|IREFO||REFO oscillator current consumption||TA = 25°C||3 V||15||µA|
|fREFO||REFO calibrated frequency||Measured at MCLK||3 V||32768||Hz|
|REFO absolute calibrated tolerance||–40°C to 85°C||1.8 V to 3.6 V||–3.5%||+3.5%|
|dfREFO/dT||REFO frequency temperature drift||Measured at MCLK(1)||3 V||0.01||%/°C|
|dfREFO/ dVCC||REFO frequency supply voltage drift||Measured at MCLK at 25°C(2)||1.8 V to 3.6 V||1||%/V|
|fDC||REFO duty cycle||Measured at MCLK||1.8 V to 3.6 V||40%||50%||60%|
|tSTART||REFO start-up time||40% to 60% duty cycle||50||µs|
Table 5-8 lists the characteristics of the VLO.
The VLO clock frequency is reduced by 15% (typical) when the device switches from active mode to LPM3 or LPM4, because the reference changes. This lower frequency is not a violation of the VLO specifications (see Table 5-8).