Datasheet > 微控制器和处理器 > 计时器或实时时钟> BQ3285ESTR

BQ3285ESTR

更新时间： 2024-10-27 21:54:35

品牌	Logo	应用领域
德州仪器 - TI		时钟
页数	文件大小	规格书
29页	1049K
描述
Real-Time Clock RTC

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中文翻译

获取价格

数据手册
替代型号

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BQ3285ESTR 数据手册

bq3285E/L

Real-Time Clock (RTC)

➤ BCD or binary format for clock

Features

General Description

and calendar data

➤ Direct clock/calendar replace-

ment for IBM^®AT-compatible

computers and other applications

Th e CMOS bq3285E /L is a low-

power m icr opr ocessor per iph er a l

providing a time-of-day clock and

100-year calendar with alarm fea-

t ures a nd ba t t ery opera t ion . Th e

b q3 28 5 L s u p p or t s 3 V s ys t e m s.

Other bq3285E/L features include

three maskable interrupt sources,

square-wave output, and 242 bytes

of general nonvolatile storage.

➤ Calendar in day of the week, day

of the month, months, and years,

with automatic leap-year adjust-

ment

➤ Functionally compatible with the

DS1285

➤ Time of day in seconds, minutes,

and hours

- ^{Closely matches MC146818A}

pin configuration

- ^{12- or 24-hour format}

- ^{Optional daylight saving}

➤ 2.7–3.6V operation (bq3285L);

adjustment

4.5–5.5V operation (bq3285E)

A 32.768kHz output is available for

sustaining power-management ac-

tivities. Wake-up capability is pro-

vided by an alarm interrupt, which

is active in battery-backup mode.

➤ Programmable square wave out-

➤ 242 bytes of general nonvolatile

put

storage

➤ Three individually maskable in-

➤ 32.768kHz output for power man-

terrupt event flags:

agement

- ^{Periodic rates from 122}^µ^{s to}

The bq3285E/L write-protects the

clock, calendar, and storage registers

du r in g power fa ilu r e. A ba cku p

battery then maintains data and oper-

ates the clock and calendar.

➤ System wake-up capability—

alarm interrupt output active in

battery-backup mode

500ms

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

second to once per day

➤ Less than 0.5µA load under bat-

- End-of-clock update cycle

➤ 24-pin plastic DIP, SOIC, or

tery operation

The bq3285E/L is a fully compatible

real-time clock for IBM AT-compatible

computers and other applications.

The only external components are a

32.768kHz crystal and a backup bat-

tery.

➤ Selectable Intel or Motorola bus

SSOP

timing

➤ 14 bytes for clock/calendar and

control

Pin Connections

Pin Names

AD₀–AD₇Multiplexed address/

data input/output

RST

Reset input

SQW

Square wave output

MOT

SQW

EXTRAM

MOT

Bus type select input

Chip select input

Address strobe input

Data strobe input

Read/write input

Interrupt request

output

EXTRAM Extended RAM enable

RCL

RAM clear input

3V backup cell input

Crystal inputs

Power supply

Ground

RCL

INT

RST

X1–X2

V_CC

R/W

INT

17 DS

R/W

V_SS

14 AS

13 CS

24-Pin DIP or SOIC/SSOP

PN3285E1.eps

SLUS004A -DECEMBER 1993 - REVISED MAY 2004

12 3 4 5 6 7...29

中文翻译

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BQ3285ESTR 替代型号

型号	品牌	替代类型	描述	数据表
BQ3287AMT-SB2	TI	完全替代	Real-Time Clock (RTC) Module
BQ3287MT-SB2	TI	完全替代	Real-Time Clock RTC Module
BQ3285ES	TI	完全替代	Real-Time Clock RTC

与BQ3285ESTR相关器件

型号	品牌	获取价格	描述	数据表
BQ3285ESTRG4	TI	获取价格	1 TIMER(S), REAL TIME CLOCK, PDSO24, 0.300 INCH, GREEN, PLASTIC, SOIC-24
BQ3285L	TI	获取价格	Y2K-Enhanced Real-Time Clock (RTC)
BQ3285LC	ETC	获取价格	Real-Time Clock (RTC)
BQ3285LCS	ETC	获取价格	Real-Time Clock
BQ3285LCSS	TI	获取价格	RTC IC With 242x8 NVSRAM Alarm Wake-up Dedicated 32kHz Output, 3V Vcc 24-SSOP
BQ3285LCSS-	TI	获取价格	Real-Time Clock (RTC)
BQ3285LCSSTR	TI	获取价格	RTC IC With 242x8 NVSRAM Alarm Wake-up Dedicated 32kHz Output, 3V Vcc 24-SSOP
BQ3285LD	TI	获取价格	Real-Time Clock (RTC)
BQ3285LDSS	TI	获取价格	Real-Time Clock (RTC)
BQ3285LDSSTR	TI	获取价格	Real-Time Clock (RTC)

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