_Module_image1_1531164098.png "Santest Co BQ3287")
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Santest Co BQ3287 overview
BQ3287 is a Real-Time clock module made by Santest Co. Benchmarq BQ3287 Real-Time Clock (RTC) Module.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…
Product details
Manufactured bySantest Co
Product typeReal-Time Clock Module
DescriptionBenchmarq BQ3287 Real-Time Clock (RTC) Module.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, squarewave output, and 114 bytes of general nonvolatile storage. The bq3287A version is identical to the bq3287, with the addition of the RAM clear input.The bq3287 is a fully compatible real-time c lock for IBM AT compatible computers and other applications. The bq3287 write protects the clock, calendar, and storage registers during power failure. The integral backup energy source then maintains data and operates the clock and calendar.As shipped from Benchmarq, the real time clock is turned off to maximize battery capacity for in-system operation.The bq3287 is functionally equivalent to the bq3285, except that the battery (16, 20) and crystal (2, 3) pins are not accessible. These pins are connected internally to a coin cell and quartz crystal. The coin cell is sized to provide 10 years of data retention and clock operation in the absence of power. For a complete description of features, operating conditions, electrical characteristics, bus timing, and pin descriptions, see the bq3285 data sheet.
Key FeaturesDirect 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 adjustment Programmable square wave output Three individually maskable interrupt event flags:- Periodic rates from 122 μs 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
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Manufactured by
Santest Co
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Product type
Real-Time Clock Module
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