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DS12R885-5 Datasheet(PDF) 1 Page - Dallas Semiconductor |
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DS12R885-5 Datasheet(HTML) 1 Page - Dallas Semiconductor |
1 / 22 page General Description The DS12R885 is a functional drop-in replacement for the DS12885 real-time clock (RTC). The device pro- vides 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 oper- ates 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 back- up 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. Applications Embedded Systems Utility Meters Security Systems Network Hubs, Bridges, and Routers Features ♦ 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 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 RTC with Constant-Voltage Trickle Charger ______________________________________________ Maxim Integrated Products 1 Ordering Information DS12R885 DS83C520 ± R/W AS GND X2 X1 VCC VCC CRYSTAL DS VBACKUP SUPER CAP AD(0–7) SQW RESET IRQ RCLR CS MOT Typical Operating Circuit Rev 1; 4/04 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PIN- PACKAGE TOP MARK DS12R885-5 -40°C to +85°C 24 SO (300 mils) DS12R885-5 DS12R885-33 -40°C to +85°C 24 SO (300 mils) DS12R885-33 DS12CR887-5 -40°C to +85°C 24 EDIP (700 mils) DS12CR887-5 DS12CR887-33 -40°C to +85°C 24 EDIP (700 mils) DS12CR887-33 DS12R887-5* -40°C to +85°C 48 BGA DS12R887-5 DS12R887-33* -40°C to +85°C 48 BGA DS12R887-33 Pin Configurations appear at end of data sheet. *Future product—contact factory for availability. |
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