Real Time Clock interface


RTCVDD power +3v

RTCVSS ground

AUXOK - This signal is supplied from the power source of resume well. It also used to reset in resume power well. If there is no auxiliary power source on the system, this pin should be tied together with PWROK

BATOK - When the internal RTC is enabled, this signal is used to indicate that the power of RTC well is stable. It is also used to reset the logic in RTC well. If the internal RTC is disabled, this pin should be tied low.

OSC32KHI - When internal RTC is enabled, this pin provides the 32.768KHz clock signal from external crystal or oscillator.

OSC32KHO - When internal RTC is enabled, this pin should be connected the other end of the 32.768KHz crystal or left unconnected if an oscillator is used.

PWROK - A high-level input to this signal indicates the power being supplied to the system is in stable operating state. During the period of PWROK being low, CPURST and PCIRST# will all be asserted unit after PWROK goes to high for 24ms.