Texas Instruments CC35 E Series - Page 20

2.3 Clocking
The LP-EM-CC35X1 provides two clock inputs to the CC35xxE device:
• Y2 is a 40MHz crystal for fast clock input.
• Y1 is a 32.768kHz XTAL for slow clock input.
40 MHz
XTAL
(HFXT)
32.768kHz
XTAL
(LFXT)
Figure 2-24. Clocks
The slow clock can be generated by an external oscillator instead of the XTAL, or generated internally by the
CC35xxE.
If the user want to provide the own external slow clock through LaunchPad header pin (pin 2), then:
• Remove Y1 XTAL
• Populate 0 ohm resistor (0201) on the R5 pad.
• Remove C6 capacitor
See Figure 2-25.
R5
C6
Y1
Figure 2-25. External Slow Clock
To use the CC35xxE internal slow clock, leave pin 2 floating when Y1 is not placed.
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20 CC35xxE LaunchPad™ Development Kit for SimpleLink™ Wi-Fi 6 and
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