Parts List/Tune Up Info

19
CC2642R
www.ti.com SWRS194G –JANUARY 2018 – REVISED APRIL 2020
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Specifications
Copyright © 2018–2020, 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) The crystal manufacturer's specification must satisfy this requirement for proper operation.
(3) Adjustable load capacitance is integrated into the device.
(4) On-chip default connected capacitance including reference design parasitic capacitance. Connected internal capacitance is changed
through software in the Customer Configuration section (CCFG).
(5) Start-up time using the TI-provided power driver. Start-up time may increase if driver is not used.
Table 5-3. 48 MHz Crystal Oscillator (XOSC_HF)
Measured on a Texas Instruments reference design with T
c
=25°C,V
DDS
= 3.0 V, unless otherwise noted.
(1)
PARAMETER MIN TYP MAX UNIT
Crystal frequency 48 MHz
ESR
Equivalent series resistance
6pF<C
L
 9pF
20 60 ȍ
ESR
Equivalent series resistance
5pF<C
L
 6pF
80 ȍ
L
M
Motional inductance, relates to the load capacitance that is used for the crystal (C
L
in Farads)
(2)
<3×10
–25
/C
L
2
H
C
L
Crystal load capacitance
(3)
57
(4)
9pF
Start-up time
(5)
200 μs
(1) Accuracy relative to the calibration source (XOSC_HF)
Table 5-4. 48 MHz RC Oscillator (RCOSC_HF)
Measured on a Texas Instruments 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 %
Start-up time 5 μs
Table 5-5. 2 MHz RC Oscillator (RCOSC_MF)
Measured on a Texas Instruments reference design with T
c
=25°C,V
DDS
= 3.0 V, unless otherwise noted.
MIN TYP MAX UNIT
Calibrated frequency 2MHz
Start-up time 5 μs
(1) Default load capacitance using TI reference designs including parasitic capacitance. Crystals with different load capacitance may be
used.
Table 5-6. 32.768 kHz Crystal Oscillator (XOSC_LF)
Measured on a Texas Instruments reference design with T
c
=25°C,V
DDS
= 3.0 V, unless otherwise noted.
MIN TYP MAX UNIT
Crystal frequency 32.768 kHz
ESR Equivalent series resistance 30 100 k
C
L
Crystal load capacitance 67
(1)
12 pF
(1) When using RCOSC_LF as source for the low frequency system clock (SCLK_LF), the accuracy of the SCLK_LF-derived Real Time
Clock (RTC) can be improved by measuring RCOSC_LF relative to XOSC_HF and compensating for the RTC tick speed. This
functionality is available through the TI-provided Power driver.
Table 5-7. 32 kHz RC Oscillator (RCOSC_LF)
Measured on a Texas Instruments reference design with T
c
=25°C,V
DDS
= 3.0 V, unless otherwise noted.
MIN TYP MAX UNIT
Calibrated frequency 32.8
(1)
kHz
Temperature coefficient 50 ppm/°C