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CC1312R

SWRS210 – JANUARY 2018

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Specifications

Copyright © 2018, Texas Instruments Incorporated

5.12.1 Clock Specifications

(1)

Probing or otherwise stopping the crystal while the DC/DC converter is enabled may cause permanent damage to the device.

(2)

Adjustable load capacitance is integrated into the device. External load capacitors are required for systems targeting compliance

with ARIB T-108 and 450–470 MHz frequency bands.When external load capacitance is used, the internal capacitance must be set to

zero through software configuration in the Customer Configuration Section (CCFG). See the device errata for further details.

(3)

On-chip default connected capacitance including reference design parasitic capacitance. Connected internal capacitance is changed

through software in the Customer Configuration section (CCFG)

(4)

The crystal start-up time is fast because it is "kick-started" using the RCOSC_HF oscillator (temperature and aging compensated by

default) that is running at the same frequency. This number will increase if disabling the calibration of RCOSC_HF in the TI-provided

power driver

Table 5-3. 48-MHz Crystal Oscillator (XOSC_HF)

(1)

MIN

TYP

MAX

UNIT

Crystal frequency

48

MHz

ESR equivalent series resistance

60

Ω

H

(2)

5

9

pF

250

µs

(1)

Probing or otherwise stopping the crystal while the DC/DC converter is enabled may cause permanent damage to the device.

(2)

Default load capacitance using TI reference designs including parasitic capacitance. Crystals with different load capacitance may be

used.

Table 5-4. 32.768-kHz Crystal Oscillator (XOSC_LF)

(1)

MIN

TYP

MAX

UNIT

Crystal frequency

32.768

kHz

ESR Equivalent series resistance

30

100

k

Ω

6

12

pF

(1)

Accuracy relatively to the calibration source (XOSC_HF).

Table 5-5. 48-MHz RC Oscillator (RCOSC_HF)

MIN

TYP

MAX

UNIT

Frequency

48

MHz

Uncalibrated frequency accuracy

±1%

±0.25%

Start-up time

5

µs

Table 5-6. 2-MHz RC Oscillator (RCOSC_MF)

MIN

TYP

MAX

UNIT

Calibrated frequency

2

MHz

Temperature coefficient

ppm/°C

Start-up time

µs

Table 5-7. 32-kHz RC Oscillator (RCOSC_LF)

MIN

TYP

MAX

UNIT

Calibrated frequency

32.768

kHz

Temperature coefficient

50

ppm/°C