CC2640 不使用外部32K晶振会有哪些功能收到影响？作为主机是否必须使用外部32K晶振？

如题，看到官方文档www.ti.com/…/swra499b.pdf中提到可以省去外部32K晶振，不知道这样做会不会有部分功能异常。功耗是否偏大？

YiKai Chen：

功耗會大一點

Viki Shi：

1、主要是功耗方面，文档里有列出：
Using the internal RCOSC_LF as the sleep clock has a net effect on the device current consumption as compared to board designs that utilize an external 32 kHz crystal oscillator. The difference in current consumption varies depending on the configured role of the device. For peripheral (slave) devices in a Bluetooth low energy connection, the current consumption will be higher when using the RCOSC_LF as compared to using an external 32 kHz crystal。

2、是的。
The 32 kHz crystal-less feature is supported on CC2640/CC2650 wireless MCUs implementing the Bluetooth low energy peripheral, observer and broadcast (beacon) roles only. Thus, all central role or master devices must use the 32 kHz crystal oscillator.

da qin zheng sheng：

如果工作温度范围比较大，建议使用外部32k晶振。

shakencity：

我觉得就稳定性 功耗 温升等各个方面来看，还是尽量不要省去外部晶振