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bq4285E

Features: *Direct clock/calendar replace-ment for IBM AT-compatible computers and other applications *114 bytes of general nonvolatile storage *Enhanced features include: - System wake-up capability-alarm interrupt output active in battery-backup mode - 2.73.6V operation (bq4285L);4.55.5V operatio...

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SeekIC No. : 004301328 Detail

bq4285E: Features: *Direct clock/calendar replace-ment for IBM AT-compatible computers and other applications *114 bytes of general nonvolatile storage *Enhanced features include: - System wake-up capability...

bq4285E Data Sheet

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Part Number:
bq4285E
Supply Ability:
5000

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  • 1~5000
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  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

*Direct clock/calendar replace-ment for IBM AT-compatible computers and other applications
*114 bytes of general nonvolatile storage
*Enhanced features include:
   - System wake-up capability-alarm interrupt output active in battery-backup mode
   - 2.73.6V operation (bq4285L);4.55.5V operation (bq4285E)
   - 32kHz output for power management
*Automatic backup and write-protect control to external SRAM
*Functionally compatible with the DS1285
*Less than 0.5A load under bat-tery operation
*BCD or binary format for clock and calendar data
*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
*Programmable square wave output Three individually maskable interrupt event flags:
   -Periodic rates from 122s to 500ms
   - Time-of-day alarm once per second to once per day
*End-of-clock update cycle
   - 24-pin plastic DIP or SOIC


Pinout

Connection Diagram


Specifications

Symbol Parameter Value Unit Notes
VCC VCC relative to VSS -0.3 to 7.0 V
VT DC voltage applied on any pin ex-
cluding VCC relative to VSS 		 -0.3 to 7.0 V  VT VCC + 0.3
TOPR Operating ambient temperature 0 to +70 °C Commercial
-40 to +85 °C Industrial "N"
TSTG Storage temperature -55 to +125 °C  
TBIAS Temperature under bias -40 to +85 °C  
TSOLDER Soldering temperature  260 °C For10seconds



Description

The CMOS bq4285E/L is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calen-dar with alarm features and battery operation. Other features include three maskable interrupt sources, square wave output,and 114 bytes of generalnonvolatilestorage.


A 32.768kHz output of bq4285E is available for sustaining power-management activi-ties. Wake-up capability is provided by an alarm interrupt, which is active in battery-backupmode.


The bq4285E/L write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains data and operatestheclockandcalendar.


The bq4285E/L 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 backupbattery.


The bq4285E/L integrates a battery-backupcontrollertomakea.




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