cc3200 RTC校准

Hi

我们的应用里，使用cc3200的内部crystal给RTC提供时钟。

请问，这种配置下RTC可以达到什么样的精度？怎样给RTC校准？

谢谢

HH

精度请查阅芯片手册，RTC校准需要应用自行处理。

注意RTC使用了外部的32768的晶振，关于这部分的描述，请参考CC3200的芯片手册如下：

4.11.3 Clock Specifications
The CC3200 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 cheaper 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 reduce
overall cost.
4.11.3.1 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.

Hi Terry

我们的应用需要使用32K RC。

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.

请问在你贴的那段话里，the crystal是什么意思？难道我们外面还需要一个crystal？

Thanks

HH