SWRS215D April 2019 – May 2021 CC3235S , CC3235SF
PRODUCTION DATA
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 8-9 shows the crystal connections for the slow clock.
Table 8-18 lists the 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 | kΩ |