标题: nrf51822 System OFF mode 模式问题 [打印本页] 作者: gasonchen 时间: 2017-1-12 14:09 标题: nrf51822 System OFF mode 模式问题 请问在nrf51822 System OFF mode 模式时，RTC的计数器还能计数吗？
作者: gasonchen 时间: 2017-1-12 18:52
In system off mode, all clock sources and peripherals on the chip are turned off, and the only wakeup source is reset and pin change (for those that have this enabled). As given in table23 in the Product Specification, the current consumption in this mode is typical 0.4 µA without any RAM retention.
In section 8.1 of the S110 SoftDevice Specification, the current profile of the softdevice in different states are shown. In between connection events, the chip will be in system on, with the RTC running. Depending on whether you use a 32 kHz crystal or the internal RC oscillator, this gives a total consumption of I_on + I _RTC + I_X32k, typical 2.3 + 0.2 + 0.4 = 2.9 µA or i_on + I_RTC + I_RC32k = 2.3 + 0.2 + 0.8 = 3.3 µA.