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
