BQ4802YDSH屬于集成電路（IC）的實時時鐘。由美國德州儀器公司制造生產(chǎn)的BQ4802YDSH實時時鐘實時時鐘 (RTC) 為幾乎所有需要保持精確時間的電子設(shè)備提供時間和/或日期信息。時鐘類型有二進制計數(shù)器、時鐘/日歷/監(jiān)控器、歷時計時器、幻時鐘芯片、便攜式系統(tǒng)控制器、溫度記錄器、時間事件記錄器和計時器時鐘外設(shè)。其包含 2 B 至 2 MB 不等的存儲器，接口選項有 I2C、并行、串行、SPI、1 線式、2 線式、3 線式和 4 線式。

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.