34.12.3 Digital-Frequency Locked Loop (DFLL48M) Characteristics

The following tables provide the characteristics of the DFLL48M.

Table 34-37. DFLL48M Characteristics - Open Loop Mode
SymbolParameterConditionsMin.Typ.Max.Units
fOUTOutput frequencyDFLLVAL.COARSE = DFLL48M COARSE CAL DFLLVAL.FINE = 512 over [-40, +125]C, over [2.7, 3.6]V44.5048.0051.75MHz
fOUTOutput frequencyDFLLVAL.COARSE = DFLL48M COARSE CAL DFLLVAL.FINE = 512 at Ta = 25°C, over [2.7, 3.6]V46.6048.0049.40MHz
IDFLLPower consumption on VDDINDFLLVAL.COARSE = DFLL48M COARSE CAL DFLLVAL.FINE = 512-403457µA
tSTARTUPStartup timeDFLLVAL.COARSE = DFLL48M COARSE CAL DFLLVAL.FINE = 512 fOUT within 90 % of final value-812µs
Table 34-38. DFLL48M Characteristics - Closed-Loop Mode(1)(2)
SymbolParameterConditionsMin.Typ.Max.Units
fOUTAverage Output frequencyfREF = XOSC32K 32.768 kHz, 100 ppm

DFLLMUL = 1464

47.5048.0048.44MHz
fREFReference frequency0.73232.76833kHz
IDFLLPower consumption on VDDINfREF = XOSC32K 32.768 kHz, 100 ppm-457-μA
tLOCKLock time

fREF = XOSC32K 32.768 kHz
, 100 ppm

DFLLMUL = 1464

DFLLVAL.COARSE =
 DFLL48M COARSE CAL


DFLLVAL.FINE = 512


DFLLCTRL.BPLCKC = 1


DFLLCTRL.QLDIS = 0


DFLLCTRL.CCDIS = 1


DFLLMUL.FSTEP = 10

-350-μs
Note:
  1. Refer to the revision C/revision B errata related to the DFLL48M.
  2. All parts are tested in production to be able to use the DFLL as the main CPU clock in DFLL Closed Loop mode with an external XOSC32K reference.