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BQ4285-具有 114x8 NVSRAM 和 NVSRAM 控制的 RTC IC
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BQ4285 - 具有 114x8 NVSRAM 和 NVSRAM 控制的 RTC IC

BQ4285是TI公司(德州仪器)的一款无产品,BQ4285是具有 114x8 NVSRAM 和 NVSRAM 控制的 RTC IC,本站介绍了BQ4285的产品说明、应用、特性等,并给出了与BQ4285相关的TI元器件型号供参考.

BQ4285 - bq4285 - Real-Time Clock (RTC) With NVRAM Control - TI德州仪器(Texas Instruments)

产品描述

The CMOS bq4285 is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. Other features include three maskable interrupt sources, square wave output, and 114 bytes of general nonvolatile storage.

The bq4285 write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains data and operates the clock and calendar.

The bq4285 is a fully compatible real-time clock for IBM AT-compatible computers and other applications. The only external components are a 32.768kHz crystal and a backup battery.

The bq4285 integrates a battery-backup controller to make a standard CMOS SRAM nonvolatile during power-fail conditions. During power-fail, the bq4285 automatically write-protects the external SRAM and provides a VCC output sourced from the clock backup battery.

产品特性

  • Direct clock/calendar replacement for IBM® AT-compatible computers and other applications
  • Functionally compatible with the DS1285
    • Closely matches MC146818A pin configuration
  • 114 bytes of general nonvolatile storage
  • Automatic backup and write-protect control to external SRAM
  • 160 ns cycle time allows fast bus operation
  • Less than 0.5µA load under battery operation
  • 14 bytes for clock/calendar and control
  • Calendar in day of the week, day of the month, months, and years, with automatic leap-year adjustment
  • Time of day in seconds, minutes, and hours
    • 12- or 24-hour format
    • Optional daylight saving adjustment
  • BCD or binary format for clock and calendar data
  • Programmable square wave out-put
  • Three individually maskable interrupt event flags:
    • Periodic rates from 122 us to 500 ms
    • Time-of-day alarm once per second to once per day
    • End-of-clock update cycle
  • 24-pin plastic DIP or SOIC

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