Datasheet > BQ4285LQ

BQ4285LQ

更新时间： 2024-11-10 23:35:35

品牌	Logo	应用领域
其他 - ETC		外围集成电路时钟
页数	文件大小	规格书
28页	1445K
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中文翻译

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数据手册

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BQ4285LQ 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

➤ Selectable Intel or Motorola bus

timing (PLCC), Intel bus timing

(DIP and SOIC)

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

(PLCC only )

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

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

24-Pin DIP or SOIC

PN428501.eps

PN428502.eps

+5V supply

Jan. 1999 B

12 3 4 5 6 7...28

中文翻译

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与BQ4285LQ相关器件

型号	品牌	获取价格	描述	数据表
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
BQ4285LSNTR	TI	获取价格	IC 1 TIMER(S), REAL TIME CLOCK, PDSO24, 0.300 INCH, PLASTIC, SOIC-24, Timer or RTC
BQ4285LSTR	TI	获取价格	Enhanced RTC With NVRAM Control
BQ4285P-	TI	获取价格	Real-Time Clock RTC With NVRAM Control
BQ4285P-SB2	TI	获取价格	Real-Time Clock RTC With NVRAM Control
BQ4285Q	TI	获取价格	1 TIMER(S), REAL TIME CLOCK, PQCC28
BQ4285Q-	TI	获取价格	Real-Time Clock RTC With NVRAM Control
BQ4285S-	TI	获取价格	Real-Time Clock RTC With NVRAM Control

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