Datasheet > 微控制器和处理器 > 计时器或实时时钟> BQ3285ED

BQ3285ED

更新时间： 2024-10-27 21:53:35

品牌	Logo	应用领域
德州仪器 - TI		时钟
页数	文件大小	规格书
27页	157K
描述
Real-Time Clock (RTC)

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中文翻译

获取价格

数据手册

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BQ3285ED 数据手册

bq3285ED/LD

(

)

Real-Time Clock RTC

Features

The bq3285ED/LD 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.

General Description

➤ ACPI-compliant

The CMOS bq3285ED/LD is a low-

power microprocessor peripheral pro-

viding a time-of-day clock and 100-

year calendar with alarm features

and battery operation. The architec-

ture is based on the bq3285/7 RTC

with added features: low-voltage op-

eration, 32.768kHz output, 128 addi-

tional bytes of CMOS, and a day-of-

month alarm to be compliant with

the ACPI RTC specification.

day-of-month alarm

➤ Direct clock/calendar replace-

ment for IBM^®AT-compatible

computers and other applications

The bq3285ED/LD is a fully com-

patible real-time clock for IBM AT-

compatible computers and other ap-

plications. The only external compo-

nents are a 32.768kHz crystal and a

backup battery.

➤ 2.7–5.5V operation (bq3285LD);

4.5–5.5V operation (bq3285ED)

➤ 242 bytes of general nonvolatile

storage

The bq3285ED is intended for use in

5V systems. The bq3285LD is in-

tended for use in 3V systems; the

bq3285LD, however, may also oper-

ate at 5V and then go into a 3V

power-down state, write-protecting

as if in a 3V system.

➤ Dedicated 32.768kHz output pin

A 32.768kHz output is available for

sustaining power-management ac-

tivities. The bq3285ED/LD 32kHz

output is always on whenever V_CCis

valid. In V_CCstandby mode, the

32kHz is active, and the bq3285LD

t ypica lly dr a ws 100µA wh ile t h e

bq3285ED typically draws 300µA.

Wake-up capability is provided by

an alarm interrupt, which is active

in battery-backup mode. In battery-

backup mode, current drain is less

than 550nA.

➤ System wake-up capability—

alarm interrupt output active in

battery-backup mode

➤ Less than 0.55µA load under bat-

tery operation

➤ Selectable Intel or Motorola bus

timing

➤ 24-pin plastic SSOP

Pin Connections

Pin Names

AD₀–AD₇Multiplexed address/

data input/output

32K

32.768kHz output

EXTRAM Extended RAM enable

MOT

Bus type select input

Chip select input

Address strobe input

Data strobe input

Read/write input

Interrupt request output

Reset input

MOT

32k

EXTRAM

RCL

RAM clear input

3V backup cell input

Crystal inputs

Power supply

Ground

RCL

X1–X2

V_CC

INT

RST

R/W

INT

RST

V_SS

24-Pin SSOP

PN3285ED/LD.eps

July 1997

12 3 4 5 6 7...27

中文翻译

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与BQ3285ED相关器件

型号	品牌	获取价格	描述	数据表
BQ3285EDSS	TI	获取价格	Real-Time Clock (RTC)
BQ3285EDSSTR	TI	获取价格	Real-Time Clock (RTC)
BQ3285EP	TI	获取价格	Real-Time Clock RTC
BQ3285EP	ROCHESTER	获取价格	1 TIMER(S), REAL TIME CLOCK, PDIP24, 0.600 INCH, GREEN, PLASTIC, DIP-24
BQ3285EP-	TI	获取价格	Real-Time Clock RTC
BQ3285EPN	TI	获取价格	Real-Time Clock RTC
BQ3285EQ-	TI	获取价格	Real-Time Clock RTC
BQ3285EQN	TI	获取价格	Real-Time Clock RTC
BQ3285ES	TI	获取价格	Real-Time Clock RTC
BQ3285ES-	TI	获取价格	Real-Time Clock RTC

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