V3025- Real Time Clocks - Modules

Very Low Power 8-Bit 32kHz RTC Module (with built-in quartz crystal) with Digital Trimming, User RAM and Battery Switch-over - Ultra-Low Power

General Description

The V3025 is a low power CMOS real time clock with an integrated battery switchover. The standby current is typically 2.5µA and the access time is 50ns. The interface is a multiplexed address and data 8 bits bus. The input line A/D handles multiplexing of address and data. There are no busy flags in the V3025, internal time update cycles are invisible to the user’s software. Time data can be read from the V3025 in 12 or 24-hour data formats. An external signal puts the V3025 in standby mode. Even in standby, the V3025 pulls the IRQ pin active low on an internal alarm interrupt. Calendar functions include leap year correction and week number calculation. The V3025 can be synchronized to an external 50 Hz signal or to the nearest second or minute. The integrated battery switch-over supply the real time clock part by VDD as long as VDD is higher than VBAT. When VDD decreases under VBAT, the output /PFO comes active and the real clock is supplied by the battery or the supercap.

Solutions

  • Industrial controllers
  • Alarm systems with periodic wake up
  • PABX and telephone systems
  • Point of sale terminals
  • Automotive electronics
  • Personal Computers

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Features

  • Built-in quartz with digital trimming for frequency tuning and temperature compensation facilities
  • INTEL and MOTOROLA interface compatibility
  • 15ns typical access time at 5.0V
  • 1.2µA typical standby current at 3.0V
  • Wide supply voltage range VDD: 2.0…5.5V
  • Integrated battery switch-over
  • Battery voltage range VBAT: 2.0…4.0V
  • No busy state
  • No external components required
  • BCD format
  • Frequency measurements
  • Time set lock mode
  • Week number calculation
  • Clock counts up to 99 years
  • Leap year correction
  • 12 or 24 hour data format
  • Output programmable interrupts
  • Alarm interrupt, programmable up to one month
  • Timer interrupt, programmable up to 24 hours
  • Time to 1/100 of a second
  • To external time reference synchronization
  • 50 Hz or nearest s/min synchronization
  • Power fail input /PFI
  • Power fail output or Reset output PFO
  • Tri-state bus capability when power fail (/PFI = 0)
  • User RAM
  • Temperature range - 40 to +85°C
  • Package SO28