16 MHz and 20 MHz frequency selection	—	<3	—	%	Full operation range
D_OSCHF	Duty cycle	—	50	—	%
t_{OSCHF_ST⁽³⁾}	OSCHF start-up time	—	10	—	μs	Within 2% accuracy
f_OSC32K	Internal OSC32K frequency	—	32.768	—	kHz
E_{OSC32K_TOTAL}	Total error from target frequency	—	<1	—	%	T_A = 25°C, V_DD = 3.0V
E_{OSC32K_TOTAL}	Total error from target frequency	—	<10	—	%	Full operation range
D_OSC32K	Duty cycle	—	50	—	%
t_{OSC32K_ST}⁽³⁾	OSC32K start-up time	—	220	—	μs
✝ Data in the “Typ.” column is at T_A = 25°C and V_DD = 3.0V unless otherwise specified. These parameters are not tested and are for design guidance only. Note: To ensure these oscillator frequency tolerances, V_DD and GND must be capacitively decoupled as close to the device as possible. 100 nF and 0.1 μF values in parallel are recommended. These values are based on characterization and are not covered by production test limits. Wake-up times are measured from the wake-up event to code execution.