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CC3135 Datasheet(PDF) 32 Page - Texas Instruments

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Part No. CC3135
Description  SimpleLink Wi-Fi, Dual-Band Network Processor, solution for MCU applications
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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CC3135 Datasheet(HTML) 32 Page - Texas Instruments

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RTC_XTAL_P
RTC_XTAL_N
51
52
32.768 kHz
10 pF
GND
GND
10 pF
Copyright © 2017, Texas Instruments Incorporated
32
CC3135
SWAS037 – JANUARY 2019
www.ti.com
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Product Folder Links: CC3135
Specifications
Copyright © 2019, Texas Instruments Incorporated
5.17.5 Clock Specifications
The CC3135 device requires two separate clocks for its operation:
A slow clock running at 32.768 kHz is used for the RTC.
A fast clock running at 40 MHz is used by the device for the internal processor and the WLAN
subsystem.
The device features internal oscillators that enable the use of less-expensive crystals rather than
dedicated TCXOs for these clocks. The RTC can also be fed externally to provide reuse of an existing
clock on the system and to reduce overall cost.
5.17.5.1 Slow Clock Using Internal Oscillator
The RTC crystal connected on the device supplies the free-running slow clock. The accuracy of the slow
clock frequency must be 32.768 kHz ±150 ppm. In this mode of operation, the crystal is tied between
RTC_XTAL_P (pin 51) and RTC_XTAL_N (pin 52) with a suitable load capacitance to meet the ppm
requirement.
Figure 5-9 shows the crystal connections for the slow clock.
Figure 5-9. RTC Crystal Connections
Table 5-14 lists the RTC crystal requirements.
Table 5-14. RTC Crystal Requirements
CHARACTERISTICS
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Frequency
32.768
kHz
Frequency accuracy
Initial plus temperature plus aging
±150
ppm
Crystal ESR
32.768 kHz
70


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