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BQ3285LFSS-A1TR Datasheet(PDF) 1 Page - Texas Instruments |
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BQ3285LFSS-A1TR Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 22 page  1 Features ® ACPI-compliant day-of-month alarm ® Y2K century bit ® Direct clock/calendar replace- ment for IBM ® AT-compatible computers and other applications ® 2 index shadow registers ® 2.7–5.5V operation ® 240 bytes of general nonvolatile storage ® Dedicated 32.768kHz output pin ® System wake-up capability— alarm interrupt output active in battery-backup mode ® Less than 0.55 µA load under bat- tery operation ® Selectable Intel or Motorola bus timing ® 24-pin plastic SSOP General Description The CMOS bq3285LF is a low-power microprocessor peripheral providing a time-of-day clock and 100-year cal- endar with alarm features and bat- tery operation. The architecture is based on the bq3285 RTC with added features: century bit, low-voltage op- eration, 32.768kHz output, 126 addi- tional bytes of CMOS, two shadow registers of last address used, and a day-of-month alarm to be compliant with the ACPI RTC specification. A 32.768kHz output is available for sustaining power-management ac- tivities. The bq3285LF 32kHz out- put is always on whenever VCC is valid. In VCC standby mode, the 32kHz is active, and the bq3285LF typically draws 100 µA. Wake-up ca- pability is provided by an alarm in- terrupt, which is active in battery- backup mode. In battery-backup mode, current drain is less than 550nA. The bq3285LF 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 bq3285LF is a fully compatible real-time clock for IBM AT- compatible computers and other ap- plications. The only external compo- nents are a 32.768kHz crystal and a backup battery. The bq3285LF is intended for use in 3V systems; however, it may also op- erate at 5V and then go into a 3V power-down state, write-protecting as if in a 3V system. Y2K-Enhanced Real-Time Clock (RTC) bq3285LF 1 PN3285ED/LD.eps 24-Pin 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 32k 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 6/99 B 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 32K 32.768kHz output EXTRAM Extended RAM enable RCL RAM clear input BC 3V backup cell input X1–X2 Crystal inputs VCC Supply voltage input VSS Ground |
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