BQ4285E

更新时间： 2024-09-09 21:53:31

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
32页	1565K
描述
Enhanced RTC With NVRAM Control

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中文翻译

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数据手册

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BQ4285E 数据手册

bq4285E/L

Enhanced RTC With NVRAM Control

➤ BCD or binary format for clock

General Description

and calendar data

Features

➤ Direct clock/calendar replace-

ment for IBM^®AT-compatible

computers and other applications

The CMOS bq4285E/L is a low-power

microprocessor peripheral providing a

time-of-day clock and 100-year calen-

dar with alarm features and battery

operation. Other features include

three maskable interrupt sources,

square wave output, and 114 bytes of

general nonvolatile storage.

➤ Calendar in day of the week, day

of the month, months, and years,

with automatic leap-year adjust-

ment

➤ 114 bytes of general nonvolatile

storage

➤ Time of day in seconds, minutes,

and hours

➤ Enhanced features include:

- ^{12- or 24-hour format}

- ^{System wake-up capability—}

alarm interrupt output active

in battery-backup mode

- ^{Optional daylight saving}

A 32.768kHz output is available for

sustaining power-management activi-

ties. Wake-up capability is provided by

an alarm interrupt, which is active in

battery-backup mode.

adjustment

- ^{2.7–3.6V operation (bq4285L);}

➤ Programmable square wave out-

4.5–5.5V operation (bq4285E)

put

- ^{32kHz output for power}

➤ Three individually maskable in-

The bq4285E/L write-protects the

clock, calendar, and storage registers

during power failure. A backup bat-

tery then maintains data and oper-

ates the clock and calendar.

management

terrupt event flags:

➤ Automatic backup and write-

- Periodic rates from 122µs to

protect control to external SRAM

500ms

➤ Functionally compatible with the

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

DS1285

second to once per day

The bq4285E/L is a fully compatible

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.

- End-of-clock update cycle

➤ 24-pin plastic DIP or SOIC

➤ Less than 0.5 µA load under bat-

tery operation

The bq4285E/L integrates

battery-backup controller to make a

➤ 14 bytes for clock/calendar and

control

Pin Names

Pin Connections

AD₀–AD₇Multiplexed address/data

input/output

MOT

Bus type select input

OUT

SQW

R/W

INT

RST

SQW

X1–X2

Chip select input

Address strobe input

Data strobe input

Read/write input

Interrupt request output

Reset input

Square wave output

3V backup cell input

Crystal inputs

OUT

INT

RST

R/W

No connect

CE_IN

CE_OUT

V_OUT

V_CC

RAM chip enable input

RAM chip enable output

Supply output

28-Pin PLCC: No Longer Available

24-Pin DIP or SOIC

PN428501.eps

+5V supply

SLUS006A - MAY 1994 - REVISED MAY 2004

12 3 4 5 6 7...32

中文翻译

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与BQ4285E相关器件

型号	品牌	获取价格	描述	数据表
BQ4285E_14	TI	获取价格	Enhanced RTC With NVRAM Control
BQ4285EP	TI	获取价格	Enhanced RTC With NVRAM Control
BQ4285EPN	TI	获取价格	暂无描述
BQ4285ES	TI	获取价格	Enhanced RTC With NVRAM Control
BQ4285L	TI	获取价格	Enhanced RTC With NVRAM Control
BQ4285LP	TI	获取价格	Enhanced RTC With NVRAM Control
BQ4285LQ	ETC	获取价格
BQ4285LQN	TI	获取价格	1 TIMER(S), REAL TIME CLOCK, PQCC28, PLASTIC, LCC-28
BQ4285LS	TI	获取价格	Enhanced RTC With NVRAM Control
BQ4285LSN	TI	获取价格	1 TIMER(S), REAL TIME CLOCK, PDSO24, 0.300 INCH, PLASTIC, SOIC-24

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