FEATURES
Real-Time Clock Counts Seconds Through
Centuries in BCD Format
– bq4802Y: 5-V Operation
– bq4802LY: 3.3-V Operation
On-Chip Battery-Backup Switchover Circuit
With Nonvolatile Control for External SRAM
Less Than 500 nA of Clock Operation Current
in Backup Mode
Microprocessor Reset With Push-Button
Override
Independent Watchdog Timer With
Programmable Time-Out Period
Power-Fail Interrupt Warning
Programmable Clock Alarm Interrupt Active
in Battery-Backup Mode
Programmable Periodic Interrupt
Battery-Low Warning
28-pin SOIC, TSSOP, and SNAPHAT Package
Options

APPLICATIONS
Telecommunications Base Stations
Servers
Handheld Data Collection Equipment
Medical Equipment
Handheld Instrumentation
Test Equipment

DESCRIPTION
The bq4802Y/bq4802LY real-time clock is a low-power
microprocessor peripheral that integrates a time-ofday
clock, a century-based calendar, and a CPU supervisor,
with package options including a 28-pin SOIC,
TSSOP, or SNAPHAT that requires the bq48SH-28x6
to complete the two-piece module. The bq4802Y/
bq4802LY is ideal for fax machines, copiers, industrial
control systems, point-of-sale terminals, data loggers,
and computers.