The DS12R885 is a functional drop-in replacement for the DS12885 real-time clock (RTC). The device provides an RTC/calendar, one time-of-day alarm, three maskable interrupts with a common interrupt output, a programmable square wave, and 114 bytes of battery-backed static RAM. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including correction for leap years. It also operates in either 24-hour or 12-hour format with an AM/PM indicator. A precision temperature-compensated circuit monitors the status of VCC. If a primary power failure is detected, the device automatically switches to a backup supply. The VBACKUP pin supports a rechargeable battery or a super cap and includes an integrated, always enabled trickle charger. The DS12R885 is accessed through a multiplexed byte-wide interface, which supports both Intel and Motorola modes. The DS12CR887 and DS12R887 integrate the DS12R885 die with a crystal and battery.
Key Features
Applications/Uses
Trickle-Charge Capability for a Rechargeable Battery or Super Cap
Selectable Intel or Motorola Bus Timing
RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation to 2100
Interrupt Output with Three Independently Maskable Interrupt Flags
Time-of-Day Alarm is Once-per-Second to Once-per-Day
Periodic Rates from 122µs to 500ms
End-of-Clock Update Cycle Flag
14 Bytes of Clock and Control Registers
114 Bytes of General-Purpose Battery-Backed NV RAM with Clear Input
Programmable Square-Wave Output
Automatic Power-Fail Detect and Switch Circuitry
+5.0V or +3.3V Operation
Industrial Temperature Range
DS12CR887 Encapsulated DIP (EDIP) Module with Integrated Battery and Crystal
DS12R887 BGA Module Surface-Mountable Package with Integrated Crystal and Rechargeable Battery
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