Datasheet > 微控制器和处理器 > 计时器或实时时钟> BQ3285S

BQ3285S

更新时间： 2024-11-28 23:35:35

品牌	Logo	应用领域
德州仪器 - TI		外围集成电路光电二极管时钟
页数	文件大小	规格书
22页	554K
描述
Real-Time Clock

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中文翻译

获取价格

数据手册

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BQ3285S 数据手册

bq3285

Real-Time Clock (RTC)

General Description

Features

➤ Calendar in day of the week, day

of the month, months, and years,

with automatic leap-year adjust-

ment

➤ Direct clock/calendar replace-

ment for IBM^®AT-compatible

computers and other applications

The CMOS bq3285 is a low-power

microprocessor peripheral providing

a time-of-day clock and 100-year cal-

endar with alarm features and bat-

tery operation. Other features in-

clude three maskable interrupt

sources, square wave output, and 114

bytes of general nonvolatile storage.

➤ Time of day in seconds, minutes,

➤ Functionally compatible with the

and hours

DS1285

- ^{12- or 24-hour format}

- ^{Optional daylight saving}

- ^{Closely matches MC146818A}

pin configuration

adjustment

The bq3285 write-protects the clock,

calendar, and storage registers during

power failure. A backup battery

then maintains data and operates the

clock and calendar.

➤ 114 bytes of general nonvolatile

➤ Programmable square wave out-

storage

put

➤ 160ns cycle time allows fast bus

➤ Three individually maskable in-

operation

terrupt event flags:

➤ Selectable Intel or Motorola bus

- ^{Periodic rates from 122}^µ^{s to}

The bq3285 is a fully compatible

real-time clock for IBM AT com-

patible computers and other appli-

cations. The only external compo-

nents are a 32.768kHz crystal and

a backup battery

timing

500ms

➤ Less than 0.5µA load under bat-

- ^{Time-of-day alarm once per}

tery operation

second to once per day

- End-of-clock update cycle

➤ 24-pin plastic DIP or SOIC

➤ 14 bytes for clock/calendar and

control

➤ BCD or binary format for clock

and calendar data

Pin Names

Pin Connections

AD₀–AD₇

Multiplexed address/data

input/output

MOT

Bus type select input

Chip select input

Address strobe input

Data strobe input

Read/write input

MOT

SQW

RCL

R/W

INT

RST

Interrupt request

output

INT

RST

SQW

RCL

Reset input

R/W

Square wave output

RAM clear input

3V backup cell input

Crystal inputs

No connect

R/W

X1–X2

28-Pin PLCC

PN328501.eps

24-Pin DIP or SOIC

PN328501.eps

V_CC

V_SS

+5V supply

Ground

Jan. 1999 E

12 3 4 5 6 7...22

中文翻译

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与BQ3285S相关器件

型号	品牌	获取价格	描述	数据表
BQ3285S-	TI	获取价格	Real-Time Clock RTC
BQ3285S-SB2	TI	获取价格	具有 114x8 NVSRAM 的 RTC IC \| DW \| 24 \| 0 to 70
BQ3285S-SB2G4	TI	获取价格	1 TIMER(S), REAL TIME CLOCK, PDSO24, 0.300 INCH, GREEN, SOIC-24
BQ3285S-SB2TR	TI	获取价格	RTC IC with 114x8 NVSRAM 24-SOIC 0 to 70
BQ3287	TI	获取价格	Real-Time Clock RTC Module
BQ3287A	TI	获取价格	RTC Module With 114x8 NVSRAM. RAM Clear Input on A Version
BQ3287A-I	TI	获取价格	1 TIMER(S), REAL TIME CLOCK, PDIP24, T TYPE MODULE, DIP-24
BQ3287AMT	TI	获取价格	暂无描述
BQ3287AMT-	TI	获取价格	Real-Time Clock RTC Module
BQ3287AMTI	ETC	获取价格	Real-Time Clock (RTC) Module

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