Datasheet > 1338

1338

更新时间： 2023-12-20 18:46:33

品牌	Logo	应用领域
瑞萨 - RENESAS		电池
页数	文件大小	规格书
24页	1033K
描述
Real-Time Clock With Battery Backed Non-Volatile RAM

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1338 数据手册

Real-Time Clock with Battery

Backed Non-Volatile RAM

1338

Datasheet

Description

Features

The 1338 is a serial real-time clock (RTC) device that

consumes ultra-low power and provides a full binary-coded

decimal (BCD) clock/calendar with 56 bytes of battery

backed Non-Volatile Static RAM. The clock/calendar

provides seconds, minutes, hours, day, date, month, and

year information. The clock operates in either the 24-hour

or 12-hour format with AM/PM indicator. The end of the

month date is automatically adjusted for months with fewer

than 31 days, including corrections for leap year. Access to

the clock/calendar registers is provided by an I²C interface

capable of operating in fast I²C mode. Built-in Power-sense

circuitry detects power failures and automatically switches

to the backup supply, maintaining time and date operation.

• Real-Time Clock (RTC) counts seconds, minutes, hours,

day, date, month, and year with leap-year compensation

valid up to 2100

• 56-byte battery-backed Non-Volatile RAM for data

storage

• Fast mode I²C serial interface

• Automatic power-fail detect and switch circuitry

• Programmable square-wave output

• Packaged in 8-pin MSOP, 8-pin SOIC, or 16-pin SOIC

(surface-mount package with an integrated crystal)

• Industrial temperature range (-40°C to +85°C)

Typical Applications

• Telecom (Routers, Switches, Servers)

• Handheld (GPS, Point of Sale POS Terminals)

• Consumer Electronics (Set-Top Box, Digital Recording,

Network Applications, Digital Photo Frames)

• Office (Fax/Printers, Copiers)

• Medical (Glucometer, Medicine Dispensers)

• Other (Thermostats, Vending Machines, Modems, Utility

Meters)

Block Diagram

Crystal inside package

for 16-pin SOIC ONLY

1Hz / 4.096kHz /

8.192kHz / 32.768kHz

32.768kHz

Oscillator and

Divider

MUX/

Buffer

SQW/OUT

VCC

GND

V_BAT

Power

Control

Logic

Clock, Calendar

Counter

SCL

SDA

I²C

Interface

56 Byte

RAM

1 Byte 7 Bytes

Control

Buffer

February 3, 2023

12 3 4 5 6 7...24

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