BQ3287MT-SB2

实时时钟RTC模块 Real-Time Clock RTC Module

General Description

The CMOS bq3287/bq3287A 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 gen eral nonvolatile storage.

Features

➤Direct clock/calendar replacement for IBM® AT-compatible computers and other applications

➤Functionally compatible with the DS1287/DS1287A and MC146818A

➤114 bytes of general nonvolatile storage

➤Integral lithium cell and crystal

➤160 ns cycle time allows fast bus operation

➤Selectable Intel or Motorola bus timing

➤14 bytes for clock/calendar and control

➤BCD or binary format for clock and calendar data

➤Time of day in seconds, minutes, and hours

  - 12- or 24-hour format

  - Optional daylight saving adjustment

➤Calendar in day of the week, day of the month, months, and years with automatic leap-year adjust

ment

➤Programmable square wave out put

➤Three individually maskable in terrupt event flags:

  - Periodic rates from 122µs to 500 ms

  - Time-of-day alarm once per second to once per day

  - End-of-clock update cycle

➤Better than one minute per month clock accuracy