CC3220 Datasheet, PDF (38/84 Pages) Texas Instruments – SimpleLink Wi-Fi Wireless and Internet-of-Things Solution, a Single-Chip Wireless MCU

CC3220
SWAS035A – SEPTEMBER 2016 – REVISED FEBRUARY 2017
Figure 4-9 shows the crystal connections for the slow clock.
51
RTC_XTAL_P
32.768 kHz
10 pF
GND
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RTC_XTAL_N ⁵²
10 pF
GND
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Figure 4-9. RTC Crystal Connections
Table 4-5 lists the RTC crystal requirements.
CHARACTERISTICS
Frequency
Frequency accuracy
Crystal ESR
Table 4-5. RTC Crystal Requirements
TEST CONDITIONS
MIN
Initial plus temperature plus aging
32.768 kHz
TYP
32.768
MAX
±150
70
UNIT
kHz
ppm
kΩ
4.14.4.2 Slow Clock Using an External Clock
When an RTC oscillator is present in the system, the CC3220x device can accept this clock directly as an
input. The clock is fed on the RTC_XTAL_P line, and the RTC_XTAL_N line is held to VIO. The clock
must be a CMOS-level clock compatible with VIO fed to the device.
Figure 4-10 shows the external RTC input connection.
RTC_XTAL_P
RTC_XTAL_N
32.768 kHz
VIO
100 KΩ
Host system
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Figure 4-10. External RTC Input
38
Specifications
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