BQ4847MT Datasheet PDF - TI

General Description

●The bq4847 Real-Time Clock Module is a low-power microprocessor peripheral that integrates a time of-day clock, a100-year calendar, a CPU supervisor, a battery, and a crystal in a 28-pin DIP module. The part is ideal for fax machines, copiers, in dustrial control systems, point-of-sale terminals, data loggers, and computers.

●Features

●➤Real-Time Clock counts seconds through years in BCD format

●➤Integrated battery and crystal

●➤On-chip battery-backup switch over circuit with nonvolatile control for an external SRAM

●➤130mAh battery capacity

●➤±1 minute per month clock accuracy

●➤Less than 500nA of clock operation current in backup mode

●➤Microprocessor reset valid to VCC=VSS

●➤Independent watchdog timer with a programmable time-out period

●➤Power-fail interrupt warning

●➤Programmable clock alarm interrupt active in battery-backup mode

●➤Programmable periodic interrupt

●➤Battery-low warning