22919 Slajd16 (165)

BQ48o2 - PARAJLLEL REAL-TIME CLOCK

TERMINAL		l/O	DESCRIPTION
NAME	NO.
WDI	23	1	WDIisathreedevelinput.lfWDIremainseitherhighorlowforlongerthan the watchdog time-outperiod( 1.5-sdefault), WDO goes Iow WDO remains Iow until the next transition at WDI. Leaving WDI unconnected disables the watchdog function. WDI connects to an internal voltage divider between Vqut ^and Vss, which sets it to mid-supply when left unconnected.
WDO	4		WDO goes Iow if WDI remains either high or Iow longer than the watchdog time-out period. WDO returns high on the next transition at WDI. WDO remains high if WDI is unconnected
WE	27		WE provides the write control for the RTC memory locations.
XI	2d)		Crystal connection
X2	3(1)