![]() The active-low PWR pin is under software control, so that when a task is complete, the system power can then be shut down.įor all devices, the date at the end of the month is automatically adjusted for months with fewer than 31 days, including correction for leap years. The active-low PWR output pin is triggered by one or either of these events, and is used to turn on an external power supply. On by an external stimulus such as a keyboard or by a time-and-date (wake-up) alarm. The DS17x85 and DS17x87 power-control circuitry allows the system to be powered The DS17287, DS17487, and DS17887 (hereafter referred to as the DS17x87) integrate a quartz crystal and lithium energy source into a 24-pin encapsulated DIP package. The DS17x85 also incorporates a number of enhanced functions including a silicon serial number, power-on/off control circuitry, and 2K, 4K, or 8Kbytes of battery-backed NV SRAM. The DS17285, DS17485, and DS17885 (hereafter referred to as the DS17x85) provide a real-time clock/calendar, one time-of-day alarm, three maskable interrupts with a common interrupt output, a programmable square wave, and 114 bytes of battery-backed NV SRAM. Optional Industrial Temperature Range Available.Optional Encapsulated DIP (EDIP) Package with Integrated Crystal and Battery (DS17287, DS17487, DS17887).Automatic Power-Fail Detect and Switch Circuitry.Time-of-Day Alarm Once per Second to Once per Day.Interrupt Output with Six Independently Maskable Interrupt Flags.114 Bytes of General-Purpose, Battery-Backed NV SRAM. ![]() 12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode.Crystal Select Bit Allows Operation with 6pF or 12.5pF Crystal.Power-Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure.RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099.Incorporates Industry-Standard DS12887 PC Clock Plus Enhanced Functions.
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