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BQ3285LP- Datasheet(PDF) 1 Page - Texas Instruments |
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BQ3285LP- Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 29 page  Features ® Direct clock/calendar replace- ment for IBM ® AT-compatible computers and other applications ® Functionally compatible with the DS1285 - Closely matches MC146818A pin configuration ® 2.7–3.6V operation (bq3285L); 4.5–5.5V operation (bq3285E) ® 242 bytes of general nonvolatile storage ® 32.768kHz output for power man- agement ® System wake-up capability— alarm interrupt output active in battery-backup mode ® Less than 0.5 µA load under bat- tery operation ® Selectable Intel or Motorola bus timing ® 14 bytes for clock/calendar and control ® 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 adjust- ment ® Time of day in seconds, minutes, and hours - 12- or 24-hour format - Optional daylight saving adjustment ® Programmable square wave out- put ® Three individually maskable in- terrupt event flags: - Periodic rates from 122µs to 500ms - Time-of-day alarm once per second to once per day - End-of-clock update cycle ® 24-pin plastic DIP, SOIC, or SSOP General Description The CMOS bq3285E/L is a low- power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm fea- tures and battery operation. The bq3285L supports 3V systems. Other bq3285E/L features include three maskable interrupt sources, square-wave output, and 242 bytes of general nonvolatile storage. A 32.768kHz output is available for sustaining power-management ac- tivities. Wake-up capability is pro- vided by an alarm interrupt, which is active in battery-backup mode. The bq3285E/L write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains data and oper- ates the clock and calendar. The bq3285E/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 backup bat- tery. 1 SLUS004A -DECEMBER 1993 - REVISED MAY 2004 bq3285E/L Real-Time Clock (RTC) AD0–AD7 Multiplexed address/ data input/output MOT Bus type select input CS Chip select input AS Address strobe input DS Data strobe input R/W Read/write input INT Interrupt request output RST Reset input SQW Square wave output EXTRAM Extended RAM enable RCL RAM clear input BC 3V backup cell input X1–X2 Crystal inputs VCC Power supply VSS Ground 1 PN3285E1.eps 24-Pin DIP or SOIC/SSOP 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 9 10 16 15 11 12 14 13 VCC SQW EXTRAM BC INT RST DS VSS R/W AS CS MOT X1 X2 AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 VSS RCL Pin Connections Pin Names |
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