Features: Direct clock/calendar replace-ent for IBM AT-compatible computers and other applications 2.75.5V operation (bq3285LC);4.55.5V operation (bq3285EC) 242 bytes of general nonvolatile storage Dedicated 32.768kHz output pin System wake-up capability-alarm interrupt output active in battery-ba...
bq3285EC: Features: Direct clock/calendar replace-ent for IBM AT-compatible computers and other applications 2.75.5V operation (bq3285LC);4.55.5V operation (bq3285EC) 242 bytes of general nonvolatile storage ...
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Symbol | Parameter | Value | Unit | Conditions |
VCC | DC voltage applied on VCC relative to VSS | -0.3 to 7.0 | V | |
VT | DC voltage applied on any pin excluding VCC relative to VSS |
-0.3 to 7.0 | V | VT VCC + 0.3 |
TOPR | Operatingtemperature | 0 to +70 | °C | Commercial |
TSTG | Storage temperature | -55 to +125 | °C | |
TBIAS | Temperature under bias | -40 to +85 | °C | |
TSOLDER | Soldering temperature | 260 | °C | For 10 seconds |
The CMOS bq3285EC/LC is a lowpower microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. The architecture is based on the bq3285/7 RTC with added features: low-voltage operation, 32.768kHz output, and an extra128bytesofCMOS.
A 32.768kHz output is available for sustaining power-management activities. The bq3285EC 32kHz out-put is always on whenever VCC is valid. For the bq3285LC, the output is on when the oscillator is turned on. In VCC standby mode, the 32kHz is active, and the bq3285LC typically draws 100A while the bq3285EC typically draws 300A. Wake-up capability is provided by an alarm interrupt, which is activein battery-backup mode. In battery
backup mode, current drain is less than 500nA.
The bq3285EC/LC 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 bq3285EC/LC 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 bq3285EC is intended for use in 5V systems. The bq3285LC is intended for use in 3V systems; the bq3285LC, however, may also operate at 5V and then go into a 3V power-down state, write-protecting asifina3Vsystem.