Datasheet
25
CC1310
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SWRS181C –SEPTEMBER 2015–REVISED OCTOBER 2016
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SpecificationsCopyright © 2015–2016, Texas Instruments Incorporated
5.19.3 Clock Specifications
5.19.3.1 24-MHz Crystal Oscillator (XOSC_HF)
(1) Probing or otherwise stopping the crystal while the DC-DC converter is enabled may cause permanent damage to the device.
(2) The crystal start-up time is low because it is kick-started by using the RCOSC_HF oscillator (temperature and aging compensated) that
is running at the same frequency.
Measured on the Texas Instruments CC1310EM-7XD-7793 reference design with T
c
= 25°C, V
DDS
= 3.0 V, unless otherwise
noted.
(1)
MIN TYP MAX UNIT
Crystal frequency 24 MHz
ESR equivalent series resistance 20 60 Ω
L
M
motional inductance, relates to the load capacitance that is used for the
crystal (C
L
in Farads)
< 1.6 × 10
–24
/ C
L
2
H
C
L
crystal load capacitance 5 9 pF
Start-up time
(2)
150 µs
5.19.3.2 32.768-kHz Crystal Oscillator (XOSC_LF)
(1) Probing or otherwise stopping the crystal while the DC-DC converter is enabled may cause permanent damage to the device.
Measured on the Texas Instruments CC1310EM-7XD-7793 reference design with T
c
= 25°C, V
DDS
= 3.0 V, unless otherwise
noted.
(1)
MIN TYP MAX UNIT
Crystal frequency 32.768 kHz
ESR equivalent series resistance 30 100 kΩ
Crystal load capacitance (C
L
) 6 12 pF
5.19.3.3 48-MHz RC Oscillator (RCOSC_HF)
(1) Accuracy relative to the calibration source (XOSC_HF)
Measured on the Texas Instruments CC1310EM-7XD-7793 reference design with T
c
= 25°C, V
DDS
= 3.0 V, unless otherwise
noted.
MIN TYP MAX UNIT
Frequency 48 MHz
Uncalibrated frequency accuracy ±1%
Calibrated frequency accuracy
(1)
±0.25%
Startup time 5 µs
5.19.3.4 32-kHz RC Oscillator (RCOSC_LF)
(1) The frequency accuracy of the Real Time Clock (RTC) is not directly dependent on the frequency accuracy of the 32-kHz RC Oscillator.
The RTC can be calibrated to an accuracy within ±500 ppm of 32.768 kHz by measuring the frequency error of RCOSC_LF relative to
XOSC_HF and compensating the RTC tick speed.
Measured on the Texas Instruments CC1310EM-7XD-7793 reference design with T
c
= 25°C, V
DDS
= 3.0 V, unless otherwise
noted.
MIN TYP MAX UNIT
Calibrated frequency
(1)
32.768 kHz
Temperature coefficient 50 ppm/°C