35.10.1 Internal Oscillators

Table 35-10. Internal Oscillators Specifications⁽¹⁾
Operating Conditions: V_DDIO = V_DDMIN to V_DDMAX Temperature = -40 °C to +125 °C
Symbol	Description	Min.	Typ. ✝	Max.	Unit	Conditions
f_OSCHF	Precision-calibrated OSCHF frequency	—	16	—	MHz	OSCCFG.OSCHFFRQ = `0x1`
f_OSCHF	Precision-calibrated OSCHF frequency	—	20	—	MHz	OSCCFG.OSCHFFRQ = `0x0`
f_CAL	Frequency tune range	—	±10	—	%	OSCCFG.OSCHFFRQ = `0x1`
f_CAL	Frequency tune range	—	±10	—	%	OSCCFG.OSCHFFRQ = `0x0`
%_CAL	OSCHF tune step size	—	0.4	—	%
E_{OSCHF_TOTAL}	Total error with 16 MHz frequency selection⁽³⁾	-2	—	2	%	T_A = 25°C, V_DD = 3.0V
	Total error with 16 MHz frequency selection⁽³⁾	-4	—	4	%	Full operation range
	Total error with 20 MHz frequency selection⁽⁴⁾	-1.5	—	1.5	%	T_A = 25°C, V_DD = 3.0V
	Total error with 20 MHz frequency selection⁽⁴⁾	-3	—	3	%	Full operation range
D_OSCHF	OSCHF Duty cycle	—	50	—	%
t_{OSCHF_ST}⁽²⁾	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	-4	—	4	%	T_A = 25°C, V_DD = 3.0V
		-15	—	15	%	T_A < 85°C
		-20	—	20	%	Full operation range
D_OSC32K	OSC32K duty cycle	—	50	—	%
t_{OSC32K_ST}⁽²⁾	OSC32K Start-up time	—	220	—	μs
✝ Data in the “Typ.” column is measured 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 decoupled as close to the device as possible. 100 nF and 0.1 μF values in parallel are recommended. Wake-up times are measured from the wake-up event to code execution. The CLKCTRL.OSCHFTUNE is loaded from the Signature Row OSCHF16TUNE. The CLKCTRL.OSCHFTUNE is loaded from the Signature Row OSCHF20TUNE.